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<!ENTITY legal SYSTEM "legal.xml">
<!ENTITY appversion "5.5.37">
<!ENTITY manrevision "2.9">
<!ENTITY date "March 2005">
<!ENTITY app "<application>gcalctool</application>">
<!ENTITY appname "Calculator">
<!ENTITY ldquo "&#147;">
<!-- Left Double Quote --><!ENTITY rdquo "&#148;">
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<article id="index" lang="oc">
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  <articleinfo> 
    <title>Manual de <application>gcalctool</application></title>       

    <abstract role="description">
      <para>
      gcalctool is a calculator for GNOME. It includes basic, advanced, 
      financial, and scientific modes and uses a multiple precision package 
      to do its arithmetic to give a high degree of accuracy.
      </para>
    </abstract>

    <copyright> 
      <year>2003</year> 
      <year>2004</year> 
      <year>2005</year>
      <holder>Sun Microsystems</holder> 
    </copyright> 
<!-- translators: uncomment this:

  <copyright>
   <year>2003</year>
   <holder>ME-THE-TRANSLATOR (Latin translation)</holder>
  </copyright>

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    <publisher role="maintainer"> 
      <publishername>Projècte de documentacion de GNOME</publishername> 
    </publisher> 

     <legalnotice id="legalnotice">
	<para>
	  Permission is granted to copy, distribute and/or modify this
	  document under the terms of the GNU Free Documentation
	  License (GFDL), Version 1.1 or any later version published
	  by the Free Software Foundation with no Invariant Sections,
	  no Front-Cover Texts, and no Back-Cover Texts.  You can find
	  a copy of the GFDL at this <ulink type="help" url="ghelp:fdl">link</ulink> or in the file COPYING-DOCS
	  distributed with this manual.
         </para>
         <para> This manual is part of a collection of GNOME manuals
          distributed under the GFDL.  If you want to distribute this
          manual separately from the collection, you can do so by
          adding a copy of the license to the manual, as described in
          section 6 of the license.
	</para>

	<para>
	  Many of the names used by companies to distinguish their
	  products and services are claimed as trademarks. Where those
	  names appear in any GNOME documentation, and the members of
	  the GNOME Documentation Project are made aware of those
	  trademarks, then the names are in capital letters or initial
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	<para>
	  DOCUMENT AND MODIFIED VERSIONS OF THE DOCUMENT ARE PROVIDED
	  UNDER  THE TERMS OF THE GNU FREE DOCUMENTATION LICENSE
	  WITH THE FURTHER UNDERSTANDING THAT:

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		  <para>DOCUMENT IS PROVIDED ON AN "AS IS" BASIS,
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                    OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
                    LICENSE. NO USE OF ANY DOCUMENT OR MODIFIED
                    VERSION OF THE DOCUMENT IS AUTHORIZED HEREUNDER
                    EXCEPT UNDER THIS DISCLAIMER; AND
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		  <para>UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL
                       THEORY, WHETHER IN TORT (INCLUDING NEGLIGENCE),
                       CONTRACT, OR OTHERWISE, SHALL THE AUTHOR,
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  </legalnotice>


   <!-- This file  contains link to license for the documentation (GNU FDL), and 
        other legal stuff such as "NO WARRANTY" statement. Please do not change 
        any of this. -->

    <authorgroup> 
      <corpauthor>Sun Microsystems Inc.</corpauthor>

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      <othercredit role="translator">
                <firstname>Latin</firstname> 
                <surname>Translator 1</surname> 
                <affiliation> 
                          <orgname>Latin Translation Team</orgname> 
                          <address> <email>translator@gnome.org</email> </address> 
                </affiliation>
                <contrib>Latin translation</contrib>
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    </authorgroup>

    <revhistory>
    <revision> 
                <revnumber>Calculator Manual V2.9</revnumber> 
                <date>Març de 2005</date> 
                <revdescription> 
                          <para role="author">Sun Java Desktop System Documentation Team
                          </para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>Calculator Manual V2.8</revnumber> 
                <date>Agost de 2004</date> 
                <revdescription> 
                          <para role="author">Sun Java Desktop System Documentation Team
                          </para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.7</revnumber> 
                <date>Febrièr de 2004</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.6</revnumber> 
                <date>Octòbre de 2003</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.5</revnumber> 
                <date>Julhet de 2003</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.4</revnumber> 
                <date>Junh de 2003</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.3</revnumber> 
                <date>Abril de 2003</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.2</revnumber> 
                <date>Abril de 2003</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.1</revnumber> 
                <date>Març de 2003</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.0</revnumber> 
                <date>Març de 2003</date> 
                <revdescription> 
                          <para role="author">Còla Sun de documentacion de GNOME</para>
                          <para role="publisher">Projècte de documentacion de GNOME</para>
                </revdescription> 
      </revision> 
    </revhistory> 

    <releaseinfo>This manual describes version 5.5.37 of Calculator.
    </releaseinfo> 
    <legalnotice> 
      <title>Feedback</title> 
      <para>To report a bug or make a suggestion regarding the <application>gcalctool</application> application or this manual, follow the directions in the <ulink url="ghelp:gnome-feedback" type="help">GNOME Feedback Page</ulink>. 
      </para>
<!-- Translators may also add here feedback address for translations -->
    </legalnotice> 
  </articleinfo> 

  <indexterm zone="index"> 
    <primary>gcalctool</primary> 
  </indexterm> 
  <indexterm zone="index"> 
    <primary>Calculeta</primary> 
  </indexterm>

<!-- ============= Document Body ============================= -->
<!-- ============= Introduction ============================== -->
  <sect1 id="gcalctool-intro"> 
    <title>Introduccion</title> 
    <para>The <application>gcalctool</application> application provides the following modes for different types of mathematical functionality: </para>
     <variablelist>
        <varlistentry>
        <term><link linkend="gcalctool-basic-mode">Basic</link></term>
        <listitem><para>The default mode. Provides standard calculator functions. You can perform standard addition, subtraction, division, and multiplication functions in Basic mode and you can use all of the Basic functions in each of the other modes.</para></listitem>
        </varlistentry>
  <varlistentry>
        <term><link linkend="gcalctool-advanced-mode">A_vançat</link></term>
        <listitem><para>Provides advanced calculator functions. You can store numbers in 10 different memory registers, and easily retrieve and replace the numbers in the memory registers. You can use all of the Advanced functions in Financial, Scientific and Programming modes.</para></listitem>
        </varlistentry>
        <varlistentry>
        <term><link linkend="gcalctool-financial-mode">Financièr</link></term>
        <listitem><para>Provides several complex financial functions.</para></listitem>
        </varlistentry>
        <varlistentry>
        <term><link linkend="gcalctool-scientific-mode">Scientific</link></term>
        <listitem><para>Provides many additional mathematical functions, including trigonometric functions. You can also store your own functions and constants, when you use Scientific mode.</para></listitem>
        </varlistentry>
                <varlistentry>
                <term><link linkend="gcalctool-programming-mode">Programming </link></term>
                <listitem><para>Provides functions useful to a programmer, including bitwise functions and a bit editor.</para></listitem>
                </varlistentry>
     </variablelist>

    <para>You can use <application>gcalctool</application> in the following numbering systems:</para>
      <informaltable frame="all">
        <tgroup cols="2" colsep="1" rowsep="1">
          <colspec colname="COLSPEC0" colwidth="50*"/>
          <colspec colname="COLSPEC1" colwidth="50*"/>
          <thead>
            <row valign="top">
              <entry colname="COLSPEC0">
                <para>Numbering System</para></entry>
              <entry colname="COLSPEC1" align="right">
                <para>Basa</para></entry>
            </row>
          </thead> 
          <tbody> 
            <row valign="top">
              <entry><para>Binari</para></entry>
              <entry align="right"><para>2</para></entry>
            </row>
            <row valign="top">
              <entry><para>Octal</para></entry>
              <entry align="right"><para>8</para></entry>
            </row>
            <row valign="top">
              <entry><para>Decimal</para></entry>
              <entry align="right"><para>10</para></entry>
            </row>
            <row valign="top">
              <entry><para>Hexadecimal</para></entry>
              <entry align="right"><para>16</para></entry>
            </row>
          </tbody> 
        </tgroup>
      </informaltable>
                           
  </sect1>

<!-- =========== Getting Started ============================== -->

  <sect1 id="gcalctool-get-start"> 
    <title>Per començar</title> 
    <para>You can start <application>gcalctool</application> in the following ways:</para>
    <variablelist>
      <varlistentry>
        <term>Menut</term>
        <listitem>
          <para>
            Choose <menuchoice><guimenu>Accessories</guimenu><guimenuitem>Calculator</guimenuitem></menuchoice>.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>Linha de comanda</term>
        <listitem>
          <para>
            Execute the following command: <userinput>gnome-calculator</userinput></para>
        </listitem>
      </varlistentry>
    </variablelist>
    <para>When you start <application>gcalctool</application>, the following window is displayed:</para>

    <!-- ==== Figure ==== -->
      <figure id="gcalctool-FIG-basic"> 
        <title><application>gcalctool</application> Basic Mode Window</title> 
        <screenshot> 
          <mediaobject> 
            <imageobject><imagedata fileref="figures/gcalctool_basic_window.png" format="PNG"/> 
            </imageobject>
            <textobject> 
              <phrase>Shows <application>gcalctool</application> Basic mode window.  </phrase> 
            </textobject> 
          </mediaobject> 
        </screenshot> 
      </figure>
    <!-- ==== End of Figure ==== -->
                <para>The <application>gcalctool</application> window contains the following elements: </para>
                <variablelist>
                  <varlistentry> <term>Barra de menuts</term>
                         <listitem>
                                <para>The menus on the menubar contain all of the commands that you need to work with <application>gcalctool</application>.</para>
                         </listitem>
                  </varlistentry>
                  <varlistentry> <term>Display area</term>
                         <listitem>
                                <para>The display area shows the numbers that you enter, and the results of calculations.</para>
                         </listitem>
                  </varlistentry>
                  <varlistentry> <term>Mode area</term>
                         <listitem>
                                <para>The mode area displays the buttons for the current mode. The Basic mode buttons are always displayed. Advanced mode buttons are also available in Financial, Scientific and Programming modes.  </para>
                         </listitem>
                  </varlistentry>
                  <varlistentry> <term>Popup Menu</term>
                         <listitem>
                <para>The <inlinemediaobject><imageobject><imagedata fileref="figures/gcalctool_menu_symbol.png" format="PNG"/></imageobject><textobject><phrase>Shows popup-menu symbol.</phrase></textobject></inlinemediaobject> symbol on a <application>gcalctool</application> button indicates that a popup menu is displayed when you click on that button.</para>
                         </listitem>
                  </varlistentry>
<varlistentry>
         <term>Barra d'estat</term>
                         <listitem>
                                <para>The status bar displays messages on the status of your calculations.  </para>
                         </listitem>
                  </varlistentry>
                </variablelist>
  </sect1>
<!-- ================ Usage ================================ -->
  <sect1 id="gcalctool-usage"> 
    <title>Utilizacion</title> 

    <!-- ================ Usage Subsection ================================ -->
    <sect2 id="gcalctool-calc-functions">
                <title>To Use Calculator Functions</title> 
                <para>To perform a calculation, use one of the following methods:</para>
                <itemizedlist>
                  <listitem>
                         <para>Click on the <application>gcalctool</application> buttons to enter numbers and functions.</para>
                  </listitem>
                  <listitem>
                         <para>Give focus to the <application>gcalctool</application> window, then use the keyboard or numeric keypad to specify the calculation that you want to perform. For a complete list of keyboard shortcuts, see <xref linkend="gcalctool-keyboard-shortcut"/>.</para>
                  </listitem>
                </itemizedlist>
                <para>The <application>gcalctool</application> application automatically displays numbers with more than 40 digits, and small numbers, as exponential numbers. For example, the following table shows the value that is displayed when you use the decimal numeric base with an accuracy of 2 significant places: </para>
      <informaltable frame="all">
        <tgroup cols="2" colsep="1" rowsep="1">
          <colspec colname="COLSPEC0" colwidth="50*"/>
          <colspec colname="COLSPEC1" colwidth="50*"/>
          <thead>
            <row valign="top">
              <entry colname="COLSPEC0">
                <para>Visualizar</para></entry>
              <entry colname="COLSPEC1">
                <para>Signifies</para></entry>
            </row>
          </thead>
          <tbody>
            <row valign="top">
              <entry><para>1.23e+37</para></entry>
              <entry><para>1.23 * 10<superscript>37</superscript></para></entry>
            </row>
            <row valign="top">
              <entry><para>1e-5</para></entry>
              <entry><para>0,00001</para></entry>
            </row>
          </tbody>
        </tgroup>
      </informaltable>

