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<body lang=ZH-CN link=blue vlink=blue style='tab-interval:21.0pt'>

<div class=Section1>

<p align=center style='text-align:center;layout-grid-mode:char'><b><span
style='font-size:16.0pt;letter-spacing:1.0pt'>第四章<span lang=EN-US> VB程序的控制结构</span></span></b><span
lang=EN-US><o:p></o:p></span></p>

<p align=center style='text-align:center;layout-grid-mode:char'><b><span
lang=EN-US style='font-size:14.0pt;letter-spacing:1.0pt'>4.1</span></b><b><span
lang=EN-US style='font-size:7.0pt;font-family:"Times New Roman";letter-spacing:
1.0pt'>&nbsp; </span></b><b><span style='font-size:14.0pt;letter-spacing:1.0pt'>算法概论</span></b><span
lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><b><span lang=EN-US style='letter-spacing:
1.0pt'>1．算法的概念</span></b><span lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><b><span style='letter-spacing:1.0pt'>　　算法</span></b><span
style='letter-spacing:1.0pt'>：指用计算机解决某一问题的方法和步骤。</span><span lang=EN-US><o:p></o:p></span></p>

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 1.5pt' height=91>
 <tr style='height:36.0pt'>
  <td width="12%" rowspan=2 style='width:12.0%;padding:.75pt .75pt .75pt .75pt;
  height:36.0pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;color:#333399;letter-spacing:
  1.0pt'>算法分类</span></b><span style='font-size:10.0pt;color:#333399;letter-spacing:
  1.0pt'>：</span><span style='font-size:10.0pt;color:#333399'> <span
  lang=EN-US><o:p></o:p></span></span></p>
  </td>
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  height:36.0pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;color:#333399;letter-spacing:
  1.0pt'>数值算法</span></b><span style='font-size:10.0pt;color:#333399;letter-spacing:
  1.0pt'>：用于解决一般数学解析方法难以解决的问题，如：求超越方程的根、求定积分、解微分方程等。</span><span lang=EN-US
  style='font-size:10.0pt;color:#333399'><o:p></o:p></span></p>
  </td>
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 <tr>
  <td style='padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;color:#333399;letter-spacing:
  1.0pt'>非数值算法</span></b><span style='font-size:10.0pt;color:#333399;
  letter-spacing:1.0pt'>：用于对非数值信息进行查找、排序等。</span><span lang=EN-US
  style='font-size:10.0pt;color:#333399'><o:p></o:p></span></p>
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 </tr>
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<p style='layout-grid-mode:char'><b><span style='letter-spacing:1.0pt'>　　数值算法</span></b><span
style='letter-spacing:1.0pt'>：用于解决一般数学解析方法难以解决的问题，如：求超越方程的根、求定积分、解微分方程等。</span><span
lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><span lang=EN-US style='letter-spacing:1.0pt'>&nbsp;&nbsp;&nbsp;&nbsp;
<b>非数值算法</b>：用于对非数值信息进行查找、排序等。</span><span lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><b><span lang=EN-US style='letter-spacing:
1.0pt'>2．算法的特征</span></b><span lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><span style='letter-spacing:1.0pt'>　（<span
lang=EN-US>1）<b>确定性</b>：指算法的每个步骤都应确切无误，没有歧义。<br>
　（2）<b>可行性</b>：指算法的每个步骤必须是计算机能够有效执行、可以实现的，并可得到确定的结果。</span></span><span
lang=EN-US><br>
　<span style='letter-spacing:1.0pt'>（3）<b>有穷性</b>：指一个算法应该在有限的时间和步骤内可以执行完毕的。</span><br>
　<span style='letter-spacing:1.0pt'>（4）<b>输入性</b>：指一个算法可以有0或多个输入数据。</span><br>
　<span style='letter-spacing:1.0pt'>（5）<b>输出性</b>：指一个算法必须有一个或多个输出结果。</span><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><b><span lang=EN-US style='letter-spacing:
1.0pt'>3．算法的评价</span></b><span lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><span style='letter-spacing:1.0pt'>　　主要评价指标是：<b>算法是否正确、运行的效率、占用系统资源的多少</b>。</span><span
lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><b><span lang=EN-US style='letter-spacing:
1.0pt'>4．算法的描述</span></b><span lang=EN-US><o:p></o:p></span></p>

<p style='layout-grid-mode:char'><span style='letter-spacing:1.0pt'>　　一般常用流程框图来描述算法。</span><span
lang=EN-US><o:p></o:p></span></p>

<table border=1 cellpadding=0 width="47%" style='width:47.0%;mso-cellspacing:
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  <td style='padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;color:#333399;letter-spacing:
  1.0pt'>名称</span></b><span lang=EN-US style='font-size:10.0pt;color:#333399'><o:p></o:p></span></p>
  </td>
  <td style='padding:.75pt .75pt .75pt .75pt'>
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 <tr>
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