slide0028.htm

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<title>第三章</title>
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 width:86.51%;height:5.5%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:117%;color:#FF3300'><b>说明：</b></span><span style='font-family:
 宋体;mso-fareast-font-family:宋体;display:none'><b>&#13;</b></span></div>
 <div style='text-align:justify;mso-line-spacing:"120 0 0";position:absolute;
 top:12.75%;left:10.11%;width:86.51%;height:11.5%'><span style='font-family:
 宋体;mso-fareast-font-family:宋体;color:black'><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";color:black;mso-fareast-language:
 ZH-CN'><b>1</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><b>）逻辑运算符的优先级不相同，</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:black;mso-fareast-language:ZH-CN'><b>Not</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>（逻辑非）最高，但它低于关系运算，</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:black;mso-fareast-language:
 ZH-CN'><b>Imp</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><b>（逻辑蕴含）最低。&#13;</b></span></div>
 <div style='text-align:justify;mso-line-spacing:"120 0 0";position:absolute;
 top:25.5%;left:10.11%;width:86.51%;height:11.5%'><span style='font-family:
 宋体;mso-fareast-font-family:宋体;color:black'><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";color:black;mso-fareast-language:
 ZH-CN'><b>2</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><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";
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 style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>中常用的逻辑运算符是</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:black;mso-fareast-language:
 ZH-CN'><b>Not</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><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";
 color:black;mso-fareast-language:ZH-CN'><b>And</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>和</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:black;mso-fareast-language:
 ZH-CN'><b>Or</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><b>。它们用于将多个关系表达式进行逻辑判断。</b></span><span style='font-family:
 "Arial Unicode MS";mso-fareast-font-family:"Arial Unicode MS";color:black;
 display:none'><b>&#13;</b></span></div>
 <div style='text-align:justify;mso-line-spacing:"120 0 0";position:absolute;
 top:38.25%;left:10.11%;width:86.51%;height:11.5%'><span style='font-family:
 宋体;mso-fareast-font-family:宋体;color:black'><b>例如，数学上表示某个数在某个区域时用表达式：</b></span><span
 style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 mso-fareast-font-family:"Arial Unicode MS";color:black'><b><span
 style='mso-spacerun:yes'>&nbsp; </span>10</b></span><span lang=EN-US
 style='font-family:宋体;mso-fareast-font-family:宋体;color:black;mso-fareast-language:
 ZH-CN'><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";
 color:black;mso-fareast-language:ZH-CN'><b>X&lt;20</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>，用</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:black;mso-fareast-language:
 ZH-CN'><b>VB</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><b>程序中应写成：</b></span><span style='font-family:"Arial Unicode MS";
 mso-fareast-font-family:"Arial Unicode MS";color:black;display:none'><b>&#13;</b></span></div>
 <div style='text-align:justify;mso-line-spacing:"120 0 0";position:absolute;
 top:51.0%;left:10.11%;width:32.58%;height:5.25%'><nobr><span style='font-family:
 "Times New Roman";mso-ascii-font-family:"Times New Roman";mso-fareast-font-family:
 "Arial Unicode MS";color:black'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 </span>X&gt;=10 And X&lt;20 &#13;</b></span></nobr></div>
 <div style='text-align:justify;mso-line-spacing:"120 0 0";position:absolute;
 top:57.49%;left:10.11%;width:86.51%;height:18.0%'><span style='font-family:
 宋体;mso-fareast-font-family:宋体;color:black'><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";color:black;mso-fareast-language:
 ZH-CN'><b>3</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><b>）参与逻辑运算的量一般都应是逻辑型数据，如果参与逻辑运算的两操作数是数值量，则以数值的二进制值逐位进行逻辑运算（</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:black;mso-fareast-language:
 ZH-CN'><b>0</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><b>当</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:black;mso-fareast-language:ZH-CN'><b>False,1</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>当</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:black;mso-fareast-language:
 ZH-CN'><b>True</b></span><span style='font-family:宋体;mso-fareast-font-family:
 宋体;color:black'><b>）。</b></span><span style='font-family:"Arial Unicode MS";
 mso-fareast-font-family:"Arial Unicode MS";color:black;display:none'><b>&#13;</b></span></div>
 <div style='text-align:justify;mso-line-spacing:"120 0 0";position:absolute;
 top:76.5%;left:10.11%;width:86.51%;height:11.5%'><span style='color:black'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>关系表达式与逻辑表达式常常用在条件语句与循环语句中，作为条件控制程序的流程走向。</b></span><span
 style='color:black'><b> </b></span></div>
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