      <para>For information about how to enter a number in exponential format, see <xref linkend="gcalctool-enter-exp"/>.</para>

    <sect3 id="gcalctool-calc-functions-separator">
                <title>To Display a Separator in Large Numbers</title> 
      <para>To insert a separator between every three digits to the left of the numeric point in decimal base, choose <menuchoice><guimenu>View</guimenu><guimenuitem>Show Thousands Separator</guimenuitem></menuchoice>. 
</para>
      <note>
      <para>Different countries and cultures have varying conventions for how to communicate. These conventions include the language spoken and the character used as a numeric separator.</para>
      <para><application>gcalctool</application> has been internationalized so users can adapt to their own conventions. This is done by setting a specific locale. We can't determine what locales will exist, except for a standard one called the C locale.</para>
      <para>When you use the C locale, the separator character is not displayed.</para>
      </note>
    </sect3>

    <sect3 id="gcalctool-calc-functions-copy">
                <title>To Copy and Paste in the Display Area</title> 
                <para>To copy the result of a calculation, choose <menuchoice><guimenu>Edit</guimenu><guimenuitem>Copy</guimenuitem></menuchoice>. You can paste the value into another application.</para>

                <para>To paste a previously copied value into the display area, choose <menuchoice><guimenu>Edit</guimenu><guimenuitem>Paste</guimenuitem></menuchoice>.  </para>
    </sect3>

    </sect2> 
    <!-- ================ Usage Subsection ================================ -->
   
    <sect2 id="gcalctool-basic-mode"> 
      <title>To Perform Basic Calculations</title> 
      <para>Basic mode is displayed by default when you first start <application>gcalctool</application>. To explicitly invoke Basic mode, choose <menuchoice><guimenu>View</guimenu><guimenuitem>Basic</guimenuitem></menuchoice>.  </para>
      <para>The calculator memory registers are unavailable in Basic Mode. In other words, <menuchoice><guimenu>View</guimenu><guimenuitem>Memory Registers</guimenuitem></menuchoice> is inactive.</para>
    <sect3 id="gcalctool-simple-calc"> 
      <title>To Perform Simple Calculations</title> 
      <para>To perform simple calculations, use the buttons described in <xref linkend="gcalctool-TBL-simple-calc"/>. </para>
                <table id="gcalctool-TBL-simple-calc" frame="all">
                  <title>Performing Simple Calculations</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Numerals</para> </entry>
                             <entry><para><guibutton>0</guibutton> to <guibutton>9</guibutton> inclusive</para></entry>
                             <entry><para>In decimal and hexadecimal base, all numerals are available. In octal base, <guibutton>8</guibutton> and <guibutton>9</guibutton> are unavailable. In binary base, only <guibutton>0</guibutton> and <guibutton>1</guibutton> are available. The default base is decimal.</para></entry>
                             <entry><para><guibutton>1</guibutton></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Numeric point</para> </entry>
                             <entry><para><guibutton>.</guibutton></para></entry>
                             <entry><para>Starts the fractional part of a numeric entry.</para></entry>
                             <entry><para><guibutton>1</guibutton> <guibutton>.</guibutton> <guibutton>2</guibutton></para></entry>
                             <entry><para>1,2</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Calculate a result</para> </entry>
                             <entry><para><guibutton>=</guibutton></para></entry>
                             <entry><para>Displays the result of the current calculation in the current base.</para></entry>
                             <entry><para>1 <guibutton>+</guibutton> <guibutton>2</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>3</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Adicion</para> </entry>
                             <entry><para><guibutton>+</guibutton></para></entry>
                             <entry><para>Adds the current value in the display area to the next number that you enter.</para></entry>
                             <entry><para>1 <guibutton>+</guibutton> <guibutton>2</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>3</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Sostraccion</para> </entry>
                             <entry><para><guibutton>-</guibutton></para></entry>
                             <entry><para>Subtracts from the current value in the display area the next number that you enter.</para></entry>
                             <entry><para>3 <guibutton>-</guibutton> <guibutton>2</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Multiplicacion</para> </entry>
                             <entry><para><guibutton>*</guibutton></para></entry>
                             <entry><para>Multiplies the current value in the display area by the next number that you enter.</para></entry>
                             <entry><para>3 <guibutton>*</guibutton> <guibutton>2</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>6</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Division</para> </entry>
                             <entry><para><guibutton>/</guibutton></para></entry>
                             <entry><para>Divides the current value in the display area by the next number that you enter.</para></entry>
                             <entry><para>6 <guibutton>/</guibutton> <guibutton>3</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>2</para></entry>
                           </row>
                        <row valign="top">
                             <entry><para>Change the arithmetic sign</para> </entry>
                             <entry><para><guibutton>+/-</guibutton></para></entry>
                             <entry><para>Changes a positive number to a negative number, or a negative number to a positive number.</para></entry>
                             <entry><para>8 <guibutton>+/-</guibutton></para></entry>
                             <entry><para>-8</para></entry>
                           </row>
                         </tbody>

                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-erase-char"> 
      <title>To Erase Characters</title> 
      <para>To erase characters, use the buttons described in <xref linkend="gcalctool-TBL-erase-char"/>. </para>
                <table id="gcalctool-TBL-erase-char" frame="all">
                  <title>Erasing Characters</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Retorn enrèire</para> </entry>
                             <entry><para><guibutton>Bksp</guibutton></para></entry>
                             <entry><para>Removes the rightmost character from the display area.</para></entry>
                             <entry><para>1 <guibutton>+</guibutton> <guibutton>2</guibutton><guibutton>2</guibutton> <guibutton>Bksp</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>3</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Clear Entry</para> </entry>
                             <entry><para><guibutton>CE</guibutton></para></entry>
                             <entry><para>Removes the current value from the display area.</para>
                                    <para>This operation is the same as <guibutton>Clr</guibutton></para></entry>
                             <entry><para>1 <guibutton>+</guibutton> <guibutton>2</guibutton><guibutton>2</guibutton> <guibutton>CE</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>0</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Netejar</para> </entry>
                             <entry><para><guibutton>Clr</guibutton></para></entry>
                             <entry><para>Resets the current value in the display area to zero and removes any previous calculation results. <guibutton>Clr</guibutton> also deselects the <guilabel>Hyp</guilabel> and <guilabel>Inv</guilabel> options in Scientific.</para></entry>
                             <entry><para>1 <guibutton>+</guibutton> <guibutton>2</guibutton><guibutton>2</guibutton> <guibutton>Clr</guibutton></para></entry>
                             <entry><para>0</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    
    



  

          <sect3 id="gcalctool-ins-ascii"> 
            <title>To Display ASCII Values</title> 
                        <para>To display the ASCII value of a character, choose
                          <menuchoice>
                                 <guimenu>Edit</guimenu>
                                 <guimenuitem>Insert ASCII Value</guimenuitem>
                          </menuchoice>.</para>
                        <para>The Insert ASCII Value dialog is displayed.</para>
                        <para>Enter the required character in the <guilabel>Character</guilabel> field, then click <guibutton>Insert</guibutton>. The ASCII value of that character, in the current numeric base, appears in the display area. For example, the ASCII value of B in decimal base is 66.</para>
          </sect3>
        </sect2>

 <sect2 id="gcalctool-advanced-mode">
    <title>To Perform Advanced Calculations  </title>
  <para>To change to Advanced mode, choose 
        <menuchoice> 
          <guimenu>View</guimenu> 
          <guimenuitem>Advanced</guimenuitem> 
        </menuchoice>. 
      </para>
    <para>When you change to Advanced mode, the following buttons are displayed to the right of the Basic mode buttons:</para>
    <!-- ==== Figure ==== -->
      <figure id="gcalctool-FIG-advanced"> 
        <title><application>gcalctool</application> Advanced Mode Buttons</title> 
        <screenshot> 
          <mediaobject> 
            <imageobject><imagedata fileref="figures/gcalctool_advanced_window.png" format="PNG"/> 
            </imageobject>
            <textobject> 
              <phrase>Shows <application>gcalctool</application> Advanced mode buttons.  </phrase> 
            </textobject> 
          </mediaobject> 
        </screenshot> 
      </figure>
    <!-- ==== End of Figure ==== -->
                <table id="gcalctool-TBL-adv-calc" frame="all">
                  <title>Performing Advanced Calculations</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Percentatge</para> </entry>
                             <entry><para><guibutton>%</guibutton></para></entry>
                             <entry><para>Divides the current value by 100.</para></entry>
                             <entry><para>560 <guibutton>%</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>5,60</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Reciprocal</para> </entry>
                             <entry><para><guibutton>1/<replaceable>x</replaceable></guibutton></para></entry>
                             <entry><para>Divides 1 by the current value in the display area.</para></entry>
                             <entry><para>4 <guibutton>1/<replaceable>x</replaceable></guibutton></para></entry>
                             <entry><para>0,25</para></entry>
                           </row>
                    
                           <row valign="top">
                             <entry><para>Square Root</para> </entry>
                             <entry><para><guibutton>Sqrt</guibutton></para></entry>
                             <entry><para>Calculates the square root of the current value in the display area.</para></entry>
                             <entry><para><guibutton>Sqrt</guibutton> 9 <guibutton>)</guibutton><guibutton>=</guibutton></para></entry>
                             <entry><para>3</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Carrat</para> </entry>
                             <entry><para><replaceable>x</replaceable><superscript>2</superscript></para></entry>
                             <entry><para>Calculates the square of the current value in the display area.</para></entry>
                             <entry><para>3 <replaceable>x</replaceable><superscript>2</superscript></para></entry>
                             <entry><para>9</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Integer Portion</para> </entry>
                             <entry><para><guibutton>Int</guibutton></para></entry>
                             <entry><para>Calculates the integer portion of the current value in the display area.</para></entry>
                             <entry><para>-23.45 <guibutton>Int</guibutton></para></entry>
                             <entry><para>-23</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Fractional Portion</para> </entry>
                             <entry><para><guibutton>Frac</guibutton></para></entry>
                             <entry><para>Calculates the fractional portion of the current value in the display area.</para></entry>
                             <entry><para>-23.45 <guibutton>Frac</guibutton></para></entry>
                             <entry><para>-0,45</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Absolute Value</para> </entry>
                             <entry><para><guibutton>Abs</guibutton></para></entry>
                             <entry><para>Calculates the absolute value of the current value in the display area.</para></entry>
                             <entry><para>-23.45 <guibutton>Abs</guibutton></para></entry>
                             <entry><para>23,45</para></entry>
                         </row>
                           <row valign="top">
                         <entry><para>Parentheses</para> </entry>
                             <entry><para><guibutton>(</guibutton> and <guibutton>)</guibutton></para></entry>
                             <entry><para>Calculations within parentheses are performed first. You can nest parentheses to any level.</para></entry>
                           <entry>
                               <para>2 <guibutton>+</guibutton> <guibutton>3</guibutton> <guibutton>*</guibutton> <guibutton>4</guibutton> <guibutton>=</guibutton></para>
                               <para>2 <guibutton>+</guibutton> <guibutton>(</guibutton> <guibutton>3</guibutton> <guibutton>*</guibutton> <guibutton>4</guibutton> <guibutton>)</guibutton></para>
                             </entry>
                             <entry> <para>20</para>
                               <para>14</para>
                             </entry>
                               
                           </row>
                         </tbody>
                  </tgroup>
                </table>

