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<span style="background-color: #CCFF99">第 2 章</span><span style="background-color: #CCFF99">
</span>><span style="background-color: #CCFF99"> 第 1 节 </span>><span style="background-color: #CCFF99">
2.1 基本结构与控制语句(2)</span></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">4.
while</font><font FACE="??ì?,SimSun" LANG="ZH-CN"><font size="2">语句
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">while<font FACE="??ì?,SimSun" LANG="ZH-CN">语句是一个循环控制语句，用来控制程序段的重复执行。</font>while<font FACE="??ì?,SimSun" LANG="ZH-CN">语句的语法格式为：</font></font></p>
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<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">while(<font FACE="??ì?,SimSun" LANG="ZH-CN">条件表达式</font>)</font></p>
<p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000"><font FACE="??ì?,SimSun" LANG="ZH-CN">循环体</font>;</font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">while<font FACE="??ì?,SimSun" LANG="ZH-CN">语句的四个要素：</font></font></p>
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<p style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" size="2">循环变量初始化、继续条件、循环体、改变循环变量的表达式。</font></p>
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<p style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN"><span style="font-size:10.0pt;font-family:宋体;
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EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA"><a href="example2-6.htm" target="_blank">【例2-6】</a></span>求</font>1+3+5+<font FACE="??ì?,SimSun" LANG="ZH-CN">…</font>+99<font FACE="??ì?,SimSun" LANG="ZH-CN">的值。</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">5.
do~while</font><font FACE="??ì?,SimSun" LANG="ZH-CN"><font size="2">语句
<span style="position: absolute; left: 533; top: 269"><img border="0" src="right22.gif" width="126" height="127"></span></font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">do~while<font FACE="??ì?,SimSun" LANG="ZH-CN">语句也是一个循环控制语句。</font>do~while<font FACE="??ì?,SimSun" LANG="ZH-CN">语句的语法格式为：</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">do</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000"><font FACE="??ì?,SimSun" LANG="ZH-CN">循环体</font>;</font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">while(<font FACE="??ì?,SimSun" LANG="ZH-CN">条件表达式</font>);</font></p>
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<p style="line-height: 100%; margin-top: 0; margin-bottom: 0"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" size="2">说明：循环体至少执行一次。当循环体有多个语句时必须加花括号。</font></p>
<p style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2"><font FACE="??ì?,SimSun" LANG="ZH-CN"><a href="example2-7.htm" target="_blank">【例</a></font><a href="example2-7.htm" target="_blank">2-7<font FACE="??ì?,SimSun" LANG="ZH-CN">】</font></a><font FACE="??ì?,SimSun" LANG="ZH-CN">求</font>1+3+5+<font FACE="??ì?,SimSun" LANG="ZH-CN">…</font>+99<font FACE="??ì?,SimSun" LANG="ZH-CN">的值。</font></font></p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"> </p>
<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">6.
for</font><font FACE="??ì?,SimSun" LANG="ZH-CN"><font size="2">语句
<span style="position: absolute; left: 529; top: 481"><img border="0" src="right25.gif" width="146" height="185"></span></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">for<font FACE="??ì?,SimSun" LANG="ZH-CN">语句的语法格式为：</font></font></p>
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<p ALIGN="JUSTIFY" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2" color="#008000">for(<font FACE="??ì?,SimSun" LANG="ZH-CN">表达式</font>1;
<font FACE="??ì?,SimSun" LANG="ZH-CN">表达式</font>2; <font FACE="??ì?,SimSun" LANG="ZH-CN">表达式</font>3)</font></p>
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