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<title>第三章</title>
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<div class=B2 style='mso-margin-left-alt:732;mso-text-indent-alt:588'></div>
<div class=B style='mso-line-spacing:"100 50 0";mso-margin-left-alt:0;
position:absolute;top:16.5%;left:8.42%;width:90.63%;height:6.0%'><span
style='mso-special-format:nobullet;display:none'>•</span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:88%;color:#FF3300'><b>一</b></span><span
lang=EN-US style='font-size:88%;color:#FF3300;mso-fareast-language:ZH-CN'><b>.</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:88%;color:#FF3300'><b>变量和常量的命名规则</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:88%;display:none'><b> </b></span></div>
<div class=B1 style='mso-line-spacing:"100 50 0";mso-margin-left-alt:120;
mso-text-indent-alt:120'><span style='position:absolute;top:25.5%;left:10.67%;
width:105.61%;height:5.25%'><span style='mso-special-format:nobullet;
display:none;color:#D69B80;mso-color-index:5;font-family:Wingdings'>l</span><span
style='font-size:86%'><b><span
style='mso-spacerun:yes'> </span>1. </b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%;color:blue'><b>以字母或汉字开头</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>，后可跟字母、数字或下划线组成，</b></span></span><span
style='position:absolute;top:30.75%;left:10.67%;width:88.57%;height:5.25%'><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>长度小于等于</b></span><span
lang=EN-US style='font-size:86%;mso-fareast-language:ZH-CN'><b>40</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>个字符； </b></span></span></div>
<div class=B1 style='mso-line-spacing:"100 50 0";mso-margin-left-alt:120;
mso-text-indent-alt:120;position:absolute;top:38.75%;left:10.67%;width:88.57%;
height:5.25%'><span style='mso-special-format:nobullet;display:none;
color:#D69B80;mso-color-index:5;font-family:Wingdings'>l</span><span
style='font-size:86%'><b><span
style='mso-spacerun:yes'> </span>2. </b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>不能使用</b></span><span
lang=EN-US style='font-size:86%;mso-fareast-language:ZH-CN'><b>VB</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>中的关键字； </b></span></div>
<div class=B1 style='mso-line-spacing:"100 50 0";mso-margin-left-alt:120;
mso-text-indent-alt:120;position:absolute;top:46.75%;left:10.67%;width:88.57%;
height:5.25%'><span style='mso-special-format:nobullet;display:none;
color:#D69B80;mso-color-index:5;font-family:Wingdings'>l</span><span
style='font-size:86%'><b><span
style='mso-spacerun:yes'> </span>3. VB</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>中</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%;color:red'><b>不区分</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>变量名的大小写</b></span><span
lang=EN-US style='font-size:86%;mso-fareast-language:ZH-CN'><b>. </b></span></div>
<div class=B1 style='mso-line-spacing:"100 50 0";mso-margin-left-alt:120;
mso-text-indent-alt:120'><span style='position:absolute;top:54.75%;left:10.67%;
width:105.61%;height:5.25%'><span style='mso-special-format:nobullet;
display:none;color:#D69B80;mso-color-index:5;font-family:Wingdings'>l</span><span
lang=EN-US style='font-size:86%;mso-fareast-language:ZH-CN'><b><span
style='mso-spacerun:yes'> </span>4. </b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>为了增加程序的可读性，可在变量名前加一个缩写的前</b></span></span><span
style='position:absolute;top:60.5%;left:10.67%;width:88.57%;height:4.75%'><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>缀来表明该变量的数据类型。 </b></span></span></div>
<div class=B1 style='mso-line-spacing:"100 50 0";mso-margin-left-alt:120;
mso-text-indent-alt:120'><span style='position:absolute;top:68.0%;left:10.67%;
width:98.87%;height:5.25%'><span style='mso-special-format:nobullet;
display:none;color:#D69B80;mso-color-index:5;font-family:Wingdings'>l</span><span
style='font-size:86%'><b><span
style='mso-spacerun:yes'>
</span></b></span><span style='font-family:宋体;mso-fareast-font-family:宋体;
font-size:86%'><b>例如：</b></span><span lang=EN-US style='font-size:86%;
mso-fareast-language:ZH-CN'><b>strAbc, </b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体;font-size:86%'><b>（</b></span><span lang=ZH-CN
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%;mso-fareast-language:
ZH-CN'><b>字符串变量）</b></span><span style='font-size:86%'><b><span
style='mso-spacerun:yes'> </span>iCount,<span
style='mso-spacerun:yes'> </span></b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体;font-size:86%'><b>（整型变</b></span></span><span
style='position:absolute;top:73.25%;left:10.67%;width:88.57%;height:5.25%'><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>量）</b></span><span
style='font-size:86%'><b><span style='mso-spacerun:yes'>
</span> </b></span></span></div>
<div class=B1 style='mso-line-spacing:"100 50 0";mso-margin-left-alt:120;
mso-text-indent-alt:120;position:absolute;top:81.25%;left:10.67%;width:106.36%;
height:5.25%'><span style='mso-special-format:nobullet;display:none;
color:#D69B80;mso-color-index:5;font-family:Wingdings'>l</span><span
style='font-size:86%'><b><span
style='mso-spacerun:yes'>
</span>dblx,<span style='mso-spacerun:yes'> </span></b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>（双精度变量）</b></span><span
style='font-size:86%'><b><span style='mso-spacerun:yes'>
</span>sYz<span style='mso-spacerun:yes'> </span></b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:86%'><b>（单精度变量）</b></span></div>
</div>
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position:absolute;top:5.5%;left:9.36%;width:48.12%;height:6.75%'><span
lang=EN-US style='font-size:133%;mso-fareast-language:ZH-CN'><b>3.3.2<span
style='mso-spacerun:yes'> </span></b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体;font-size:133%'><b>变</b></span><span
style='font-size:133%'><b> </b></span><span style='font-family:宋体;mso-fareast-font-family:
宋体;font-size:133%'><b>量</b></span><span style='font-size:133%'><b> </b></span></div>
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