<sect3 id="gcalctool-mem-reg"> 
      <title>To Use the Calculator Memory Registers</title> 
      <para>You can store values in any of the ten <application>gcalctool</application> memory registers <guilabel>R0</guilabel> to <guilabel>R9</guilabel>. To display the memory registers, choose 
        <menuchoice> 
          <guimenu>View</guimenu> 
          <guimenuitem>Memory Registers</guimenuitem> 
        </menuchoice>. 
      </para>
      <para>The memory registers can be dismissed by either choosing 
            <menuchoice><guimenu>View</guimenu><guimenuitem>Memory Registers</guimenuitem></menuchoice> 
            again, or by clicking on the <guibutton>Close</guibutton> button in the memory register window.</para>
        <para><xref linkend="gcalctool-TBL-mem-reg"/> describes the memory functions that you can use.</para>
                <table id="gcalctool-TBL-mem-reg" frame="all">
                  <title>Memory Functions</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Store Value in Memory Register</para> </entry>
                             <entry><para><guibutton>Sto</guibutton></para></entry>
                             <entry><para>Stores the current contents of the display area in the specified memory register. Click <guibutton>Sto</guibutton>, then select a memory register from the popup menu.</para>
                                   <para>To clear a memory register during a <application>gcalctool</application> session:</para>
                                     <orderedlist>
                                       <listitem><para>Click <guibutton>Clr</guibutton>.</para></listitem>
                                       <listitem><para>Click <guibutton>Sto</guibutton>.</para></listitem>
                                       <listitem><para>Select the memory register from the popup menu.</para></listitem>
                                     </orderedlist>
</entry>
                             <entry><para>22 <guibutton>Sto</guibutton> <guilabel>R2</guilabel></para></entry>
                             <entry><para>The value 22 is stored in memory register <guilabel>R2</guilabel>.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Retrieve Value From Memory Register</para> </entry>
                             <entry><para><guibutton>Rcl</guibutton></para></entry>
                             <entry><para>Retrieves the contents of the specified memory register. Click <guibutton>Rcl</guibutton>, then select the memory register from the popup menu.</para></entry>
                             <entry><para>0 <guibutton>Rcl</guibutton> <guilabel>R2</guilabel></para></entry>
                             <entry><para>The value in the display area is 22.</para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para>Exchange Memory Register Value and Displayed Value</para> </entry>
                             <entry><para><guibutton>Exch</guibutton></para></entry>
                             <entry><para>Exchanges the contents of the specified memory register and the current value in the display area. Click <guibutton>Exch</guibutton>, then select the memory register from the popup menu.</para></entry>
                             <entry><para>44 <guibutton>Exch</guibutton> <guilabel>R2</guilabel></para></entry>
                             <entry><para>The value in the display area changes from 44 to 22, the value in R2 changes from 22 to 44.</para> </entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
      <para>If you use keyboard shortcuts, you can use the keyboard to specify the memory register, as shown in the following examples: </para>
      <informaltable frame="all">
        <tgroup cols="2" colsep="1" rowsep="1">
          <colspec colname="COLSPEC0" colwidth="50*"/>
          <colspec colname="COLSPEC1" colwidth="50*"/>
          <thead>
            <row valign="top">
              <entry colname="COLSPEC0">
                <para>Keyboard Entry</para></entry>
              <entry colname="COLSPEC1">
                <para>Descripcion</para></entry>
            </row>
          </thead>
          <tbody> 
            <row valign="top">
              <entry><para><keycap>E</keycap> <keycap>2</keycap></para></entry>
              <entry><para>Stores the current contents of the display area in memory register <guilabel>R2</guilabel>.</para></entry>
            </row>
            <row valign="top">
              <entry><para><keycap>R</keycap> <keycap>2</keycap></para></entry>
              <entry><para>Retrieves the current contents of memory register <guilabel>R2</guilabel> into the display area.</para></entry>
            </row>
            <row valign="top">
              <entry><para><keycap>X</keycap> <keycap>2</keycap></para></entry>
              <entry><para>Exchanges the current value of the display area with the contents of memory register <guilabel>R2</guilabel>.</para></entry>
            </row>
          </tbody> 
        </tgroup>
      </informaltable>
    </sect3>


    </sect2> 
    <!-- ================ Usage Subsection ================================ -->
         <sect2 id="gcalctool-financial-mode"> 
      <title>To Perform Financial Calculations</title> 
      <para>To change to Financial mode, choose 
        <menuchoice> 
          <guimenu>View</guimenu> 
          <guimenuitem>Financial</guimenuitem> 
        </menuchoice>. 
      </para>
     <para>When you change to Financial mode, the following buttons are displayed above the Basic and Advanced mode buttons:</para>

    <!-- ==== Figure ==== -->
      <figure id="gcalctool-FIG-financial"> 
        <title><application>gcalctool</application> Financial Mode Buttons</title> 
        <screenshot> 
          <mediaobject> 
            <imageobject><imagedata fileref="figures/gcalctool_financial_window.png" format="PNG"/> 
            </imageobject>
            <textobject> 
              <phrase>Shows <application>gcalctool</application> Financial mode buttons.  </phrase> 
            </textobject> 
          </mediaobject> 
        </screenshot> 
      </figure>
    <!-- ==== End of Figure ==== -->
      <para>To perform financial calculations, use the buttons described in <xref linkend="gcalctool-TBL-financial-calc"/>. 
</para>
                <table id="gcalctool-TBL-financial-calc" frame="all">
                  <title>Performing Financial Calculations</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Compounding Term</para> </entry>
                             <entry><para><guibutton>Ctrm</guibutton></para></entry>
                             <entry><para>Calculates the number of compounding periods necessary to increase an investment from a present value to a future value, at a fixed interest rate per compounding period.</para>
                             </entry>
                             <entry><para>You have just deposited $8000 in an account that pays an annual interest rate of 9%, compounded monthly. Given the annual interest rate, you determine that the simple monthly interest rate is 0.09 / 12 = 0.0075. To calculate the time period necessary to double your investment, click <guibutton>Ctrm</guibutton>, and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Periodic Interest Rate</term>
                                <listitem><para>0,0075</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Future Value</term>
                                <listitem><para>16000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Present Value</term>
                                <listitem><para>8000</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>92,77</para>
                                    <para>The investment doubles in value in 92.77 months.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Double-Declining Depreciation</para> </entry>
                             <entry><para><guibutton>Ddb</guibutton></para></entry>
                             <entry><para>Calculates the depreciation allowance on an asset for a specified period of time, using the double-declining balance method.
</para>
                             </entry>
                             <entry><para>You have just purchased an office machine for $8000. The useful life of this machine is six years. The salvage value after six years is $900.
To calculate the depreciation expense for the fourth year, using the double-declining balance method, click <guibutton>Ddb</guibutton> and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Cost</term>
                                <listitem><para>8000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Salvage</term>
                                <listitem><para>900</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Life</term>
                                <listitem><para>6</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Period</term>
                                <listitem><para>4</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>790,12</para>
                                    <para>The depreciation expense for the fourth year is $790.12.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Future Value</para> </entry>
                             <entry><para><guibutton>Fv</guibutton></para></entry>
                             <entry><para>Calculates the future value of an investment based on a series of equal payments at a specific periodic interest rate, over the number of payment periods in the term.
</para>
                             </entry>
                             <entry><para>You plan to deposit $4000 in a bank account on the last day of each year for the next 20 years. The account pays 8% interest, compounded annually. Interest is paid on the last day of each year. 
To calculate the value of your account in 20 years, press <guibutton>Fv</guibutton> and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Periodic Payment</term>
                                <listitem><para>4000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Periodic Interest Rate</term>
                                <listitem><para>0,08</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Number Of Periods</term>
                                <listitem><para>20</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>183047,86</para>
                                    <para>At the end of 20 years, the value of the account is $183,047.86.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Gross Profit Margin</para></entry>
                             <entry><para><guibutton>Gpm</guibutton></para></entry>
                             <entry><para>Calculates the resale price of a product, based on the product cost and the wanted gross profit margin.</para></entry>
                             <entry><para>You sell T-Shirts online. Each T-Shirt cost you $12 in material and labor. You want to sell the T-Shirts with a Gross Profit Margin of 0.40 - for every five dollars you earn, you want two to be profit. To calculate the price you would have to sell your T-Shirts for, press <guibutton>Gpm</guibutton> and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Cost</term>
                                <listitem><para>12</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Margin</term>
                                <listitem><para>0.40</para></listitem>
                                </varlistentry>
                             </variablelist>
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>20</para>
                             <para>You will have to sell your T-Shirts for $20</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Periodic Payment</para> </entry>
                             <entry><para><guibutton>Pmt</guibutton></para></entry>
                             <entry><para>Calculates the amount of the periodic payment of a loan, where payments are made at the end of each payment period. 
</para>
                             </entry>
                             <entry><para>You are considering a $120,000 mortgage for 30 years at an annual interest rate of 11.0%. Given the annual interest rate, you determine that the simple monthly interest rate is 0.11 / 12 = 0.00917. The term is 30 * 12 = 360 months. To calculate the monthly repayment for this mortgage, press <guibutton>Pmt</guibutton> and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Principal</term>
                                <listitem><para>120000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Periodic Interest Rate</term>
                                <listitem><para>0,00917</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Term</term>
                                <listitem><para>360</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>1143,15</para>
                                    <para>The monthly repayment is $1143.15.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Present Value</para> </entry>
                             <entry><para><guibutton>Pv</guibutton></para></entry>
                             <entry><para>Calculates the present value of an investment based on a series of equal payments, discounted at a periodic interest rate, over the number of payment periods in the term.
</para>
                             </entry>
                             <entry><para>You have just won a million dollars. The prize is awarded in 20 annual payments of $50,000 each. Annual payments are received at the end of each year. If you were to accept the annual payments of $50,000, you would invest the money at a rate of 9%, compounded annually.</para>
                                    <para>However, you are given the option of receiving a single lump-sum payment of $400,000 instead of the million dollars annuity. 
To calculate which option is worth more in today's dollars, press <guibutton>Pv</guibutton> and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Periodic Payment</term>
                                <listitem><para>50000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Periodic Interest Rate</term>
                                <listitem><para>0,09</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Number Of Periods</term>
                                <listitem><para>20</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>456427,28</para>
                                    <para>The $1,000,000 paid over 20 years is worth $456,427.28 in present dollars.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Periodic Interest Rate</para> </entry>
                             <entry><para><guibutton>Taus</guibutton></para></entry>
                             <entry><para>Calculates the periodic interest necessary to increase an investment of a present value to a future value, over a number of compounding periods.
</para>
                             </entry>
                             <entry><para>You have invested $20,000 in a bond. The bond matures in five years, and has a maturity value of $30,000. Interest is compounded monthly. The term is 5 * 12 = 60 months.
To calculate the periodic interest rate for this investment, press <guibutton>Rate</guibutton> and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Future Value</term>
                                <listitem><para>30000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Present Value</term>
                                <listitem><para>20000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Term</term>
                                <listitem><para>60</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>,00678</para>
                                    <para>The monthly interest rate is 0.678%. The annual interest rate is 0.678% * 12 = 8.14%.
</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Straight-Line Depreciation</para> </entry>
                             <entry><para><guibutton>Sln</guibutton></para></entry>
                             <entry><para>Calculates the straight-line depreciation of an asset for one period. The depreciable cost is <replaceable>cost</replaceable> - <replaceable>salvage</replaceable>. The straight-line method of depreciation divides the depreciable cost evenly over the useful life of an asset. The useful life is the number of periods, typically years, over which an asset is depreciated.
</para>
                             </entry>
                             <entry><para>You have just purchased an office machine for $8000. The useful life of this machine is six years. The salvage value after six years is $900.
To calculate the yearly depreciation expense, using the straight-line method, prss <guibutton>Sln</guibutton>, and put the following values into the first three memory registers:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Cost</term>
                                <listitem><para>8000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Salvage</term>
                                <listitem><para>900</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Life</term>
                                <listitem><para>6</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>1183,33</para>
                                    <para>The yearly depreciation expense is $1183.33.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Sum-Of-The-Years'-Digits Depreciation</para> </entry>
                             <entry><para><guibutton>Syd</guibutton></para></entry>
                             <entry><para>Calculates the depreciation allowance on an asset for a specified period of time, using the Sum-Of-The-Years'-Digits method. This method of depreciation accelerates the rate of depreciation, so that more depreciation expense occurs in earlier periods than in later ones.
The depreciable cost is <replaceable>cost</replaceable> - <replaceable>salvage</replaceable>. The useful life is the number of periods, typically years, over which an asset is depreciated.
</para>
                             </entry>
                             <entry><para>You have just purchased an office machine for $8000. The useful life of this machine is six years. The salvage value after six years is $900.
To calculate the depreciation expense for the fourth year, using the sum-of-the-years'-digits method, press <guibutton>Syd</guibutton>, and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Cost</term>
                                <listitem><para>8000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Salvage</term>
                                <listitem><para>900</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Life</term>
                                <listitem><para>6</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Period</term>
                                <listitem><para>4</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>1014,29</para>
                                    <para>The depreciation expense for the fourth year is $1014.29.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Payment Period</para> </entry>
                             <entry><para><guibutton>Term</guibutton></para></entry>
                             <entry><para>Calculates the number of payment periods that are necessary during the term of an ordinary annuity, to accumulate a future value, at a certain periodic interest rate.</para>
                             </entry>
                             <entry><para>You plan to deposit $1800 in a bank account on the last day of each year. The account pays 11% interest, compounded annually. Interest is paid on the last day of each year. 
To calculate the time period necessary to accumulate $120,000, press <guibutton>Term</guibutton>, and put the following values into the text entries:</para>
                             <variablelist>
                                <varlistentry>
                                <term>Periodic Payment</term>
                                <listitem><para>1800</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Future Value</term>
                                <listitem><para>120000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>Periodic Interest Rate</term>
                                <listitem><para>0,11</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>20,32</para>
                                    <para>$120,000 accumulates in the account in 20.32 years.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect2> 
    <!-- ================ Usage Subsection ================================ -->
    <sect2 id="gcalctool-scientific-mode"> 
      <title>To Perform Scientific Calculations</title> 
      <para>To change to Scientific mode, choose 
        <menuchoice> 
          <guimenu>View</guimenu> 
          <guimenuitem>Scientific</guimenuitem> 
        </menuchoice>. 
      </para>
    <para>When you change to Scientific mode, the following buttons are displayed above the Basic and Advanced mode buttons:</para>

