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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;">
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  <articleinfo> 
    <title><application>gcalctool</application> Manual</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> 
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   <year>2003</year>
   <holder>ME-THE-TRANSLATOR (Latin translation)</holder>
  </copyright>

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    <publisher role="maintainer"> 
      <publishername> GNOME Documentation Project </publishername> 
    </publisher> 

     <legalnotice id="legalnotice">
	<para>对于本文档的复制、分发和/或修改必须遵循自由软件基金会 (Free Software Foundation) 发布的 GNU 自由文档许可证 (GFDL) 版本 1.1 或更高版本， 该许可证没有固定的部分、没有封面和背页文本。您可以在此<ulink type="help" url="ghelp:fdl">链接</ulink>上或在随本手册一起分发的 COPYING-DOCS 文件中找到 GFDL 的副本。</para>
         <para>本手册是在 GFDL 许可之下分发的 GNOME 手册集合的一部分。如果想要 单独分发此手册，可以在手册中添加该许可证的一份副本然后分发，如该许可证的 第 6 部分所述。</para>

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		  <para>无论在任何情况以及在任何法律理论下，本文档或文档修改版本的作 者、最初的编写者、任何撰写人或任何分发者，或者任意这些方的任何提供 者都不对任何人由于使用本文档或文档修改版本引起或带来的任何直接的、间接的、 特殊的、偶然的或继发的损失承担任何民事（包括疏忽）、合同或其它方面的 责任，这些损失包括但不限于信誉损失、工作停止、计算机失败或故障，或任 何以及所有其它损失或由此引发的或与之相关的损失，即使这些方已被告知存 在出现此类损失的可能性时也是如此。</para>
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  </legalnotice>


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

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                          <address> <email>translator@gnome.org</email> </address> 
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    </authorgroup>

    <revhistory>
    <revision> 
                <revnumber>Calculator Manual V2.9</revnumber> 
                <date>March 2005</date> 
                <revdescription> 
                          <para role="author">Sun Java Desktop System Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>Calculator Manual V2.8</revnumber> 
                <date>August 2004</date> 
                <revdescription> 
                          <para role="author">Sun Java Desktop System Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.7</revnumber> 
                <date>February 2004</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team</para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool Manual V2.6</revnumber> 
                <date>October 2003</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool 手册 V2.5</revnumber> 
                <date>July 2003</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool 手册 V2.4</revnumber> 
                <date>2003 年 6 月</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool 手册 V2.3</revnumber> 
                <date>2003 年 4 月</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool 手册 V2.2</revnumber> 
                <date>2003 年 4 月</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool 手册 V2.1</revnumber> 
                <date>2003 年 3 月</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
      <revision> 
                <revnumber>gcalctool 手册 V2.0</revnumber> 
                <date>2003 年 3 月</date> 
                <revdescription> 
                          <para role="author">Sun GNOME Documentation Team
                          </para>
                          <para role="publisher">GNOME Documentation Project</para>
                </revdescription> 
      </revision> 
    </revhistory> 

    <releaseinfo>This manual describes version 5.5.37 of Calculator.
    </releaseinfo> 
    <legalnotice> 
      <title>反馈</title> 
      <para>要报告关于 <application>Calculator</application> 应用程序或本手册的错误或提出建议，请遵循 <ulink url="ghelp:gnome-feedback" type="help">GNOME 反馈页</ulink>中的指导。</para>
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    </legalnotice> 
  </articleinfo> 

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

<!-- ============= Document Body ============================= -->
<!-- ============= Introduction ============================== -->
  <sect1 id="gcalctool-intro"> 
    <title>简介</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">&ldquo;基本&rdquo;</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">Advanced </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">&ldquo;财务&rdquo;</link></term>
        <listitem><para>提供若干复杂的财务功能。</para></listitem>
        </varlistentry>
        <varlistentry>
        <term><link linkend="gcalctool-scientific-mode">&ldquo;科学&rdquo;</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>您可以在下列进位系统中使用 <application>Calculator</application>：</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>进位系统</para></entry>
              <entry colname="COLSPEC1" align="right">
                <para>进制</para></entry>
            </row>
          </thead> 
          <tbody> 
            <row valign="top">
              <entry><para>二进制</para></entry>
              <entry align="right"><para>2</para></entry>
            </row>
            <row valign="top">
              <entry><para>八进制</para></entry>
              <entry align="right"><para>8</para></entry>
            </row>
            <row valign="top">
              <entry><para>十进制</para></entry>
              <entry align="right"><para>10</para></entry>
            </row>
            <row valign="top">
              <entry><para>十六进制</para></entry>
              <entry align="right"><para>16</para></entry>
            </row>
          </tbody> 
        </tgroup>
      </informaltable>
                           
