slide0021.htm

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<title>第三章</title>
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 height:11.0%'><span style='mso-special-format:nobullet;display:none'>&#8226;</span><span
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 Sub Form_Click()&#13;</b></span></nobr></div>
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 0;mso-text-indent-alt:300;position:absolute;top:22.75%;left:14.04%;width:14.23%;
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 = 0&#13;</b></span></nobr></div>
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 0;mso-text-indent-alt:300;position:absolute;top:28.49%;left:14.04%;width:28.08%;
 height:5.5%'><nobr><span style='mso-special-format:nobullet;display:none'>&#8226;</span><span
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 = 10: b = 20&#13;</b></span></nobr></div>
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 0;mso-text-indent-alt:300;position:absolute;top:34.25%;left:14.04%;width:22.09%;
 height:5.5%'><nobr><span style='mso-special-format:nobullet;display:none'>&#8226;</span><span
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 = a + b&#13;</b></span></nobr></div>
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 0;mso-text-indent-alt:300;position:absolute;top:40.25%;left:14.04%;width:34.08%;
 height:5.5%'><nobr><span style='mso-special-format:nobullet;display:none'>&#8226;</span><span
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 mso-bidi-font-family:"Courier New";font-size:75%;mso-fareast-language:ZH-CN'><b>Print
 &quot;Sum=&quot;; Sum&#13;</b></span></nobr></div>
 <div class=B style='text-align:justify;mso-line-spacing:"110 0 0";mso-margin-left-alt:
 0;mso-text-indent-alt:300;position:absolute;top:46.0%;left:14.04%;width:14.23%;
 height:5.5%'><nobr><span style='mso-special-format:nobullet;display:none'>&#8226;</span><span
 lang=EN-US style='font-family:"Courier New";mso-ascii-font-family:"Courier New";
 mso-bidi-font-family:"Courier New";font-size:75%;mso-fareast-language:ZH-CN'><b>End
 Sub</b></span></nobr></div>
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 lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
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 lang=EN-US style='mso-fareast-language:ZH-CN'><b>——</b></span><span
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 Explicit</b></span><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>语句</b></span></nobr></div>
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 style='font-family:宋体;mso-fareast-font-family:宋体'><b>先声明变量,后使用变量</b></span><b>”</b><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>,这样做可以提高程序的效率,同时也使程序易于调试。</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>Visual
 Basic </b></span><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>中可以强制显式声明,可以在窗体模块、标准模块和类模块的通用声明段中加入语句:</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";color:red;mso-fareast-language:
 ZH-CN'><b>Option Explicit</b></span><span lang=EN-US style='font-family:宋体;
 mso-fareast-font-family:宋体;color:red;mso-fareast-language:ZH-CN;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
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