    <!-- ==== Figure ==== -->
      <figure id="gcalctool-FIG-scientific"> 
        <title><application>gcalctool</application> Scientific Mode Buttons</title> 
        <screenshot> 
          <mediaobject> 
            <imageobject><imagedata fileref="figures/gcalctool_scientific_window.png" format="PNG"/> 
            </imageobject>
            <textobject> 
              <phrase>Shows <application>gcalctool</application> Scientific mode buttons.  </phrase> 
            </textobject> 
          </mediaobject> 
        </screenshot> 
      </figure>
    <!-- ==== End of Figure ==== -->
    <sect3 id="gcalctool-set-acc"> 
      <title>To Set the Accuracy</title> 
      <para>To set the accuracy of the display area and of the memory registers, click <guibutton>Acc</guibutton>, then select from the popup menu the accuracy level that you require. The current accuracy level is indicated by a preceding black circle in the popup menu. Up to 99 significant places can be displayed. The default accuracy is 9 significant places. </para>
<para>To set the accuracy level above 9, select <guilabel>Other (9) ...</guilabel>, then choose the accuracy level you require in the <guilabel>Set Precision</guilabel> popup.</para>
      <para>By default, trailing zeroes are not shown. To display trailing zeroes, click <guibutton>Acc</guibutton> then select <guilabel>Show Trailing Zeroes</guilabel> from the popup menu, or choose <menuchoice> <guimenu>View</guimenu> <guimenuitem>Show Trailing Zeroes</guimenuitem> </menuchoice>. A preceding check mark in the <guibutton>Acc</guibutton> popup menu or <guimenu>View</guimenu> menu indicates that the <guilabel>Show Trailing Zeroes</guilabel> option has been selected. To hide trailing zeroes, choose <menuchoice> <guimenu>View</guimenu> <guimenuitem>Show Trailing Zeroes</guimenuitem> </menuchoice> again.</para>
      <para>The examples in the following table show how the accuracy setting affects <replaceable>x</replaceable> in the display area, when you use decimal base, with the <guimenuitem>Show Trailing Zeroes</guimenuitem> option selected, for the <literal>1 / 8 = <replaceable>x</replaceable></literal> calculation: </para>
                <informaltable frame="all">
                  <tgroup cols="2" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Precision</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>1 decimala significativa</para></entry>
                             <entry><para>1,2</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>2 decimalas significativas</para></entry>
                             <entry><para>1,25</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>3 decimalas significativas</para></entry>
                             <entry><para>1,250</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </informaltable>
    </sect3>
    <sect3 id="gcalctool-display-type"> 
      <title>To Set the Display Type</title> 
      <para>To set the display type, select one of the buttons described in <xref linkend="gcalctool-TBL-display-type"/>. </para>
                <table id="gcalctool-TBL-display-type" frame="all">
                  <title>Setting the Display Type</title> 
                  <tgroup cols="3" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Engineering Display Type</para> </entry>
                             <entry><para><guibutton>Eng</guibutton></para></entry>
                             <entry><para>Sets the display type to engineering format. Results are displayed in scientific notation. The exponent is always a multiple of three.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Fixed-Point Display Type</para> </entry>
                             <entry><para><guibutton>Fix</guibutton></para></entry>
                             <entry><para>Sets the display type to fixed-point format. Results are not displayed in scientific notation. Fixed-point is the default display type.  If you change from scientific mode to either basic mode or financial mode, <application>gcalctool</application> automatically sets the display type to fixed-point format.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Scientific Display Type</para> </entry>
                             <entry><para><guibutton>Sci</guibutton></para></entry>
                             <entry><para>Sets the display type to scientific format. Results are displayed in scientific notation, with a fixed number of numeric digits.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-trig-type"> 
      <title>To Set the Trigonometric Type</title> 
      <para>To set the trigonometric type, select one of the buttons described in <xref linkend="gcalctool-TBL-trig-type"/>. </para>
                <table id="gcalctool-TBL-trig-type" frame="all">
                  <title>Setting the Trigonometric Type</title> 
                  <tgroup cols="3" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Grases</para> </entry>
                             <entry><para><guibutton>Grases</guibutton></para></entry>
                             <entry><para>Sets the trigonometric type to degrees. Degrees is the default trigonometric type.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Gradians</para> </entry>
                             <entry><para><guibutton>Gradians</guibutton></para></entry>
                             <entry><para>Sets the trigonometric type to gradians.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Radians</para> </entry>
                             <entry><para><guibutton>Radians</guibutton></para></entry>
                             <entry><para>Sets the trigonometric type to radians.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-trig-options"> 
      <title>To Set the Trigonometric Options</title> 
      <para>To set the trigonometric options, use the options described in <xref linkend="gcalctool-TBL-trig-options"/>. </para>
                <table id="gcalctool-TBL-trig-options" frame="all">
                  <title>Setting the Trigonometric Options</title> 
                  <tgroup cols="3" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Hyperbolic Option Indicator</para> </entry>
                             <entry><para><guibutton>Hyp</guibutton></para></entry>
                             <entry><para>Selects the hyperbolic option for use with the trigonometric functions.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Inverse Option Indicator</para> </entry>
                             <entry><para><guibutton>Inv</guibutton></para></entry>
                             <entry><para>Selects the inverse option for use with the trigonometric functions.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
      <para>By default, the options described in <xref linkend="gcalctool-TBL-trig-options"/> are not selected. Click <guibutton>Clr</guibutton> to deselect these options. </para>

    </sect3>
    <sect3 id="gcalctool-trig-calc"> 
      <title>To Calculate Trigonometric Values</title> 
      <para>To calculate trigonometric values, use the buttons described in <xref linkend="gcalctool-TBL-trig-calc"/>. </para>
                <table id="gcalctool-TBL-trig-calc" frame="all">
                  <title>Calculating Trigonometric Values</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Cosine <literal>cos</literal></para> </entry>
                             <entry><para><guibutton>Cos</guibutton>, <guilabel>Hyp</guilabel> option not selected, <guilabel>Inv</guilabel> option not selected</para></entry>
                             <entry><para>Calculates the cosine of the current value in the display area.</para></entry>
                             <entry><para>60 <guibutton>Cos</guibutton></para></entry>
                             <entry><para>0,5</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Arc Cosine <literal>acos</literal></para> </entry>
                             <entry><para><guibutton>Cos</guibutton>, <guilabel>Hyp</guilabel> option not selected, <guilabel>Inv</guilabel> option selected</para></entry>
                             <entry><para>Calculates the arc cosine of the current value in the display area.</para></entry>
                             <entry><para>0.5 <guilabel>Inv</guilabel> <guibutton>Cos</guibutton></para></entry>
                             <entry><para>60</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Hyperbolic Cosine <literal>cosh</literal></para> </entry>
                             <entry><para><guibutton>Cos</guibutton>, <guilabel>Hyp</guilabel> option selected, <guilabel>Inv</guilabel> option not selected</para></entry>
                             <entry><para>Calculates the hyperbolic cosine of the current value in the display area.</para></entry>
                             <entry><para>0.4 <guilabel>Hyp</guilabel> <guibutton>Cos</guibutton></para></entry>
                             <entry><para>1,081072372</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Arc Hyperbolic Cosine <literal>acosh</literal></para> </entry>
                             <entry><para><guibutton>Cos</guibutton>, <guilabel>Hyp</guilabel> option selected, <guilabel>Inv</guilabel> option selected</para></entry>
                             <entry><para>Calculates the arc hyperbolic cosine of the current value in the display area.</para></entry>
                             <entry><para>1.6 <guilabel>Hyp</guilabel> <guilabel>Inv</guilabel> <guibutton>Cos</guibutton></para></entry>
                             <entry><para>1,046967915</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Sine <literal>sin</literal></para> </entry>
                             <entry><para><guibutton>Sin</guibutton>, <guilabel>Hyp</guilabel> option not selected, <guilabel>Inv</guilabel> option not selected</para></entry>
                             <entry><para>Calculates the sine of the current value in the display area.</para></entry>
                             <entry><para>90 <guibutton>Sin</guibutton></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Arc Sine <literal>asin</literal></para> </entry>
                             <entry><para><guibutton>Sin</guibutton>, <guilabel>Hyp</guilabel> option not selected, <guilabel>Inv</guilabel> option selected</para></entry>
                             <entry><para>Calculates the arc sine of the current value in the display area.</para></entry>
                             <entry><para>1 <guilabel>Inv</guilabel> <guibutton>Sin</guibutton></para></entry>
                             <entry><para>90</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Hyperbolic Sine <literal>sinh</literal></para> </entry>
                             <entry><para><guibutton>Sin</guibutton>, <guilabel>Hyp</guilabel> option selected, <guilabel>Inv</guilabel> option not selected</para></entry>
                             <entry><para>Calculates the hyperbolic sine of the current value in the display area.</para></entry>
                             <entry><para>0.4 <guilabel>Hyp</guilabel> <guibutton>Sin</guibutton></para></entry>
                             <entry><para>0,410752326</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Arc Hyperbolic Sine <literal>asinh</literal></para> </entry>
                             <entry><para><guibutton>Sin</guibutton>, <guilabel>Hyp</guilabel> option selected, <guilabel>Inv</guilabel> option selected</para></entry>
                             <entry><para>Calculates the arc hyperbolic sine of the current value in the display area.</para></entry>
                             <entry><para>1.6 <guilabel>Hyp</guilabel> <guilabel>Inv</guilabel> <guibutton>Sin</guibutton></para></entry>
                             <entry><para>1.248983328</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Tangent <literal>tan</literal></para> </entry>
                             <entry><para><guibutton>Tan</guibutton>, <guilabel>Hyp</guilabel> option not selected, <guilabel>Inv</guilabel> option not selected</para></entry>
                             <entry><para>Calculates the tangent of the current value in the display area.</para></entry>
                             <entry><para>45 <guibutton>Tan</guibutton></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Arc Tangent <literal>atan</literal></para> </entry>
                             <entry><para><guibutton>Tan</guibutton>, <guilabel>Hyp</guilabel> option not selected, <guilabel>Inv</guilabel> option selected</para></entry>
                             <entry><para>Calculates the arc tangent of the current value in the display area.</para></entry>
                             <entry><para>1 <guilabel>Inv</guilabel> <guibutton>Tan</guibutton></para></entry>
                             <entry><para>45</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Hyperbolic Tangent <literal>tanh</literal></para> </entry>
                             <entry><para><guibutton>Tan</guibutton>, <guilabel>Hyp</guilabel> option selected, <guilabel>Inv</guilabel> option not selected</para></entry>
                             <entry><para>Calculates the hyperbolic tangent of the current value in the display area.</para></entry>
                             <entry><para>0.6 <guilabel>Hyp</guilabel> <guibutton>Tan</guibutton></para></entry>
                             <entry><para>0.537049567</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Arc Hyperbolic Tangent <literal>atanh</literal></para> </entry>
                             <entry><para><guibutton>Tan</guibutton>, <guilabel>Hyp</guilabel> option selected, <guilabel>Inv</guilabel> option selected</para></entry>
                             <entry><para>Calculates the arc hyperbolic tangent of the current value in the display area.</para></entry>
                             <entry><para>0.6 <guilabel>Hyp</guilabel> <guilabel>Inv</guilabel> <guibutton>Tan</guibutton></para></entry>
                             <entry><para>0,693147181</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-logs-calc"> 
      <title>To Calculate Logarithms</title> 
      <para>To calculate logarithms, use the buttons described in <xref linkend="gcalctool-TBL-logs-calc"/>. </para>
                <table id="gcalctool-TBL-logs-calc" frame="all">
                  <title>Calculating Logarithms</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Common Logarithm Base 10</para> </entry>
                             <entry><para>Log<subscript><replaceable>10</replaceable></subscript></para></entry>
                             <entry><para>Calculates the common logarithm (base 10) of the current value in the display area.</para></entry>
                             <entry><para>10 Log<subscript><replaceable>10</replaceable></subscript></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Natural Logarithm</para> </entry>
                             <entry><para><guibutton>Ln</guibutton></para></entry>
                             <entry><para>Calculates the natural logarithm of the current value in the display area.</para></entry>
                             <entry><para>10 <guibutton>Ln</guibutton></para></entry>
                             <entry><para>2,30</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Common Logarithm Base 2</para> </entry>
                             <entry><para>Log<subscript><replaceable>2</replaceable></subscript></para></entry>
                             <entry><para>Calculates the common logarithm (base 2) of the current value in the display area.</para></entry>
                             <entry><para>10 Log<subscript><replaceable>2</replaceable></subscript></para></entry>
                             <entry><para>3,32</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
                <note>
                  <para>Common antilogarithm and natural antilogarithm are not supported in this version of <application>gcalctool</application>.</para>
                </note>
    </sect3>
    <sect3 id="gcalctool-enter-exp"> 
      <title>To Enter Exponential Numbers</title> 
      <para>To enter exponential numbers, use the <guibutton>Exp</guibutton> button.</para>
      <para>The <guibutton>Exp</guibutton> button enables you to enter numbers in scientific notation, that is, <replaceable>mantissa</replaceable> * <replaceable>base</replaceable><superscript><replaceable>exponent</replaceable></superscript>:
</para>
<variablelist>
  <varlistentry>
    <term><replaceable>mantissa</replaceable></term>
    <listitem><para>Current non-zero value in the display area. If the current value in the display area is zero, the mantissa is 1.0. </para></listitem>
  </varlistentry>
  <varlistentry>
    <term><replaceable>base</replaceable></term>
    <listitem><para>2, 8, 10, or 16 for binary, octal, decimal, and hexadecimal numeric base respectively.  </para></listitem>
  </varlistentry>
  <varlistentry>
    <term><replaceable>exponent</replaceable></term>
    <listitem><para>Next number that you enter.
</para></listitem>
  </varlistentry>
</variablelist>