  </sect1>

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

  <sect1 id="gcalctool-get-start"> 
    <title>Getting Started</title> 
    <para>You can start <application>gcalctool</application> in the following ways:</para>
    <variablelist>
      <varlistentry>
        <term>Menu</term>
        <listitem>
          <para>
            Choose <menuchoice><guimenu>Accessories</guimenu><guimenuitem>Calculator</guimenuitem></menuchoice>.
          </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>Command line</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>Calculator</application>&ldquo;基本模式&rdquo;窗口</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>菜单栏</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>显示区域</term>
                         <listitem>
                                <para>The display area shows the numbers that you enter, and the results of calculations.</para>
                         </listitem>
                  </varlistentry>
                  <varlistentry> <term>模式区域</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>弹出菜单</term>
                         <listitem>
                <para><inlinemediaobject><imageobject><imagedata fileref="figures/gcalctool_menu_symbol.png" format="PNG"/></imageobject><textobject><phrase>显示弹出菜单符号。</phrase></textobject></inlinemediaobject> 符号（位于 <application>Calculator</application> 按钮上）指示单击按钮时显示一个弹出菜单。</para>
                         </listitem>
                  </varlistentry>
<varlistentry>
         <term>Status Bar</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>用法</title> 

    <!-- ================ Usage Subsection ================================ -->
    <sect2 id="gcalctool-calc-functions">
                <title>使用计算器功能</title> 
                <para>要执行一项运算，请使用以下方法之一：</para>
                <itemizedlist>
                  <listitem>
                         <para>单击 <application>Calculator</application> 按钮，输入数字和函数。</para>
                  </listitem>
                  <listitem>
                         <para>将焦点转到 <application>Calculator</application> 窗口，然后使用键盘或数字键盘指定要执行的运算。有关键盘快捷键的完整列表，请参见 <xref linkend="gcalctool-keyboard-shortcut"/>。</para>
                  </listitem>
                </itemizedlist>
                <para><application>Calculator</application> 应用程序自动以指数的形式显示超过 40 位的数字和小数。例如，下表显示了在使用十进制并精确到小数点后两位时显示的值：</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>显示</para></entry>
              <entry colname="COLSPEC1">
                <para>表示</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>有关如何以指数格式输入数字的信息，请参见 <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>要复制运算结果，请选择 <menuchoice><guimenu>&ldquo;编辑&rdquo;</guimenu><guimenuitem>&ldquo;复制&rdquo;</guimenuitem></menuchoice>。 您可以将该值粘贴到其它应用程序中。</para>

                <para>要将以前复制过的值粘贴到显示区域，请选择 <menuchoice><guimenu>&ldquo;编辑&rdquo;</guimenu><guimenuitem>&ldquo;粘贴&rdquo;</guimenuitem></menuchoice>。</para>
    </sect3>

    </sect2> 
    <!-- ================ Usage Subsection ================================ -->
   
