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<span style="background-color: #CCFF99">第 1 章</span><span style="background-color: #CCFF99">
</span>><span style="background-color: #CCFF99"> 第 1 节 </span>><span style="background-color: #CCFF99">
1.1 C++语言概述</span></p>
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<p align="left" class="右内容" style="text-indent: 0; line-height: 150%; margin: 0"><font size="2">C++<font FACE="??ì?,SimSun" LANG="ZH-CN">程序由编译预处理、程序主体和注释组成。下面是一个简单的</font>C++<font FACE="??ì?,SimSun" LANG="ZH-CN">程序。</font></font></p>
<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">【例</font>1-1<font FACE="??ì?,SimSun" LANG="ZH-CN">】一个简单的</font>C++<font FACE="??ì?,SimSun" LANG="ZH-CN">程序。</font></font></p>
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<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">#include <iostream.h></font></p>
<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">void main( )</font></p>
<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">{</font></p>
<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">for (int i= 0 ; i < 3
; i++) { //<font FACE="??ì?,SimSun" LANG="ZH-CN">循环语句</font></font></p>
<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">cout <<
"Hello! My friend!\n"; //<font FACE="??ì?,SimSun" LANG="ZH-CN">向屏幕输出</font>Hello!
My friend!</font></p>
<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">}</font></p>
<p ALIGN="JUSTIFY" class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">}</font></p>
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<p class="右内容" style="line-height: 150%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">程序运行的结果是在屏幕上显示三行提示信息“</font>Hello!
My friend<font FACE="??ì?,SimSun" LANG="ZH-CN">！”。</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2">C++<font FACE="??ì?,SimSun" LANG="ZH-CN">语言的基本数据类型有如下四种：</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">①
整型，说明符为</font>int<font FACE="??ì?,SimSun" LANG="ZH-CN">。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">②
字符型，说明符为</font>char<font FACE="??ì?,SimSun" LANG="ZH-CN">。</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">③
浮点型（又称实型），说明符为</font>float<font FACE="??ì?,SimSun" LANG="ZH-CN">（单精度），</font>double<font FACE="??ì?,SimSun" LANG="ZH-CN">（双精度）。</font></font></p>
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<p style="line-height: 150%; margin-top: 0; margin-bottom: 0"></font><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN">④
空值型，说明符为</font>void<font FACE="??ì?,SimSun" LANG="ZH-CN">，用于函数和指针。</font></font></p>
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