<para>When you click <guibutton>Exp</guibutton>, the calculator displays <literal>. +</literal> to represent 
<replaceable>base</replaceable> to the power of the next number that you enter. </para>
<para>To change the sign of the number, use the <guibutton>+/-</guibutton> button before the <guibutton>Exp</guibutton> button.
To change the sign of the exponent (the power to which the number is raised) use <guibutton>-</guibutton> after the
<guibutton>Exp</guibutton> button.</para>

<para>To enter a decimal number in exponential format, use the guidelines in the following table: </para>
          <informaltable frame="all">
            <tgroup cols="3" colsep="1" rowsep="1">
                   <colspec colname="COLSPEC0" colwidth="50*"/>
                   <colspec colname="COLSPEC1" colwidth="50*"/>
                   <thead>
                          <row valign="top">
                            <entry colname="COLSPEC0">
                                   <para>Nombre</para></entry>
                            <entry colname="COLSPEC1">
                                   <para>Enter</para></entry>
                            <entry colname="COLSPEC2">
                                   <para>Number Displayed</para></entry>
                          </row>
                   </thead> 
                   <tbody> 
                     <row valign="top">
                       <entry><para>1200000000</para></entry>
                       <entry><para>12 <guibutton>Exp</guibutton> <guibutton>+</guibutton> <guibutton>8</guibutton> <guibutton>=</guibutton></para></entry>
                       <entry><para>1200000000</para></entry>
                     </row>
                     <row valign="top">
                       <entry><para>-1200000000</para></entry>
                       <entry><para><guibutton>-</guibutton> 12 <guibutton>Exp</guibutton> <guibutton>+</guibutton> <guibutton>8</guibutton> <guibutton>=</guibutton> </para></entry>
                       <entry><para>-1200000000</para></entry>
                     </row>
                     <row valign="top">
                       <entry><para>0,00000012</para></entry>
                       <entry><para>12 <guibutton>Exp</guibutton> <guibutton>-</guibutton> <guibutton>8</guibutton> <guibutton>=</guibutton> </para></entry>
                       <entry><para>1.2e-7</para></entry>
                     </row>
                     <row valign="top">
                       <entry><para>-0,00000012</para></entry>
                       <entry><para><guibutton>-</guibutton> 12 <guibutton>Exp</guibutton> <guibutton>-</guibutton> <guibutton>8</guibutton> <guibutton>=</guibutton> </para></entry>
                       <entry><para>-1.2e-7</para></entry>
                     </row>
                   </tbody>
            </tgroup>
          </informaltable>

    </sect3>
    <sect3 id="gcalctool-edit-const"> 
      <title>To Use Constant Values</title> 
      <para>Click <guibutton>Con</guibutton> to display the list of defined constant values. All constant values are specified in decimal numeric base, even if the current numeric base is not decimal.</para>
      <para>Select a constant from the menu to enter its value in the display area. If you use the keyboard shortcut <keycap>#</keycap>, you can use the keyboard to specify the constant, as shown in the following example:</para>
      <informaltable frame="all">
        <tgroup cols="2" colsep="1" rowsep="1">
          <colspec colname="COLSPEC0" colwidth="50*"/>
          <colspec colname="COLSPEC1" colwidth="50*"/>
          <thead>
            <row valign="top">
              <entry colname="COLSPEC0">
                <para>Keyboard Entry</para></entry>
              <entry colname="COLSPEC1">
                <para>Contrast</para></entry>
            </row>
          </thead>
          <tbody>
            <row valign="top">
              <entry><para><keycap>#</keycap> <keycap>3</keycap> </para></entry>
              <entry><para>C3</para></entry>
            </row>
          </tbody>
        </tgroup>
      </informaltable>
      <para>The <application>gcalctool</application> application provides ten default constant values, as described in the following table:</para>
                <informaltable frame="all">
                  <tgroup cols="3" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1" colwidth="50*"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Nombre</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Valor</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>C0</para></entry>
                             <entry><para>0,621</para></entry>
                             <entry><para>Kilometer-to-mile conversion factor</para>
                                    <para>Multiply the current value in the display area by this constant, to convert from kilometers per hour to miles per hour. For example, 8 * <guibutton>Con</guibutton> <guilabel>C0</guilabel> <keycap>=</keycap> 5.</para>
                                    <para>Divide the current value in the display area by this constant, to convert from miles per hour to kilometers per hour. For example, 5 / <guibutton>Con</guibutton> <guilabel>C0</guilabel> <keycap>=</keycap> 8.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C1</para></entry>
                             <entry><para>1,414213562</para></entry>
                             <entry><para>Square root of 2</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C2</para></entry>
                             <entry><para>2,718281828</para></entry>
                             <entry><para>e</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C3</para></entry>
                             <entry><para>3,141592653</para></entry>
                             <entry><para>pi</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C4</para></entry>
                             <entry><para>0,3937007</para></entry>
                             <entry><para>Centimeter-to-inch conversion factor</para>
                                    <para>Multiply the current value in the display area by this constant, to convert from centimeters to inches. For example, 30 * <guibutton>Con</guibutton> <guilabel>C4</guilabel> <keycap>=</keycap> 12.</para>
                                    <para>Divide the current value in the display area by this constant, to convert from inches to centimeters. For example, 12 / <guibutton>Con</guibutton> <guilabel>C4</guilabel> <keycap>=</keycap> 30.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C5</para></entry>
                             <entry><para>57,295779513</para></entry>
                             <entry><para>Degrees in a radian</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C6</para></entry>
                             <entry><para>1048576</para></entry>
                             <entry><para>2 ^ 20</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C7</para></entry>
                             <entry><para>0,0353</para></entry>
                             <entry><para>Gram-to-ounce conversion factor</para>
                                    <para>Multiply the current value in the display area by this constant, to convert from grams to ounces. For example, 500 * <guibutton>Con</guibutton> <guilabel>C7</guilabel> <keycap>=</keycap> 18.</para>
                                    <para>Divide the current value in the display area by this constant, to convert from ounces to grams. For example, 18 / <guibutton>Con</guibutton> <guilabel>C7</guilabel> <keycap>=</keycap> 500.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C8</para></entry>
                             <entry><para>0,948</para></entry>
                             <entry><para>Kilojoule-to-British-thermal-unit conversion factor</para>
                                    <para>Multiply the current value in the display area by this constant, to convert from kilojoules to British thermal units. For example, 10 * <guibutton>Con</guibutton> <guilabel>C8</guilabel> <keycap>=</keycap> 9.48.</para>
                                    <para>Divide the current value in the display area by this constant, to convert from British thermal units to kilojoules. For example, 9.48 / <guibutton>Con</guibutton> <guilabel>C8</guilabel> <keycap>=</keycap> 10.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>C9</para></entry>
                             <entry><para>0,061</para></entry>
                             <entry><para>Cubic-centimeter-to-cubic-inch conversion factor</para>
                                    <para>Multiply the current value in the display area by this constant, to convert from cubic centimeters to cubic inches. For example, 100 * <guibutton>Con</guibutton> <guilabel>C9</guilabel> <keycap>=</keycap> 6.10.</para>
                                    <para>Divide the current value in the display area by this constant, to convert from cubic inches to cubic centimeters. For example, 6.10 / <guibutton>Con</guibutton> <guilabel>C9</guilabel> <keycap>=</keycap> 100.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </informaltable>
      <para>You can overwrite the default constants to store your own constants.</para>
      <para>To store a new constant or edit an existing constant, perform the following steps:</para>
      <orderedlist>
        <listitem>
           <para>Click <guibutton>Con</guibutton>, then select <guilabel>Edit Constants</guilabel> from the popup menu. </para>
        </listitem>
        <listitem>
      <para>In the <guilabel>Edit Constants</guilabel> dialog, select the constant that you want to overwrite or edit.</para>
        </listitem>
        <listitem>
      <para>Click on the Value field, then enter the new value.</para>
        </listitem>
        <listitem>
      <para>Click on the Description field, then enter the new description.</para>
        </listitem>
        <listitem>
      <para>Click <guibutton>OK</guibutton> to save your changes and close the <guilabel>Edit Constants</guilabel> dialog.</para>
        </listitem>
      </orderedlist>
    </sect3>
    <sect3 id="gcalctool-edit-func"> 
      <title>To Use Functions</title> 
      <para>To show the available functions, click <guibutton>Fun</guibutton>. A popup menu displays the list of defined functions. Select a function from the menu to run that function.</para>
<para>If you use the keyboard shortcut <keycap>F</keycap>, you can use the keyboard to specify the function, as shown in the following example:
</para>
      <informaltable frame="all">
        <tgroup cols="2" colsep="1" rowsep="1">
          <colspec colname="COLSPEC0" colwidth="50*"/>
          <colspec colname="COLSPEC1" colwidth="50*"/>
          <thead>
            <row valign="top">
              <entry colname="COLSPEC0">
                <para>Keyboard Entry</para></entry>
              <entry colname="COLSPEC1">
                <para>Foncion</para></entry>
            </row>
          </thead>
          <tbody>
            <row valign="top">
              <entry><para><keycap>F</keycap> <keycap>3</keycap> </para></entry>
              <entry><para>F3</para></entry>
            </row>
          </tbody>
        </tgroup>
      </informaltable>