    <sect2 id="gcalctool-basic-mode"> 
      <title>执行基本运算</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>执行简单运算</title> 
      <para>要执行简单的运算，请使用 <xref linkend="gcalctool-TBL-simple-calc"/> 中介绍的按钮。</para>
                <table id="gcalctool-TBL-simple-calc" frame="all">
                  <title>执行简单运算</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>数字</para> </entry>
                             <entry><para><guibutton>&ldquo;0&rdquo;</guibutton>至<guibutton>&ldquo;9&rdquo;</guibutton></para></entry>
                             <entry><para>在使用十进制和十六进制时，所有数字都可用。在使用八进制时，<guibutton>&ldquo;8&rdquo;</guibutton>和<guibutton>&ldquo;9&rdquo;</guibutton>不可用。在使用二进制时，仅<guibutton>&ldquo;0&rdquo;</guibutton>和<guibutton>&ldquo;1&rdquo;</guibutton>可用。默认进制为十进制。</para></entry>
                             <entry><para><guibutton>1</guibutton></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>小数点</para> </entry>
                             <entry><para><guibutton>.</guibutton></para></entry>
                             <entry><para>开始数字项的分数部分。</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>使用当前进制显示运算的结果。</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>加</para> </entry>
                             <entry><para><guibutton>+</guibutton></para></entry>
                             <entry><para>将显示区域中的当前值与您输入的下一个数字相加。</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>减</para> </entry>
                             <entry><para><guibutton>-</guibutton></para></entry>
                             <entry><para>从显示区域中的当前值中减去您输入的下一个数字。</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>乘</para> </entry>
                             <entry><para><guibutton>*</guibutton></para></entry>
                             <entry><para>将显示区域中的当前值与您输入的下一个数字相乘。</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>除</para> </entry>
                             <entry><para><guibutton>/</guibutton></para></entry>
                             <entry><para>用显示区域中的当前值除以您输入的下一个数字。</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>将正数更改为负数，或将负数更改为正数。</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>擦除字符</title> 
      <para>要擦除字符，请使用<xref linkend="gcalctool-TBL-erase-char"/>中介绍的按钮。</para>
                <table id="gcalctool-TBL-erase-char" frame="all">
                  <title>擦除字符</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Backspace</para> </entry>
                             <entry><para><guibutton>Bksp</guibutton></para></entry>
                             <entry><para>删除显示区域中最右端的字符。</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>清除项</para> </entry>
                             <entry><para><guibutton>CE</guibutton></para></entry>
                             <entry><para>删除显示区域中的当前值。</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>清除</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>显示 ASCII 值</title> 
                        <para>要显示字符的 ASCII 值，请选择 <menuchoice><guimenu>&ldquo;编辑&rdquo;</guimenu><guimenuitem>&ldquo;插入 ASCII 值&rdquo;</guimenuitem></menuchoice>。</para>
                        <para>即可显示&ldquo;插入 ASCII 值&rdquo;对话框。</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>百分数</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>倒数</para> </entry>
                             <entry><para><guibutton>1/<replaceable>x</replaceable></guibutton></para></entry>
                             <entry><para>用 1 除以显示区域中的当前值。</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>平方根</para> </entry>
                             <entry><para><guibutton>Sqrt</guibutton></para></entry>
                             <entry><para>计算显示区域中的当前值的平方根。</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>平方</para> </entry>
                             <entry><para><replaceable>x</replaceable><superscript>2</superscript></para></entry>
