slide0017.htm

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<title>第三章</title>
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 <div style='text-align:justify;mso-line-spacing:"115 0 0";position:absolute;
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 <div style='mso-line-spacing:"115 0 0"'><span style='position:absolute;
 top:10.75%;left:8.42%;width:102.62%;height:5.25%'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 </span></b><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>在程序中，某个常量多次被使用，则可以使用一个符</b></span></span><span
 style='position:absolute;top:17.25%;left:8.42%;width:104.68%;height:4.75%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>号来代替该常量，这样不仅在书写上方便，而且有效地改进</b></span></span><span
 style='position:absolute;top:23.0%;left:8.42%;width:88.2%;height:5.25%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>了程序的可读性和可维护性。</b></span><b>
 &#13;</b></span></div>
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 top:29.25%;left:8.42%;width:79.21%;height:6.0%'><nobr><span lang=EN-US
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 style='font-family:宋体;mso-fareast-font-family:宋体'><b>中使用关键字</b></span><span
 lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 mso-fareast-font-family:"Arial Unicode MS";font-size:117%;color:red;
 mso-fareast-language:ZH-CN'><b>Const </b></span><span style='font-family:宋体;
 mso-fareast-font-family:宋体'><b>声明符号常量。其格式如下：</b></span><span style='font-family:
 "Arial Unicode MS";mso-fareast-font-family:"Arial Unicode MS";display:none'><b>&#13;</b></span></nobr></div>
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 </b></span><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>常量名</b></span><span
 style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
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 lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>|</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>类型符号</b></span><span
 lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>]=</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>常数表达式</b></span><span
 style='font-family:"Arial Unicode MS";mso-fareast-font-family:"Arial Unicode MS";
 display:none'><b>&#13;</b></span></nobr></div>
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 top:42.75%;left:8.42%;width:10.29%;height:4.75%'><nobr><span style='font-family:
 宋体;mso-fareast-font-family:宋体'><b>例如：</b></span><span style='font-family:"Arial Unicode MS";
 mso-fareast-font-family:"Arial Unicode MS";display:none'><b>&#13;</b></span></nobr></div>
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 "Courier New";mso-ascii-font-family:"Courier New";mso-bidi-font-family:"Courier New"'><b><span
 style='mso-spacerun:yes'>&nbsp;</span>Const PI#=3.1415926535<span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp; </span></b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>等价于：</b></span><span
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 display:none'><b>&#13;</b></span></nobr></div>
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 </span>Const PI As Double=3.1415926535 </b></div>
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 top:71.25%;left:8.42%;width:102.24%;height:5.25%'><b><span
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 style='font-family:宋体;mso-fareast-font-family:宋体'><b>对象浏览器</b></span><b>”</b><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>中的</b></span><b> Visual
 Basic</b></span><span style='position:absolute;top:81.75%;left:8.42%;
 width:101.12%;height:5.25%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体'><b>（</b></span><span lang=EN-US style='mso-fareast-language:ZH-CN'><b>VB</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>）</b></span><b> </b><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>和</b></span><b> Visual
 Basic for applications</b><span style='font-family:宋体;mso-fareast-font-family:
 宋体'><b>（</b></span><span lang=EN-US style='mso-fareast-language:ZH-CN'><b>VBA</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>）对象库中</b></span></span><span
 style='position:absolute;top:87.25%;left:8.42%;width:87.26%;height:5.25%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>列举了</b></span><b> Visual
 Basic </b><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>的常数</b></span><b>
 </b></span></div>
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