      <para>The <application>gcalctool</application> application does not provide any default functions. You can store up to ten functions. </para>
      <para>To store a new function or edit an existing function, perform the following steps:</para>
      <orderedlist>
        <listitem>
           <para>Click <guibutton>Fun</guibutton>, then select <guilabel>Edit Functions</guilabel> from the popup menu.</para>
        </listitem>
        <listitem>
      <para>In the <guilabel>Edit Functions</guilabel> dialog, select a blank entry, or the function that you want to overwrite.</para>
        </listitem>
        <listitem>
      <para>Click on the Value field, then enter the new equation to solve. You can use "ans" for the result of the previous equation and "R5" for register 5 etc. For example, enter <literal>(-R1+sqrt(R1^2-4*R0*R2))/(2*R0)</literal> to calculate a root of the quadratic equation R0*x^2 + R1*x + R2 = 0.</para>
        </listitem>
        <listitem>
      <para>Click on the Description field, then enter the new description. For example, <literal>Quadratic Solver</literal>.</para>
        </listitem>
        <listitem>
      <para>Click <guibutton>OK</guibutton> to save your changes and close the <guilabel>Edit Functions</guilabel> dialog.</para>
        </listitem>
      </orderedlist>
    </sect3>
    <sect3 id="gcalctool-misc-calc"> 
      <title>To Perform Miscellaneous Scientific Calculations</title> 
      <para>To perform miscellaneous scientific calculations, use the buttons described in <xref linkend="gcalctool-TBL-misc-calc"/>. </para>
                <table id="gcalctool-TBL-misc-calc" frame="all">
                  <title>Performing Miscellaneous Scientific Calculations</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                                                      <row valign="top">
                             <entry><para>e to the <replaceable>x</replaceable> power</para> </entry>
                             <entry><para>e<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>Calculates the value of <literal>e</literal> raised to the power of the current value in the display area.</para></entry>
                             <entry><para>2 e<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>7,39</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>10 to the <replaceable>x</replaceable> power</para> </entry>
                             <entry><para>10<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>Calculates the value of 10 raised to the power of the current value in the display area.</para></entry>
                             <entry><para>2 10<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>100</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>2 to the <replaceable>x</replaceable> power</para> </entry>
                             <entry><para>2<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>Calculates the value of 2 raised to the power of the current value in the display area.</para></entry>
                             <entry><para>2 2<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>4</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>x to the <replaceable>y</replaceable> power</para> </entry>
                             <entry><para><replaceable>x</replaceable><superscript><replaceable>y</replaceable></superscript></para></entry>
                             <entry><para>Raises the current value in the display area to the power of the next value that you enter.</para></entry>
                             <entry><para>2 <replaceable>x</replaceable><superscript><replaceable>y</replaceable></superscript> <guibutton>4</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>16</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>x to the reciprocal <replaceable>y</replaceable> power</para> </entry>
                             <entry><para><replaceable>x</replaceable><superscript>1/<replaceable>y</replaceable></superscript></para></entry>
                             <entry><para>Raises the current value in the display area to the reciprocal power of the next value that you enter.</para></entry>
                             <entry><para>2 <replaceable>x</replaceable><superscript>1/<replaceable>y</replaceable></superscript> <guibutton>4</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>16</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para><replaceable>x</replaceable> Factorial</para> </entry>
                             <entry><para><guibutton><replaceable>x</replaceable>!</guibutton></para></entry>
                             <entry><para>Calculates the factorial of the current value in the display area. <replaceable>x</replaceable> factorial is <replaceable>x</replaceable>*(<replaceable>x</replaceable>-1)*(<replaceable>x</replaceable>-2)...*1. This function applies only to positive integers.</para></entry>
                             <entry><para>4 <guibutton><replaceable>x</replaceable>!</guibutton></para></entry>
                             <entry><para>24</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Modulus Division</para> </entry>
                             <entry><para><guibutton>Mod</guibutton></para></entry>
                             <entry><para>Divides the current integer value in the display area by the next integer number that you enter, displaying the remainder.</para></entry>
                             <entry><para>15 <guibutton>Mod</guibutton> <guibutton>4</guibutton> <guibutton>=</guibutton></para></entry>
                             <entry><para>3</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Random Number Generator</para> </entry>
                             <entry><para><guibutton>Rand</guibutton></para></entry>
                             <entry><para>Generates a random number in the range 0.0 to 1.0 then displays the random number in the display area.</para></entry>
                             <entry><para><guibutton>Rand</guibutton></para></entry>
                             <entry><para>0,14</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    </sect2> 
    <sect2 id="gcalctool-programming-mode">
      <title>To Perform Programming Calculations</title>
      <para>To change to Programming mode, choose 
        <menuchoice> 
          <guimenu>View</guimenu> 
          <guimenuitem>Programming</guimenuitem> 
        </menuchoice>. 
      </para>
    <para>When you change to Programming mode, the following widget is displayed above the Base and Advanced mode buttons:</para>

    <!-- ==== Figure ==== -->
      <figure id="gcalctool-FIG-programming"> 
        <title><application>gcalctool</application> Programming Mode Buttons</title> 
        <screenshot> 
          <mediaobject> 
            <imageobject><imagedata fileref="figures/gcalctool_programming_window.png" format="PNG"/> 
            </imageobject>
            <textobject> 
              <phrase>Shows <application>gcalctool</application> Programming mode buttons.  </phrase> 
            </textobject> 
          </mediaobject> 
        </screenshot> 
      </figure>
    <!-- ==== End of Figure ==== -->
    <sect3 id="gcalctool-num-base"> 
      <title>To Set the Numeric Base</title> 
      <para>To set the numeric base, select one of the buttons described in <xref linkend="gcalctool-TBL-num-base"/>. </para>
                <table id="gcalctool-TBL-num-base" frame="all">
                  <title>Setting the Numeric Base</title> 
                  <tgroup cols="3" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Binary Base</para> </entry>
                             <entry><para><guibutton>Bin</guibutton></para></entry>
                             <entry><para>Sets the numeric base to binary, that is, base 2.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Octal Base</para> </entry>
                             <entry><para><guibutton>Oct</guibutton></para></entry>
                             <entry><para>Sets the numeric base to octal, that is, base 8.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Decimal Base</para> </entry>
                             <entry><para><guibutton>Dec</guibutton></para></entry>
                             <entry><para>Sets the numeric base to decimal, that is, base 10. Decimal is the default numeric base. If you change from Programming mode to another mode, <application>gcalctool</application> automatically sets the numeric base to decimal.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Hexadecimal Base</para> </entry>
                             <entry><para><guibutton>Exa</guibutton></para></entry>
                             <entry><para>Sets the numeric base to hexadecimal, that is, base 16.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-word-length">
      <title>To Set the Word Length</title>
      <para>The word length can be altered, to make the bitwise functions behave differently. To set the word length, select one of the buttons described in <xref linkend="gcalctool-TBL-word-length"/>. </para>
                <table id="gcalctool-TBL-word-length" frame="all">
                  <title>Setting the Word Length</title>
                  <tgroup cols="3" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>64 bit word</para> </entry>
                             <entry><para><guibutton>64 bit</guibutton></para></entry>
                             <entry><para>Sets the word length to 64 bits. 64 bits is the default word length.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>32 bit word</para> </entry>
                             <entry><para><guibutton>32 bit</guibutton></para></entry>
                             <entry><para>Sets the word length to 32 bits.</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>16 bit word</para> </entry>
                             <entry><para><guibutton>16 bit</guibutton></para></entry>
                             <entry><para>Sets the word length to 16 bits.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-calc-bit-manipulation-ext">
      <title>To Perform Bit Manipulations on Integers</title>
      <para>If the calculator display shows an integer value, then each of the bits in that integer value is displayed as a collection of 0s and 1s in the Bit Editor. By clicking on any of these individual bits, their value can be toggled, causing the displayed integer value to be adjusted accordingly.</para>
    </sect3>
    <sect3 id="gcalctool-logic-calc"> 
      <title>To Perform Bitwise Calculations</title> 
      <para>To perform bitwise calculations, use the buttons described in <xref linkend="gcalctool-TBL-logic-calc"/>. </para>
                <table id="gcalctool-TBL-logic-calc" frame="all">
                  <title>Performing Bitwise Calculations</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Bitwise OR</para> </entry>
                             <entry><para><guibutton>O</guibutton></para></entry>
                             <entry><para>Performs a bitwise OR operation on the current value in the display area and the next number that you enter.</para></entry>
                             <entry><para>10001000 <guibutton>O</guibutton> 00010001</para></entry>
                             <entry><para>10011001</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Bitwise AND</para> </entry>
                             <entry><para><guibutton>AND</guibutton></para></entry>
                             <entry><para>Performs a bitwise AND operation on the current value in the display area and the next number that you enter.</para></entry>
                             <entry><para>10101010 <guibutton>E</guibutton> 00110011</para></entry>
                             <entry><para>100010</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Bitwise NOT</para> </entry>
                             <entry><para><guibutton>NOT</guibutton></para></entry>
                             <entry><para>Performs a bitwise NOT operation on the current value in the display area, using the word size configured in <xref linkend="gcalctool-word-length"/>.</para></entry>
                             <entry><para><guibutton>NOT</guibutton> 1357ACE</para></entry>
                             <entry><para>FECA8531</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Bitwise XOR</para> </entry>
                             <entry><para><guibutton>XOR</guibutton></para></entry>
                             <entry><para>Performs a bitwise XOR operation on the current value in the display area and the next number that you enter.</para></entry>
                             <entry><para>1100 <guibutton>XOR</guibutton> 1010</para></entry>
                             <entry><para>110</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Bitwise XNOR</para> </entry>
                             <entry><para><guibutton>XNOR</guibutton></para></entry>
                             <entry><para>Performs a bitwise XNOR operation on the current value in the display area and the next number that you enter.</para></entry>
                             <entry><para>1100 <guibutton>XNOR</guibutton> 1010</para></entry>
                             <entry><para>1001</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-num-manip"> 
      <title>To Manipulate Binary Numbers</title> 
      <para>To manipulate binary numbers, use the buttons described in <xref linkend="gcalctool-TBL-num-manip"/>. </para>
                <table id="gcalctool-TBL-num-manip" frame="all">
                  <title>Manipulating Binary Numbers</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Left Shift <replaceable>n</replaceable></para> </entry>
                             <entry><para><guibutton>&lt;</guibutton></para></entry>
                             <entry><para>Shifts the current value in the display area, the specified number of places to the left. Click <guibutton>&lt;</guibutton>, then select the number of shift places from the popup menu. The number can be shifted up to 15 places left. </para></entry>
                             <entry><para>111 <guibutton>&lt;</guibutton> <guilabel>1 place</guilabel></para></entry>
                             <entry><para>1110</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Right Shift <replaceable>n</replaceable></para> </entry>
                             <entry><para><guibutton>&gt;</guibutton></para></entry>
                             <entry><para>Shifts the current value in the display area, the specified number of places to the right. Click <guibutton>&gt;</guibutton>, then select the number of shift places from the popup menu. The number can be shifted up to 15 places right.</para></entry>
                             <entry><para>1011 <guibutton>&gt;</guibutton> <guilabel>1 place</guilabel></para></entry>
                             <entry><para>101</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Truncating a number</para> </entry>
                             <entry><para><guibutton>Trunc</guibutton></para></entry>
                             <entry><para>Truncates the current value in the display area to the word size configured in <xref linkend="gcalctool-word-length"/>.</para></entry>
                             <entry><para>FFFFFFFFFF <guibutton>Trunc</guibutton></para></entry>
                             <entry><para>FFFFFFFF</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Get the 1's complement</para> </entry>
                             <entry><para><guibutton>1's</guibutton></para></entry>
                             <entry><para>Calculates the 1's complement for the current value in the display area, using the word size configured in <xref linkend="gcalctool-word-length"/>.</para></entry>
                             <entry><para>D723 <guibutton>1's</guibutton></para></entry>
                             <entry><para>FFFF28DC</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>Get the 2's complement</para> </entry>
                             <entry><para><guibutton>2's</guibutton></para></entry>
                             <entry><para>Calculates the 2's complement for the current value in the display area, using the word size configured in <xref linkend="gcalctool-word-length"/>.</para></entry>
                             <entry><para>D723 <guibutton>2's</guibutton></para></entry>
                             <entry><para>FFFF28DD</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
      <para>If you use keyboard shortcuts, you can use the keyboard to specify the number of places to shift, as shown in the following examples: </para>
      <informaltable frame="all">
        <tgroup cols="2" colsep="1" rowsep="1">
          <colspec colname="COLSPEC0" colwidth="50*"/>
          <colspec colname="COLSPEC1" colwidth="50*"/>
          <thead>
            <row valign="top">
              <entry colname="COLSPEC0">
                <para>Keyboard Entry</para></entry>
              <entry colname="COLSPEC1">
                <para>Descripcion</para></entry>
            </row>
          </thead>
          <tbody>
            <row valign="top">
              <entry><para><keycap>&lt;</keycap> <keycap>4</keycap></para></entry>
              <entry><para>Shifts the current binary value in the display area 4 places to the left.</para></entry>
            </row>
            <row valign="top">
              <entry><para><keycap>&gt;</keycap> <keycap>4</keycap></para></entry>
              <entry><para>Shifts the current binary value in the display area 4 places to the right.</para></entry>
            </row>
          </tbody> 
        </tgroup>
      </informaltable>