                             <entry><para>计算显示区域中的当前值的平方。</para></entry>
                             <entry><para>3 <replaceable>x</replaceable><superscript>2</superscript></para></entry>
                             <entry><para>9</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>整数部分</para> </entry>
                             <entry><para><guibutton>Int</guibutton></para></entry>
                             <entry><para>计算显示区域中的当前值的整数部分。</para></entry>
                             <entry><para>-23.45 <guibutton>Int</guibutton></para></entry>
                             <entry><para>-23</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>分数部分</para> </entry>
                             <entry><para><guibutton>Frac</guibutton></para></entry>
                             <entry><para>计算显示区域中的当前值的分数部分。</para></entry>
                             <entry><para>-23.45 <guibutton>Frac</guibutton></para></entry>
                             <entry><para>-0.45</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>绝对值</para> </entry>
                             <entry><para><guibutton>Abs</guibutton></para></entry>
                             <entry><para>计算显示区域中的当前值的绝对值。</para></entry>
                             <entry><para>-23.45 <guibutton>Abs</guibutton></para></entry>
                             <entry><para>23.45</para></entry>
                         </row>
                           <row valign="top">
                         <entry><para>圆括号</para> </entry>
                             <entry><para><guibutton>&ldquo;(&rdquo;</guibutton>和<guibutton>&ldquo;)&rdquo;</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>使用计算器存储寄存器</title> 
      <para>您可以将值存储于<guilabel>&ldquo;R0&rdquo;</guilabel>至<guilabel>&ldquo;R9&rdquo;</guilabel>这十个 <application>Calculator</application> 存储寄存器中的任何一个中。要显示存储寄存器，请选择 <menuchoice><guimenu>&ldquo;视图&rdquo;</guimenu><guimenuitem>&ldquo;存储寄存器&rdquo;</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"/> 介绍了可以使用的存储功能。</para>
                <table id="gcalctool-TBL-mem-reg" frame="all">
                  <title>存储功能</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>将值存储于存储寄存器中</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>在 <application>Calculator</application> 会话运行期间清除存储寄存器：</para>
                                     <orderedlist>
                                       <listitem><para>单击<guibutton>&ldquo;Clr&rdquo;</guibutton>。</para></listitem>
                                       <listitem><para>Click <guibutton>Sto</guibutton>.</para></listitem>
                                       <listitem><para>从弹出菜单中选择该存储寄存器。</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>从存储寄存器中检索值</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>交换存储寄存器值与显示值</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>如果使用键盘快捷键，则可以使用键盘指定该存储寄存器，如下面的示例所示：</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>键盘项</para></entry>
              <entry colname="COLSPEC1">
                <para>说明</para></entry>
            </row>
          </thead>
          <tbody> 
            <row valign="top">
              <entry><para><keycap>S</keycap> <keycap>2</keycap></para></entry>
              <entry><para>将显示区域的当前内容存储于存储寄存器<guilabel>&ldquo;R2&rdquo;</guilabel>中。</para></entry>
            </row>
            <row valign="top">
              <entry><para><keycap>R</keycap> <keycap>2</keycap></para></entry>
              <entry><para>将存储寄存器<guilabel>&ldquo;R2&rdquo;</guilabel>中的当前内容检索到显示区域中。</para></entry>
            </row>
            <row valign="top">
              <entry><para><keycap>X</keycap> <keycap>2</keycap></para></entry>
              <entry><para>将显示区域的当前内容与存储寄存器<guilabel>&ldquo;R2&rdquo;</guilabel>的内容进行交换。</para></entry>
            </row>
          </tbody> 
        </tgroup>
      </informaltable>
    </sect3>


