slide0026.htm

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<title>第三章</title>
<meta name=Description content=2008-3-24>
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 <div class=O1 style='mso-margin-left-alt:540;mso-text-indent-alt:360'></div>
 <div class=O2 style='mso-margin-left-alt:804;mso-text-indent-alt:660'></div>
 <div class=O3 style='mso-margin-left-alt:1068;mso-text-indent-alt:924'></div>
 <div class=O4 style='mso-margin-left-alt:1332;mso-text-indent-alt:1188'></div>
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 style='font-family:"Arial Unicode MS";mso-ascii-font-family:宋体;mso-fareast-font-family:
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 <div class=O style='mso-line-spacing:"100 20 0";mso-margin-left-alt:60;
 position:absolute;top:11.25%;left:9.55%;width:94.75%;height:5.25%'><b><span
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 宋体;mso-fareast-font-family:宋体'><b>（</b></span><span lang=EN-US
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 style='font-family:宋体;mso-fareast-font-family:宋体'><b>）当两个操作式均为数值型，按数值大小比较。&#13;</b></span></div>
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 style='position:absolute;top:17.75%;left:9.55%;width:107.86%;height:5.25%'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp; </span></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>2</b></span><span style='font-family:
 宋体;mso-fareast-font-family:宋体'><b>）字符串比较</b></span><span lang=EN-US
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 宋体;mso-fareast-font-family:宋体'><b>则按字符的</b></span><span lang=EN-US
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 宋体;mso-fareast-font-family:宋体'><b>码值从左到右一一比较</b></span><span lang=EN-US
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 style='font-family:宋体;mso-fareast-font-family:宋体'><b>。&#13;</b></span></span></div>
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 <div style='text-align:justify;mso-line-spacing:"120 5 0";position:absolute;
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 宋体;mso-fareast-font-family:宋体'><b>（</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>3</b></span><span
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 top:50.74%;left:8.42%;width:75.09%;height:5.25%'><nobr><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 </span></b><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>如：</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>29&gt;&quot;189&quot;
 </b></span><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>，按数值比较，结果为</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>False</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>。</b></span><span
 style='font-family:"Arial Unicode MS";mso-fareast-font-family:"Arial Unicode MS";
 display:none'><b>&#13;</b></span></nobr></div>
 <div style='text-align:justify;mso-line-spacing:"120 5 0";position:absolute;
 top:57.49%;left:8.42%;width:72.28%;height:5.25%'><nobr><span style='font-family:
 宋体;mso-fareast-font-family:宋体'><b>（</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>4</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>）数值型与不能转换成数值型的字符型比较，&#13;</b></span></nobr></div>
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 top:64.0%;left:8.42%;width:69.1%;height:5.25%'><nobr><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>如：</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>77&gt;&quot;
 sdcd&quot; </b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体'><b>，不能比较，系统出错。</b></span><span style='font-family:"Arial Unicode MS";
 mso-fareast-font-family:"Arial Unicode MS";display:none'><b>&#13;</b></span></nobr></div>
 <div style='text-align:justify;mso-line-spacing:"120 5 0";position:absolute;
 top:70.75%;left:8.42%;width:57.3%;height:5.25%'><nobr><span style='font-family:
 宋体;mso-fareast-font-family:宋体'><b>（</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>5</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>）</b></span><b>“</b><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>Like</b></span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'><b>”</b></span><span
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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>VB6.0</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>新增加的。&#13;</b></span></nobr></div>
 <div style='text-align:justify;mso-line-spacing:"120 5 0";position:absolute;
 top:77.5%;left:8.42%;width:50.37%;height:5.25%'><nobr><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 </span></b><span style='font-family:宋体;mso-fareast-font-family:宋体'><b>其使用格式为：</b></span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'><b>str1 Like str2</b></span></nobr></div>
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