    </sect3>
        <sect3 id="gcalctool-misc-prog">
      <title>To Perform Miscellaneous Programming Calculations</title> 
      <para>To perform miscellaneous programming calculations, use the buttons described in <xref linkend="gcalctool-TBL-misc-prog"/>. </para>
                <table id="gcalctool-TBL-misc-prog" frame="all">
                  <title>Performing Miscellaneous Programming Calculations</title> 
                  <tgroup cols="5" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <colspec colname="COLSPEC4" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Descripcion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>Exemple</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>Resulta</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Hexadecimal Numerals</para> </entry>
                             <entry><para><guibutton>A</guibutton> to <guibutton>F</guibutton> inclusive</para></entry>
                             <entry><para>These numerals are available in hexadecimal base only.</para></entry>
                             <entry><para><guibutton>B</guibutton></para></entry>
                             <entry><para>B</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
         </sect3>
    </sect2>
<!-- ============= Undo and Redo ======================== -->
  <sect2 id="gcalctool-undo-redo">
    <title>To Undo and Redo</title>
                <para>To undo your previous action, choose
                  <menuchoice>
                         <guimenu>Edit</guimenu>
                         <guimenuitem>Undo</guimenuitem>
                  </menuchoice>.  You can undo up to 15 past actions.</para>
                <para>If you want to redo an action you have just undone, choose
                  <menuchoice>
                         <guimenu>Edit</guimenu>
                         <guimenuitem>Redo</guimenuitem>
                  </menuchoice>. You can redo up to 15 undone actions.</para>
  </sect2>
<!-- ============= Quitting ============================= -->
  <sect2 id="gcalctool-quit"> 
    <title>To Quit</title> 
                <para>To quit <application>gcalctool</application>, choose
                  <menuchoice>
                         <guimenu>Calculator</guimenu>
                         <guimenuitem>Quit</guimenuitem>
                  </menuchoice>.  </para>
                <para>When you quit <application>gcalctool</application>, the current values of the following settings are stored and automatically applied the next time you start <application>gcalctool</application>: </para>
                  <itemizedlist>
                    <listitem><para>Mode: <link linkend="gcalctool-basic-mode">Basic</link>,  <link linkend="gcalctool-advanced-mode">Advanced</link>, <link linkend="gcalctool-financial-mode">Financial</link>, or <link linkend="gcalctool-scientific-mode">Scientific</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-set-acc">Precision</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-mem-reg">Memory Registers window</link> displayed or not displayed, plus the contents of each memory register</para></listitem>
                    <listitem><para><link linkend="gcalctool-num-base">Numeric base</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-display-type">Display type</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-trig-type">Trigonometric type</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-set-acc">Show Trailing Zeroes</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-calc-functions-separator">Show Thousands Separator</link></para></listitem>
                  </itemizedlist>
  </sect2>
  </sect1>
<!-- ============= Technical Information ============================= -->
  <sect1 id="gcalctool-tech-info">
         <title>Technical Information</title>

         <sect2 id="gcalctool-recognize-error">
                <title>Error Conditions</title>
                <para>If you perform an invalid calculation, <application>gcalctool</application> indicates the error condition as follows:
<itemizedlist>
<listitem><para>Displays the word <literal>Error</literal> in the display area.</para></listitem>
<listitem><para>Displays an error message in the status bar.</para></listitem>
<listitem><para>Makes all calculator buttons unavailable, except <guibutton>Clr</guibutton>.</para></listitem>
<listitem><para>Makes all calculator options unavailable.</para></listitem>
<listitem><para>Makes all calculator menu items unavailable, except <menuchoice><guimenu>Calculator</guimenu><guimenuitem>Quit</guimenuitem></menuchoice> and <menuchoice><guimenu>Help</guimenu><guimenuitem>Contents</guimenuitem></menuchoice>.</para></listitem>
</itemizedlist>
</para>
<para>To clear the error condition, click <guibutton>Clr</guibutton> or press <keycombo><keycap>Shift</keycap><keycap>Delete</keycap></keycombo>.</para>
         </sect2>

         <sect2 id="gcalctool-change-modes">
                <title>Changing Modes</title>
                <para>If the user tries to change modes when a partial
calculation is being displayed, a warning dialog is displayed, telling
the user that the current calculation will be cleared, and the base will 
be reset to decimal.</para>
                <para>There is a checkbox present, that if checked, prevents the dialog from being shown again.</para>
                <para>If the user presses the <guibutton>Cancel</guibutton> button, the change mode operation is cancelled. If the user presses the <guibutton>Change Mode</guibutton> button, the mode is changed and has the following side-effects:
<itemizedlist>
<listitem><para>Clears the display.</para></listitem>
   <listitem><para>Sets the base to decimal.</para></listitem>
   <listitem><para>Sets the numeric display to fixed.</para></listitem>
   <listitem><para>Sets the accuracy to nine places after the numeric point.</para></listitem>
   <listitem><para>Clears the display of the thousands separator.</para></listitem>
   <listitem><para>Clears the display of trailing zeroes after the numeric point.</para></listitem>
   <listitem><para>Dismisses the register window if the new mode is Basic.</para></listitem>
</itemizedlist>
</para>
         </sect2>

         <sect2 id="gcalctool-changing-display-area">
                <title>Changing The Display Area</title>
                <para>It is possible to use the mouse to click on the display area and edit it.</para>
                <para>All the normal keyboard shortcuts will work, plus the addition of:
<itemizedlist>
    <listitem><para><keycombo><keycap>Ctrl</keycap><keycap>Delete</keycap></keycombo> which will delete the character to the right of the text cursor</para></listitem>
    <listitem><para><keycap>Home</keycap> which moves the text cursor to the beginning of the display area</para></listitem> 
    <listitem><para><keycap>End</keycap> which moves the text cursor to the end of the display area</para></listitem> 
</itemizedlist>
</para>
         </sect2>