    </sect2> 
    <!-- ================ Usage Subsection ================================ -->
         <sect2 id="gcalctool-financial-mode"> 
      <title>执行财务运算</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>Calculator</application>&ldquo;财务模式&rdquo;按钮</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>要执行财务运算，请使用 <xref linkend="gcalctool-TBL-financial-calc"/> 中介绍的按钮。</para>
                <table id="gcalctool-TBL-financial-calc" frame="all">
                  <title>执行财务运算</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>复利期间</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>分期利率</term>
                                <listitem><para>0.0075</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>终值</term>
                                <listitem><para>16000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>现值</term>
                                <listitem><para>8000</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>92.77</para>
                                    <para>投资变为原来的两倍需要 92.77 个月的时间。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>双倍余额递减折旧</para> </entry>
                             <entry><para><guibutton>Ddb</guibutton></para></entry>
                             <entry><para>使用双倍余额递减法计算资产在指定时间期间内的折旧额。</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>第四年的折旧额为 $790.12。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>终值</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>分期支付</term>
                                <listitem><para>4000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>分期利率</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>在第 20 年末，您的帐户余额为 $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>分期支付</para> </entry>
                             <entry><para><guibutton>Pmt</guibutton></para></entry>
                             <entry><para>计算一笔贷款的分期支付额，支付活动在每个支付期末进行。</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>分期利率</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>月支付额为 $1143.15。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>现值</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>您刚刚赢得一百万美元的奖金。这笔奖金分 20 年支付给您，每年 $50,000。每年的支付在年末进行。假如您每年收到 $50,000，您会将这笔钱按 9% 的年复利进行投资。</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>分期支付</term>
                                <listitem><para>50000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>分期利率</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>跨 20 年支付的 $1,000,000 合现值美元为 $456,427.28。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>分期利率</para> </entry>
                             <entry><para><guibutton>Rate</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>终值</term>
                                <listitem><para>30000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>现值</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>月利率为 0.678%。年利率为 0.678% * 12 = 8.14%。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>直线折旧</para> </entry>
                             <entry><para><guibutton>Sln</guibutton></para></entry>
                             <entry><para>计算某项资产在一段时间期限内的直线折旧额。可折旧值为<replaceable>原值</replaceable> - <replaceable>残值</replaceable>。直线折旧法在资产的使用期限内平均分担可折旧值。使用期限为资产计提折旧的期间数，通常为年数。</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>年折旧额为 $1183.33。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>年数总和折旧</para> </entry>
                             <entry><para><guibutton>Syd</guibutton></para></entry>
                             <entry><para>使用年数总和法计算资产在指定时间期限内的折旧额。这种折旧方法会加快折旧的速度，使早期阶段计提的折旧额大于后期阶段计提的折旧额。 可折旧值为<replaceable>原值</replaceable> - <replaceable>残值</replaceable>。使用期限为资产计提折旧的期间数，通常为年数。</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>第四年的折旧额为 $1014.29。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>支付期间</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>分期支付</term>
                                <listitem><para>1800</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>终值</term>
                                <listitem><para>120000</para></listitem>
                                </varlistentry>
                                <varlistentry>
                                <term>分期利率</term>
                                <listitem><para>0.11</para></listitem>
                                </varlistentry>
                             </variablelist> 
                             <para>Click <guibutton>Calculate</guibutton></para></entry>
                             <entry><para>20.32</para>
                                    <para>20.32 年后帐户中会累积到 $120,000。</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect2> 
    <!-- ================ Usage Subsection ================================ -->
    <sect2 id="gcalctool-scientific-mode"> 
      <title>执行科学运算</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>Calculator</application>&ldquo;科学模式&rdquo;按钮</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>设置精度</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>下表中的示例显示了精度设置对显示区域中的 <replaceable>x</replaceable> 的影响，当使用十进制并选中了<guimenuitem>&ldquo;末尾补零&rdquo;</guimenuitem>选项时，对于运算 <literal>1 / 8 = <replaceable>x</replaceable></literal>：</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>精度</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>1 个小数位</para></entry>
                             <entry><para>1.2</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>2 个小数位</para></entry>
                             <entry><para>1.25</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>3 个小数位</para></entry>
                             <entry><para>1.250</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </informaltable>
    </sect3>
    <sect3 id="gcalctool-display-type"> 
      <title>设置显示类型</title> 
      <para>要设置显示类型，请选择 <xref linkend="gcalctool-TBL-display-type"/> 中介绍的按钮之一。</para>
                <table id="gcalctool-TBL-display-type" frame="all">
                  <title>设置显示类型</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>&ldquo;工程&rdquo;显示类型</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>&ldquo;定点&rdquo;显示类型</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>&ldquo;科学&rdquo;显示类型</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>设置三角类型</title> 
      <para>要设置三角类型，请选择 <xref linkend="gcalctool-TBL-trig-type"/> 中介绍的按钮之一。</para>
                <table id="gcalctool-TBL-trig-type" frame="all">
                  <title>设置三角类型</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>角度</para> </entry>
                             <entry><para><guibutton>角度</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>弧度</para> </entry>
                             <entry><para><guibutton>弧度</guibutton></para></entry>
                             <entry><para>Sets the trigonometric type to radians.</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
    </sect3>
    <sect3 id="gcalctool-trig-options"> 
      <title>设置三角选项</title> 
      <para>要设置三角选项，请使用 <xref linkend="gcalctool-TBL-trig-options"/> 中介绍的选项。</para>
                <table id="gcalctool-TBL-trig-options" frame="all">
                  <title>设置三角选项</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>双曲线选项指示器</para> </entry>
                             <entry><para><guibutton>Hyp</guibutton></para></entry>
                             <entry><para>选择用于三角函数的双曲线选项。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>反转选项指示器</para> </entry>
                             <entry><para><guibutton>Inv</guibutton></para></entry>
                             <entry><para>选择用于三角函数的反转选项。</para></entry>
                           </row>
                         </tbody>
                  </tgroup>
                </table>
      <para>默认情况下，<xref linkend="gcalctool-TBL-trig-options"/> 中介绍的选项处于非选中状态。单击<guibutton>&ldquo;Clr&rdquo;</guibutton>可取消对这些选项的选择。</para>

