📄 6_2.htm
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<title>while循环语句</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'>while</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'>循环语句</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>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='mso-font-kerning:0pt'>
<hr size=2 width="100%" align=center>
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<p class=MsoNormal><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"'>循环以不定的次数求一组语句的值。</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"'>循环的一般形式是：</span></p>
<p class=MsoNormal style='margin-left:63.0pt;text-indent:-63.0pt;mso-char-indent-count:
-6.0;mso-char-indent-size:10.5pt'><span lang=EN-US><span style='mso-tab-count:
1'> </span><span
style="mso-spacerun:
yes">
</span></span><span lang=EN-US style='font-size:10.0pt'>while </span><span
style='font-size:10.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>条件式；</span><span lang=EN-US
style='font-size:10.0pt'> <br>
</span><span style='font-size:10.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>运算式；</span><span lang=EN-US
style='font-size:10.0pt'> <br>
end</span><b style='mso-bidi-font-weight:normal'><span lang=EN-US><o:p></o:p></span></b></p>
<p class=MsoNormal><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'>只要在表达式里的所有元素为真，就执行</span><span
lang=EN-US style='mso-bidi-font-weight:bold'>while</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'>和</span><span lang=EN-US
style='mso-bidi-font-weight:bold'>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'>语句之间的</span><span style='mso-bidi-font-size:10.0pt;
font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>运算式</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'>。通常，表达式的求值给出一个标量值，但数组值也同样有效。在数组情况下，所得到数组的所有元素必须都为真</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span><span style='mso-bidi-font-size:10.0pt;font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:black'>就是说，只要条件示成立，运算式就会一再被执行。</span><span lang=EN-US style='mso-bidi-font-size:
10.0pt;color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>?x
= zeros(1,6); % x</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue;mso-font-kerning:0pt'>是一个的零矩阵</span><span
lang=EN-US style='color:blue;mso-font-kerning:0pt'> <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>i =
1; <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>while
i <= 6, <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>x(i)
= 1/i; <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>i =
i+1; <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>end
<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>?x<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue;mso-font-kerning:0pt'>x =<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US
style='color:blue;mso-font-kerning:0pt'>1.0000<span style="mso-spacerun:
yes"> </span>0.5000<span style="mso-spacerun:
yes"> </span>0.3333<span style="mso-spacerun:
yes"> </span>0.2500<span style="mso-spacerun:
yes"> </span>0.2000<span style="mso-spacerun:
yes"> </span>0.1667</span><span lang=EN-US style='mso-font-kerning:
0pt'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo1;
tab-stops:list 21.0pt'> <span lang=EN-US style='font-family:
Wingdings;mso-font-kerning:0pt'>l<span style='font:7.0pt "Times New Roman"'>
</span></span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>可以利用</span><span lang=EN-US
style='color:red'>break</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>命令跳出</span><span
lang=EN-US style='color:red'>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'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo1;
tab-stops:list 21.0pt'><span lang=EN-US style='font-family:
Wingdings;mso-font-kerning:0pt'>l<span style='font:7.0pt "Times New Roman"'>
</span></span> <span lang=EN-US style='color:red'>while</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>循环可按需要嵌套。</span><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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