  </sect1>
<!-- ============= Keyboard Shortcuts ============================= -->
  <sect1 id="gcalctool-keyboard-shortcut"> 
    <title>Quick Reference: Keyboard Shortcuts</title> 
                <para><xref linkend="gcalctool-TBL-keyboard-shortcut-button"/>, <xref linkend="gcalctool-TBL-keyboard-shortcut-sci-options"/>, and <xref linkend="gcalctool-TBL-keyboard-shortcut-menu"/> provide a quick reference for all of the <application>gcalctool</application> keyboard shortcuts.</para>
                <para>When you use the keyboard shortcut for any of the calculator
                      buttons that have a menu associated with them, that menu is displayed.
                      You can then use the arrow keys to select a menu item or the menu item's shortcut.</para>
                <table id="gcalctool-TBL-keyboard-shortcut-button" frame="all">
                  <title>Quick Reference for Keyboard Shortcuts of <application>gcalctool</application> Buttons</title> 
                  <tgroup cols="4" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Keyboard Shortcut</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Boton</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>See</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para><keycap>0</keycap> to <keycap>9</keycap> inclusive</para></entry>
                             <entry><para><guibutton>0</guibutton> to <guibutton>9</guibutton> inclusive</para></entry>
                             <entry><para>Numerals</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-simple-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>A</keycap> </para></entry>
                             <entry><para><guibutton>Acc</guibutton> </para></entry>
                             <entry><para>Precision</para> </entry>
                             <entry><para><xref linkend="gcalctool-set-acc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>a</keycap> </para></entry>
                             <entry><para><guibutton>A</guibutton> </para></entry>
                             <entry><para>Hexadecimal numerals</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>b</keycap> </para></entry>
                             <entry><para><guibutton>B</guibutton> </para></entry>
                             <entry><para>Hexadecimal numerals</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>C</keycap></para></entry>
                             <entry><para><guibutton>+/-</guibutton></para></entry>
                             <entry><para>Change the arithmetic sign</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>c</keycap> </para></entry>
                             <entry><para><guibutton>C</guibutton> </para></entry>
                             <entry><para>Hexadecimal numerals</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>D</keycap></para></entry>
                             <entry><para><guibutton>Ddb</guibutton></para></entry>
                             <entry><para>Double-declining depreciation</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>d</keycap> </para></entry>
                             <entry><para><guibutton>D</guibutton> </para></entry>
                             <entry><para>Hexadecimal numerals</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>E</keycap> </para></entry>
                             <entry><para><guibutton>Exp</guibutton> </para></entry>
                             <entry><para>Exponential</para> </entry>
                             <entry><para><xref linkend="gcalctool-enter-exp"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>e</keycap> </para></entry>
                             <entry><para><guibutton>E</guibutton> </para></entry>
                             <entry><para>Hexadecimal numerals</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>F</keycap> </para></entry>
                             <entry><para><guibutton>Fun</guibutton> </para></entry>
                             <entry><para>Foncion</para> </entry>
                             <entry><para><xref linkend="gcalctool-edit-func"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>f</keycap> </para></entry>
                             <entry><para><guibutton>F</guibutton> </para></entry>
                             <entry><para>Hexadecimal numerals</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>G</keycap></para></entry>
                             <entry><para>10<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>10 to the <replaceable>x</replaceable> power</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>g</keycap></para></entry>
                             <entry><para><guibutton>Log</guibutton></para></entry>
                             <entry><para>Common base 10 logarithm</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logs-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>H</keycap></para></entry>
                             <entry><para>2<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>2 to the <replaceable>x</replaceable> power</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>h</keycap></para></entry>
                             <entry><para>Log<subscript>2</subscript></para></entry>
                             <entry><para>Common base 2 logarithm</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logs-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>I</keycap></para></entry>
                             <entry><para><guibutton>Gpm</guibutton></para></entry>
                             <entry><para>Gross Profit Margin</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>i</keycap></para></entry>
                             <entry><para><guibutton>Int</guibutton></para></entry>
                             <entry><para>Integer portion</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>J</keycap></para></entry>
                             <entry><para>Cos<superscript>-1</superscript></para></entry>
                             <entry><para>Inverse Cosine</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>j</keycap></para></entry>
                             <entry><para><guibutton>Cos</guibutton></para></entry>
                             <entry><para>Cosinus</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>K</keycap></para></entry>
                             <entry><para>Sin<superscript>-1</superscript></para></entry>
                             <entry><para>Inverse Sine</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>k</keycap></para></entry>
                             <entry><para><guibutton>Sin</guibutton></para></entry>
                             <entry><para>Sinus</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>l</keycap></para></entry>
                             <entry><para><guibutton>Sln</guibutton></para></entry>
                             <entry><para>Straight-line depreciation</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>M</keycap></para></entry>
                             <entry><para><guibutton>Mod</guibutton></para></entry>
                             <entry><para>Modulus Division</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>m</keycap></para></entry>
                             <entry><para><guibutton>Ctrm</guibutton></para></entry>
                             <entry><para>Compounding term</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>N</keycap></para></entry>
                             <entry><para>e<superscript><replaceable>x</replaceable></superscript></para></entry>
                             <entry><para>e to the <replaceable>x</replaceable> power</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>n</keycap></para></entry>
                             <entry><para><guibutton>Ln</guibutton></para></entry>
                             <entry><para>Natural logarithm</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logs-calc"/></para> </entry>
                           </row>
                                                   <row valign="top">
                                                         <entry><para><keycap>O</keycap></para></entry>
                             <entry><para><replaceable>x</replaceable><superscript>1/<replaceable>y</replaceable></superscript></para></entry>
                             <entry><para>x to the reciprocal<replaceable>y</replaceable> power</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>o</keycap> or <keycap>^</keycap></para></entry>
                             <entry><para><replaceable>x</replaceable><superscript><replaceable>y</replaceable></superscript></para></entry>
                             <entry><para>x to the <replaceable>y</replaceable> power</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>P</keycap></para></entry>
                             <entry><para><guibutton>Pmt</guibutton></para></entry>
                             <entry><para>Periodic payment</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>p</keycap></para></entry>
                             <entry><para><guibutton>Pv</guibutton></para></entry>
                             <entry><para>Present value</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>R</keycap></para></entry>
                             <entry><para><guibutton>Rcl</guibutton></para></entry>
                             <entry><para>Retrieve value from memory register</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-mem-reg"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>r</keycap></para></entry>
                             <entry><para><guibutton>1/<replaceable>x</replaceable></guibutton></para></entry>
                             <entry><para>Reciprocal</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>E</keycap></para></entry>
                             <entry><para><guibutton>Sto</guibutton></para></entry>
                             <entry><para>Store value in memory register</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-mem-reg"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>s</keycap></para></entry>
                             <entry><para><guibutton>Sqrt</guibutton></para></entry>
                             <entry><para>Square root</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>T</keycap></para></entry>
                             <entry><para><guibutton>Taus</guibutton></para></entry>
                             <entry><para>Periodic interest rate</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>t</keycap></para></entry>
                             <entry><para><guibutton>Term</guibutton></para></entry>
                             <entry><para>Payment period</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>u</keycap></para></entry>
                             <entry><para><guibutton>Abs</guibutton></para></entry>
                             <entry><para>Absolute value</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>v</keycap></para></entry>
                             <entry><para><guibutton>Fv</guibutton></para></entry>
                             <entry><para>Future value</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>W</keycap></para></entry>
                             <entry><para>Tan<superscript>-1</superscript></para></entry>
                             <entry><para>Inverse Tan</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>w</keycap></para></entry>
                             <entry><para><guibutton>Tan</guibutton></para></entry>
                             <entry><para>Tan</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>X</keycap></para></entry>
                             <entry><para><guibutton>Exch</guibutton></para></entry>
                             <entry><para>Exchange memory register value and displayed value</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-mem-reg"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>x</keycap></para></entry>
                             <entry><para><guibutton>Xor</guibutton></para></entry>
                             <entry><para>Bitwise XOR</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logic-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>O</keycap></para></entry>
                             <entry><para><guibutton>Syd</guibutton></para></entry>
                             <entry><para>Sum-of-the-years'-digits depreciation</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-financial-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>Z</keycap></para></entry>
                             <entry><para><guibutton>2's</guibutton></para></entry>
                             <entry><para>2's complement</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-manip"/></para></entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>z</keycap></para></entry>
                             <entry><para><guibutton>1's</guibutton></para></entry>
                             <entry><para>1's complement</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-manip"/></para></entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>!</keycap></para></entry>
                             <entry><para><guibutton><replaceable>x</replaceable>!</guibutton></para></entry>
                             <entry><para><replaceable>x</replaceable> factorial</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>#</keycap> </para></entry>
                             <entry><para><guibutton>Con</guibutton> </para></entry>
                             <entry><para>Constant value</para> </entry>
                             <entry><para><xref linkend="gcalctool-edit-const"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>%</keycap></para></entry>
                             <entry><para><guibutton>%</guibutton></para></entry>
                             <entry><para>Percentatge</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>&amp;</keycap></para></entry>
                             <entry><para><guibutton>E</guibutton></para></entry>
                             <entry><para>Bitwise AND</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logic-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>(</keycap> and <keycap>)</keycap></para></entry>
                             <entry><para><guibutton>(</guibutton> and <guibutton>)</guibutton></para></entry>
                             <entry><para>Parentheses</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>*</keycap></para></entry>
                             <entry><para><guibutton>*</guibutton></para></entry>
                             <entry><para>Multiplicacion</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-simple-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>+</keycap></para></entry>
                             <entry><para><guibutton>+</guibutton></para></entry>
                             <entry><para>Adicion</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-simple-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>-</keycap></para></entry>
                             <entry><para><guibutton>-</guibutton></para></entry>
                             <entry><para>Sostraccion</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-simple-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>.</keycap></para></entry>
                             <entry><para><guibutton>.</guibutton></para></entry>
                             <entry><para>Numeric point</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-simple-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>/</keycap></para></entry>
                             <entry><para><guibutton>/</guibutton></para></entry>
                             <entry><para>Division</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-simple-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>:</keycap></para></entry>
                             <entry><para><guibutton>Frac</guibutton></para></entry>
                             <entry><para>Fractional portion</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>&lt;</keycap></para></entry>
                             <entry><para><guibutton>&lt;</guibutton></para></entry>
                             <entry><para>Left shift <replaceable>n</replaceable></para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-manip"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>=</keycap> or <keycap>Return</keycap></para></entry>
                             <entry><para><guibutton>=</guibutton></para></entry>
                             <entry><para>Calculate a result</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-simple-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>&gt;</keycap></para></entry>
                             <entry><para><guibutton>&gt;</guibutton></para></entry>
                             <entry><para>Right shift <replaceable>n</replaceable></para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-manip"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>?</keycap></para></entry>
                             <entry><para><guibutton>Rand</guibutton></para></entry>
                             <entry><para>Random number generator</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-misc-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>@</keycap></para></entry>
                             <entry><para><replaceable>x</replaceable><superscript>2</superscript></para></entry>
                             <entry><para>Carrat</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>{</keycap></para></entry>
                             <entry><para><guibutton>Xnor</guibutton></para></entry>
                             <entry><para>Bitwise XNOR</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logic-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>[</keycap></para></entry>
                             <entry><para><guibutton>Trunc</guibutton></para></entry>
                             <entry><para>Truncates the number</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-manip"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>|</keycap></para></entry>
                             <entry><para><guibutton>O</guibutton></para></entry>
                             <entry><para>Bitwise OR</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logic-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>~</keycap></para></entry>
                             <entry><para><guibutton>Not</guibutton></para></entry>
                             <entry><para>Bitwise NOT</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-logic-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>Retorn enrèire</keycap></para></entry>
                             <entry><para><guibutton>Bksp</guibutton></para></entry>
                             <entry><para>Retorn enrèire</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-erase-char"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>Esc</keycap> or </para>
                                    <para><keycombo><keycap>Ctrl</keycap><keycap>Retorn enrèire</keycap></keycombo></para></entry>
                             <entry><para><guibutton>CE</guibutton></para></entry>
                             <entry><para>Clear entry</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-erase-char"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Shift</keycap><keycap>Suprimir</keycap></keycombo></para></entry>
                             <entry><para><guibutton>Clr</guibutton></para></entry>
                             <entry><para>Netejar</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-erase-char"/></para> </entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
                <table id="gcalctool-TBL-keyboard-shortcut-sci-options" frame="all">
                  <title>Quick Reference for Keyboard Shortcuts of <application>gcalctool</application> Scientific Mode Options</title> 
                  <tgroup cols="4" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Keyboard Shortcut</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Opcion</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>See</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>1</keycap></keycombo></para></entry>
                             <entry><para><guilabel>16 bit</guilabel></para></entry>
                             <entry><para>Set the word size to 16 bits.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-word-length"/></para></entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>3</keycap></keycombo></para></entry>
                             <entry><para><guilabel>32 bit</guilabel></para></entry>
                             <entry><para>Set the word size to 32 bits.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-word-length"/></para></entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>6</keycap></keycombo></para></entry>
                             <entry><para><guilabel>64 bit</guilabel></para></entry>
                             <entry><para>Set the word size to 64 bits.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-word-length"/></para></entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>a</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Gradians</guilabel></para></entry>
                             <entry><para>Set the trigonometric type to gradians.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-type"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>b</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Bin</guilabel></para></entry>
                             <entry><para>Set the numeric base to binary.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-base"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>d</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Dec</guilabel></para></entry>
                             <entry><para>Set the numeric base to decimal.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-base"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>f</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Fix</guilabel></para></entry>
                             <entry><para>Set the display type to fixed-point format.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-display-type"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>g</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Grases</guilabel></para></entry>
                             <entry><para>Set the trigonometric type to degrees.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-type"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>i</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Inv</guilabel></para></entry>
                             <entry><para>Select the inverse option for use with the trigonometric functions.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-options"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>n</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Eng</guilabel></para></entry>
                             <entry><para>Set the display type to engineering format.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-display-type"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>o</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Oct</guilabel></para></entry>
                             <entry><para>Set the numeric base to octal.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-base"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>r</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Radians</guilabel></para></entry>
                             <entry><para>Set the trigonometric type to radians.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-type"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>s</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Sci</guilabel></para></entry>
                             <entry><para>Set the display type to scientific format.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-display-type"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>x</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Exa</guilabel></para></entry>
                             <entry><para>Set the numeric base to hexadecimal.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-num-base"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Alt</keycap><keycap>y</keycap></keycombo></para></entry>
                             <entry><para><guilabel>Hyp</guilabel></para></entry>
                             <entry><para>Select the hyperbolic option for use with the trigonometric functions.</para></entry>
                             <entry><para><xref linkend="gcalctool-TBL-trig-options"/></para> </entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
                <table id="gcalctool-TBL-keyboard-shortcut-menu" frame="all">
                  <title>Quick Reference for Keyboard Shortcuts of <application>gcalctool</application> Menu Items</title> 
                  <tgroup cols="4" colsep="1" rowsep="1">
                         <colspec colname="COLSPEC0" colwidth="50*"/>
                         <colspec colname="COLSPEC1"/>
                         <colspec colname="COLSPEC2" colwidth="50*"/>
                         <colspec colname="COLSPEC3" colwidth="50*"/>
                         <thead>
                                <row valign="top">
                                  <entry colname="COLSPEC0">
                                         <para>Keyboard Shortcut</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>Menu Item</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>Foncion</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>See</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>b</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Visualizacion</guimenu> <guimenuitem>Basic</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Change to Basic mode</para> </entry>
                             <entry><para><xref linkend="gcalctool-basic-mode"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>c</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Edicion</guimenu> <guimenuitem>Copiar</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Copy the current value in the display area to the clipboard</para> </entry>
                             <entry><para><xref linkend="gcalctool-calc-functions"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>f</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Visualizacion</guimenu> <guimenuitem>Financièr</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Change to Financial mode</para> </entry>
                             <entry><para><xref linkend="gcalctool-financial-mode"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>h</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Ajuda</guimenu> <guimenuitem>Ensenhador</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Display the <application>gcalctool</application> online help </para> </entry>
                             <entry><para><xref linkend="gcalctool-intro"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>i</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Edicion</guimenu> <guimenuitem>Inserir una valor ASCII</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Display the <guilabel>Insert ASCII Value</guilabel> dialog</para> </entry>
                             <entry><para><xref linkend="gcalctool-ins-ascii"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>k</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Visualizacion</guimenu> <guimenuitem>Show Thousands Separator</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Display the thousands separator
</para> </entry>
                             <entry><para><xref linkend="gcalctool-calc-functions-separator"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>m</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Visualizacion</guimenu> <guimenuitem>Memory Registers</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Display the <guilabel>Memory Registers</guilabel> window</para> </entry>
                             <entry><para><xref linkend="gcalctool-mem-reg"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>p</keycap></keycombo></para></entry>
                                                         <entry><para> <menuchoice> <guimenu>Visualizacion</guimenu> <guimenuitem>Programming</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Change to Programming mode</para> </entry>
                             <entry><para><xref linkend="gcalctool-programming-mode"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>q</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Calculeta</guimenu> <guimenuitem>Quitar</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Quit the <application>gcalctool</application> application</para> </entry>
                             <entry><para><xref linkend="gcalctool-quit"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>s</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Visualizacion</guimenu> <guimenuitem>Scientific</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Change to Scientific mode</para> </entry>
                             <entry><para><xref linkend="gcalctool-scientific-mode"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>t</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Visualizacion</guimenu> <guimenuitem>Show Trailing Zeroes</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Show trailing zeroes</para> </entry>
                             <entry><para><xref linkend="gcalctool-set-acc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>v</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Edicion</guimenu> <guimenuitem>Pegar</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Paste the current value in the clipboard to the display area </para> </entry>
                             <entry><para><xref linkend="gcalctool-calc-functions"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>z</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Edicion</guimenu> <guimenuitem>Undo</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Undo previous action</para> </entry>
                             <entry><para><xref linkend="gcalctool-undo-redo"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycombo><keycap>Shift</keycap><keycap>Ctrl</keycap><keycap>z</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>Edicion</guimenu> <guimenuitem>Redo</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>Redo an undone action</para> </entry>
                             <entry><para><xref linkend="gcalctool-undo-redo"/></para> </entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
  </sect1>
</article>