    </sect3>
    <sect3 id="gcalctool-trig-calc"> 
      <title>计算三角值</title> 
      <para>要计算三角值，请使用 <xref linkend="gcalctool-TBL-trig-calc"/> 中介绍的选项。</para>
                <table id="gcalctool-TBL-trig-calc" frame="all">
                  <title>计算三角值</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>余弦 <literal>cos</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Cos&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于非选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于非选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的余弦。</para></entry>
                             <entry><para>60 <guibutton>Cos</guibutton></para></entry>
                             <entry><para>0.5</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>反余弦 <literal>acos</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Cos&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于非选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的反余弦。</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>双曲余弦 <literal>cosh</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Cos&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于非选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的双曲余弦。</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>反双曲余弦 <literal>acosh</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Cos&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的反双曲余弦。</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>正弦 <literal>sin</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Sin&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于非选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于非选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的正弦。</para></entry>
                             <entry><para>90 <guibutton>Sin</guibutton></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>反正弦 <literal>asin</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Sin&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于非选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的反正弦。</para></entry>
                             <entry><para>1 <guilabel>Inv</guilabel> <guibutton>Sin</guibutton></para></entry>
                             <entry><para>90</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>双曲正弦 <literal>sinh</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Sin&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于非选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的双曲正弦。</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>反双曲正弦 <literal>asinh</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Sin&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的反双曲正弦。</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>正切 <literal>tan</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Tan&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于非选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于非选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的正切。</para></entry>
                             <entry><para>45 <guibutton>Tan</guibutton></para></entry>
                             <entry><para>1</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>反正切 <literal>atan</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Tan&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于非选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的反正切。</para></entry>
                             <entry><para>1 <guilabel>Inv</guilabel> <guibutton>Tan</guibutton></para></entry>
                             <entry><para>45</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>双曲正切 <literal>tanh</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Tan&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于非选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的双曲正切。</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>反双曲正切 <literal>atanh</literal></para> </entry>
                             <entry><para><guibutton>&ldquo;Tan&rdquo;</guibutton>、<guilabel>&ldquo;Hyp&rdquo;</guilabel> 选项处于选中状态，<guilabel>&ldquo;Inv&rdquo;</guilabel>选项处于选中状态</para></entry>
                             <entry><para>计算显示区域中的当前值的反双曲正切。</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>计算对数</title> 
      <para>要计算对数，请使用 <xref linkend="gcalctool-TBL-logs-calc"/> 中介绍的按钮。</para>
                <table id="gcalctool-TBL-logs-calc" frame="all">
                  <title>计算对数</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>常用对数（以 10 为底）</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>自然对数</para> </entry>
                             <entry><para><guibutton>Ln</guibutton></para></entry>
                             <entry><para>计算显示区域中的当前值的自然对数。</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>此版本 <application>Calculator</application> 不支持常用对数和自然对数。</para>
                </note>
    </sect3>
    <sect3 id="gcalctool-enter-exp"> 
      <title>输入幂指数</title> 
      <para>要输入幂指数，请使用<guibutton>&ldquo;Exp&rdquo;</guibutton>按钮。</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>数字</para></entry>
                            <entry colname="COLSPEC1">
                                   <para>输入</para></entry>
                            <entry colname="COLSPEC2">
                                   <para>显示的数字</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>使用常数值</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>从菜单中选择一个常数，将其值输入显示区域中。如果使用键盘快捷键 <keycap>#</keycap>，则可以使用该键盘指定该常数，如下面的示例所示：</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>键盘项</para></entry>
              <entry colname="COLSPEC1">
                <para>常数</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><application>Calculator</application> 应用程序提供了十个默认常数值，如下表所述：</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>数字</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>值</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</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>将显示区域中的当前值与此常数相乘，将公里每小时转换成英里每小时。例如，8 * <guibutton>Con</guibutton><guilabel>C0</guilabel><keycap>=</keycap> 5。</para>
                                    <para>用显示区域中的当前值除以此常量，将英里每小时转换成公里每小时。例如 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>将显示区域中的当前值与此常数相乘，将厘米转换成英寸。例如，30 * <guibutton>Con</guibutton><guilabel>C4</guilabel><keycap>=</keycap> 12。</para>
                                    <para>用显示区域中的当前值除以此常量，将英寸转换成厘米。例如，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>将显示区域中的当前值与此常数相乘，将克转换成盎司。例如，500 * <guibutton>Con</guibutton><guilabel>C7</guilabel><keycap>=</keycap> 18。</para>
                                    <para>用显示区域中的当前值除以此常数，将盎司转换成克。例如，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>将显示区域中的当前值与此常数相乘，将千焦耳转换成英热单位。例如，10 * <guibutton>Con</guibutton><guilabel>C8</guilabel><keycap>=</keycap> 9.48。</para>
                                    <para>用显示区域中的当前值除以此常数，将英热单位转换成千焦耳。例如，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>将显示区域中的当前值与此常数相乘，将立方厘米转换成立方英寸。例如，100 * <guibutton>Con</guibutton><guilabel>C9</guilabel><keycap>=</keycap> 6.10。</para>
                                    <para>用显示区域中的当前值除以此常数，将立方英寸转换成立方厘米。例如，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>要存储新常数或编辑现存常数，请执行下列步骤：</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>使用函数</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>如果使用键盘快捷键 <keycap>F</keycap>，则可以使用该键盘指定该函数，如下面的示例所示：</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>键盘项</para></entry>
              <entry colname="COLSPEC1">
                <para>功能</para></entry>
            </row>
          </thead>
          <tbody>
            <row valign="top">
              <entry><para><keycap>F</keycap> <keycap>3</keycap> </para></entry>
              <entry><para>F3 键</para></entry>
            </row>
          </tbody>
        </tgroup>
      </informaltable>

