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<title>if-else-end分枝语句</title>
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<p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-US
style='font-size:26.0pt;mso-bidi-font-size:12.0pt;color:blue'>if-else-end</span></b><b><span
style='font-size:26.0pt;mso-bidi-font-size:12.0pt;font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>分枝语句</span></b><b><span
lang=EN-US style='font-size:26.0pt;mso-bidi-font-size:12.0pt;color:blue'><o:p></o:p></span></b></p>
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style='mso-font-kerning:0pt'>
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<p><span style='font-size:10.5pt;mso-bidi-font-size:12.0pt'>最简单的<span
lang=EN-US>If-Else-End结构是：<o:p></o:p></span></span></p>
<p><span lang=EN-US style='font-size:10.5pt;mso-bidi-font-size:12.0pt'>if 条件式； <o:p></o:p></span></p>
<p><span style='font-size:10.5pt;mso-bidi-font-size:12.0pt'>运算式； <span
lang=EN-US><o:p></o:p></span></span></p>
<p><span lang=EN-US style='font-size:10.5pt;mso-bidi-font-size:12.0pt'>end<o:p></o:p></span></p>
<p><span style='font-size:10.5pt;mso-bidi-font-size:12.0pt;mso-bidi-font-weight:
bold'>如果在表达式中的所有元素为真<span lang=EN-US>(非零)，那么就执行if和end语言之间的语句。<o:p></o:p></span></span></p>
<p><span lang=EN-US style='font-size:10.5pt;mso-bidi-font-size:12.0pt;
color:blue;mso-bidi-font-weight:bold'>?if rand(1)>0.5<o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.5pt;mso-bidi-font-size:12.0pt;
color:blue;mso-bidi-font-weight:bold'>disp('i love you')<o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.5pt;mso-bidi-font-size:12.0pt;
color:blue;mso-bidi-font-weight:bold'>end<o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.5pt;mso-bidi-font-size:12.0pt;
color:blue;mso-bidi-font-weight:bold'>i love you</span><span lang=EN-US
style='font-size:10.5pt;mso-bidi-font-size:12.0pt;mso-bidi-font-weight:bold'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>如果有两个选择，</span><span lang=EN-US>If-Else-End</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>结构是：</span></p>
<p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:63.0pt'><span lang=EN-US>if<span
style="mso-spacerun: yes"> </span></span><span style='font-family:宋体'>条件式<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='text-indent:63.0pt'><span lang=EN-US><span
style="mso-spacerun: yes"> </span></span><span style='font-family:
宋体'>运算式</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes">
</span>else</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes">
</span></span><span style='font-family:宋体'>运算式</span></p>
<p class=MsoNormal style='text-indent:63.0pt'><span lang=EN-US>end</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>在这里，如果表达式为真，则执行第一组命令；如果表达式是假，则执行第二组命令</span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?if rand(1)>0.5<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>disp('i love you')<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>else<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>disp('i donot love you')<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>end<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>i donot love you</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>当有多种选择时，可以执行下面的语句：</span></p>
<p class=MsoNormal style='text-indent:52.5pt;mso-char-indent-count:5.0;
mso-char-indent-size:10.5pt'><span lang=EN-US>if </span><span style='font-family:
宋体'>条件式</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span></span><span
style='font-family:宋体'>运算式</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>elseif </span><span
style='font-family:宋体'>条件式</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span></span><span
style='font-family:宋体'>运算式</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>elseif </span><span
style='font-family:宋体'>条件式</span></p>
<p class=MsoNormal style='text-indent:63.0pt'><span style='font-family:宋体'>运算式<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='text-indent:63.0pt'><span lang=EN-US
style='font-family:宋体'>.<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:63.0pt'><span lang=EN-US
style='font-family:宋体'>.<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:63.0pt'><span lang=EN-US
style='font-family:宋体'>.<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
mso-bidi-font-weight:bold'>最后的这种形式，只和所碰到的、与第一个真值表达式相关的命令被执行；接下来的关系表达式不检验，跳过其余的</span><span
lang=EN-US style='mso-bidi-font-weight:bold'>If-Else-End</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";mso-bidi-font-weight:bold'>结构。而且，最后的</span><span lang=EN-US
style='mso-bidi-font-weight:bold'>else</span><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
mso-bidi-font-weight:bold'>命令可有可无。</span><span lang=EN-US style='mso-bidi-font-weight:
bold'><o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
mso-bidi-font-weight:bold'>应用：</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>知道了如何用</span><span
lang=EN-US>If-Else-End</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>结构来决策，就有可能提出一种合理的方法来跳出或中断</span><span
lang=EN-US>For</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>循环和</span><span lang=EN-US>While</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>循环</span><span lang=EN-US style='mso-font-kerning:0pt;
mso-bidi-font-weight:bold'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='mso-font-kerning:0pt'> <o:p></o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='mso-font-kerning:0pt'>
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