      <para><application>Calculator</application> 应用程序没有提供任何默认函数。您最多可以存储十个函数。</para>
      <para>要存储新函数或编辑现存函数，请执行下列步骤：</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>执行杂项科学运算</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>执行杂项科学运算</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</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>计算以 <literal>e</literal> 为底，以显示区域中当前值为幂的幂指数的值。</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>计算以 10 为底、以显示区域中当前值为幂的幂指数的值。</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>计算以显示区域中的当前值为底、以输入的下一个值为幂的幂指数的值。</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> 的阶乘</para> </entry>
                             <entry><para><guibutton><replaceable>x</replaceable>!</guibutton></para></entry>
                             <entry><para>计算显示区域中的当前值的阶乘。<replaceable>x</replaceable> 的阶乘为 <replaceable>x</replaceable>*(<replaceable>x</replaceable>-1)*(<replaceable>x</replaceable>-2)...*1。此函数仅适用于正整数。</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>随机数据生成器</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>设置数值进制</title> 
      <para>要设置数值进制，请选择 <xref linkend="gcalctool-TBL-num-base"/> 中介绍的按钮之一。</para>
                <table id="gcalctool-TBL-num-base" frame="all">
                  <title>设置数值进制</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>二进制</para> </entry>
                             <entry><para><guibutton>Bin</guibutton></para></entry>
                             <entry><para>将数值进制设置为二进制，即以 2 为底数。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>八进制</para> </entry>
                             <entry><para><guibutton>Oct</guibutton></para></entry>
                             <entry><para>将数值进制设置为八进制，即以 8 为底数。</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>十进制</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>十六进制</para> </entry>
                             <entry><para><guibutton>Hex</guibutton></para></entry>
                             <entry><para>将数值进制设置为十六进制，即以 16 为底数。</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>Bitwise OR</para> </entry>
                             <entry><para><guibutton>OR</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>OR</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>AND</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>处理二进制数字</title> 
      <para>要处理二进制数字，请使用 <xref linkend="gcalctool-TBL-num-manip"/> 中介绍的按钮。</para>
                <table id="gcalctool-TBL-num-manip" frame="all">
                  <title>处理二进制数字</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>左移 <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 位</guilabel></para></entry>
                             <entry><para>1110</para></entry>
                           </row>
                           <row valign="top">
                             <entry><para>右移 <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 位</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>如果使用键盘快捷键，则可以使用键盘指定移动的位数，如下面的示例所示：</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>键盘项</para></entry>
              <entry colname="COLSPEC1">
                <para>说明</para></entry>
            </row>
          </thead>
          <tbody>
            <row valign="top">
              <entry><para><keycap>&lt;</keycap> <keycap>4</keycap></para></entry>
              <entry><para>将显示区域中当前的二进制值向左移动 4 位。</para></entry>
            </row>
            <row valign="top">
              <entry><para><keycap>&gt;</keycap> <keycap>4</keycap></para></entry>
              <entry><para>将显示区域中当前的二进制值向右移动 4 位。</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>功能</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>说明</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>示例</para></entry>
                                  <entry colname="COLSPEC4">
                                         <para>结果</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para>十六进制数字</para> </entry>
                             <entry><para><guibutton>A</guibutton> to <guibutton>F</guibutton> inclusive</para></entry>
                             <entry><para>这些数字仅在采用十六进制时可用。</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>退出</title> 
                <para>要退出 <application>Calculator</application>，请选择 <menuchoice><guimenu>&ldquo;计算器&rdquo;</guimenu><guimenuitem>&ldquo;退出&rdquo;</guimenuitem></menuchoice>。</para>
                <para>退出 <application>Calculator</application> 时将存储下列设置的当前值，在下次启动 <application>Calculator</application> 时会自动应用这些设置值：</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">精度</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">数值进制</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-display-type">显示类型</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-trig-type">三角类型</link></para></listitem>
                    <listitem><para><link linkend="gcalctool-set-acc">&ldquo;末尾补零&rdquo;</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>技术信息</title>

         <sect2 id="gcalctool-recognize-error">
                <title>错误情况</title>
                <para>如果执行了无效运算，<application>Calculator</application> 会以下列方式指示发生了错误： <itemizedlist>
<listitem><para>在显示区域中显示单词 <literal>Error</literal>。</para></listitem>
<listitem><para>Displays an error message in the status bar.</para></listitem>
<listitem><para>使所有计算器按钮不可用（<guibutton>&ldquo;Clr&rdquo;</guibutton>按钮除外）。</para></listitem>
<listitem><para>使所有计算器选项不可用。</para></listitem>
<listitem><para>使所有计算器菜单项不可用（以下按钮除外：<menuchoice><guimenu>&ldquo;计算器&rdquo;</guimenu><guimenuitem>&ldquo;退出&rdquo;</guimenuitem></menuchoice>和<menuchoice><guimenu>&ldquo;帮助&rdquo;</guimenu><guimenuitem>&ldquo;内容&rdquo;</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>快速参考：键盘快捷键</title> 
                <para><xref linkend="gcalctool-TBL-keyboard-shortcut-button"/>、<xref linkend="gcalctool-TBL-keyboard-shortcut-sci-options"/> 和 <xref linkend="gcalctool-TBL-keyboard-shortcut-menu"/> 提供了对所有 <application>Calculator</application> 键盘快捷键的快速参考。</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><application>Calculator</application> 按钮键盘快捷键快速参考</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>键盘快捷键</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>按钮</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>功能</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>请参见</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para><keycap>0</keycap> 至 <keycap>9</keycap></para></entry>
                             <entry><para><guibutton>&ldquo;0&rdquo;</guibutton>至<guibutton>&ldquo;9&rdquo;</guibutton></para></entry>
                             <entry><para>数字</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>精度</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>指数</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>功能</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>余弦</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>正弦</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>倒数</para> </entry>
                             <entry><para><xref linkend="gcalctool-TBL-adv-calc"/></para> </entry>
                           </row>
                           <row valign="top">
                             <entry><para><keycap>S</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>Rate</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>正切</guibutton></para></entry>
                             <entry><para>正切</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>Y</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>百分数</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>And</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> 和 <keycap>)</keycap></para></entry>
                             <entry><para><guibutton>&ldquo;(&rdquo;</guibutton>和<guibutton>&ldquo;)&rdquo;</guibutton></para></entry>
                             <entry><para>圆括号</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>乘</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>加</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>减</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>小数点</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>除</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> 或<keycap>回车</keycap>键</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>平方</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>Or</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>Backspace</keycap></para></entry>
                             <entry><para><guibutton>Bksp</guibutton></para></entry>
                             <entry><para>Backspace</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>Backspace</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>删除</keycap></keycombo></para></entry>
                             <entry><para><guibutton>Clr</guibutton></para></entry>
                             <entry><para>清除</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><application>Calculator</application>&ldquo;科学模式&rdquo;选项键盘快捷键快速参考</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>键盘快捷键</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>选项</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>功能</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>请参见</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>将数值进制设置为二进制。</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>将数值进制设置为十进制。</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>角度</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>选择用于三角函数的反转选项。</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>将数值进制设置为八进制。</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>弧度</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>Hex</guilabel></para></entry>
                             <entry><para>将数值进制设置为十六进制。</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>选择用于三角函数的双曲线选项。</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><application>Calculator</application> 菜单项键盘快捷键快速参考</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>键盘快捷键</para></entry>
                                  <entry colname="COLSPEC1">
                                         <para>菜单项</para></entry>
                                  <entry colname="COLSPEC2">
                                         <para>功能</para></entry>
                                  <entry colname="COLSPEC3">
                                         <para>请参见</para></entry>
                                </row>
                         </thead> 
                         <tbody> 
                           <row valign="top">
                             <entry><para><keycombo><keycap>Ctrl</keycap><keycap>b</keycap></keycombo></para></entry>
                             <entry><para> <menuchoice> <guimenu>&ldquo;视图&rdquo;</guimenu> <guimenuitem>&ldquo;基本&rdquo;</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>&ldquo;编辑&rdquo;</guimenu> <guimenuitem>&ldquo;复制&rdquo;</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>将显示区域中的当前值复制到剪贴板上</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>&ldquo;视图&rdquo;</guimenu> <guimenuitem>&ldquo;财务&rdquo;</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>&ldquo;帮助&rdquo;</guimenu> <guimenuitem>&ldquo;内容&rdquo;</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>显示 <application>Calculator</application> 联机帮助</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>&ldquo;编辑&rdquo;</guimenu> <guimenuitem>Insert ASCII Value</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>&ldquo;视图&rdquo;</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>&ldquo;视图&rdquo;</guimenu> <guimenuitem>&ldquo;存储寄存器&rdquo;</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>显示<guilabel>&ldquo;存储寄存器&rdquo;</guilabel>窗口</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>&ldquo;视图&rdquo;</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>Calculator</guimenu> <guimenuitem>&ldquo;退出&rdquo;</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>退出 <application>Calculator</application> 应用程序</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>&ldquo;视图&rdquo;</guimenu> <guimenuitem>&ldquo;科学&rdquo;</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>&ldquo;视图&rdquo;</guimenu> <guimenuitem>&ldquo;末尾补零&rdquo;</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>末尾补零</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>&ldquo;编辑&rdquo;</guimenu> <guimenuitem>&ldquo;粘贴&rdquo;</guimenuitem> </menuchoice> </para></entry>
                             <entry><para>将剪贴板中的当前值粘贴到显示区域中</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>&ldquo;编辑&rdquo;</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>&ldquo;编辑&rdquo;</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>
