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style='mso-spacerun:yes'> </span>条件表达式2<span
style='mso-spacerun:yes'>
</span>条件表达式有一个T 结果为T</li>
</ul>
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<div id=PPTP24 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0028.htm');" id=PPTL24><span
style='mso-spacerun:yes'> </span></a></font></div>
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<td>
<div id=PPTP26 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0030.htm');" id=PPTL26>"3.4.6 运算符的执行顺"</a></font></div>
<div id=PPTC26 class=CTxt style='display:none'><font size=2>
<ul>
<li>3.4.6 运算符的执行顺序</li>
</ul>
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<div id=PPTP27 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0031.htm');" id=PPTL27><span
style='mso-spacerun:yes'> </span></a></font></div>
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<div id=PPTP28 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0033.htm');" id=PPTL28>"VB提供了上百种内部..."</a></font></div>
<div id=PPTC28 class=CTxt style='display:none'><font size=2>
<ul>
<li><span style='mso-spacerun:yes'> </span>VB提供了上百种内部函数（库函数），要求掌握这些常用函数的功能及使用。</li>
<li><span
style='mso-spacerun:yes'>
</span>调用方法：</li>
<li><span
style='mso-spacerun:yes'>
</span>函数名（参数列表）<span
style='mso-spacerun:yes'>
</span>有参函数</li>
<li><span
style='mso-spacerun:yes'>
</span>函数名<span
style='mso-spacerun:yes'>
</span>无参函数</li>
<li>说明：</li>
<li><span style='mso-spacerun:yes'> </span>（1） 使用库函数要注意参数的个数及其参数的数据类型</li>
<li><span style='mso-spacerun:yes'> </span>（2） 要注意函数的定义域（自变量或参数的取值范围）</li>
<li><span
style='mso-spacerun:yes'>
</span>例如：<span style='mso-spacerun:yes'> </span>sqr(x)<span
style='mso-spacerun:yes'>
</span>要求：<span style='mso-spacerun:yes'> </span>x>=0</li>
<li><span style='mso-spacerun:yes'> </span>（3）要注意函数的值域。</li>
<li><span style='mso-spacerun:yes'> </span>如：exp(23773)
的值就超出实数在计算机中的表示范围。</li>
</ul>
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<div id=PPTP29 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0034.htm');" id=PPTL29>"1"</a></font></div>
<div id=PPTC29 class=CTxt style='display:none'><font size=2>
<ul>
<li><span style='mso-spacerun:yes'> </span>1. 数学函数</li>
<li><span style='mso-spacerun:yes'>
</span>常用的数学函数见表3-8所示</li>
<li><span
style='mso-spacerun:yes'>
</span>Abs(N)<span
style='mso-spacerun:yes'>
</span>Cos(N)<span
style='mso-spacerun:yes'>
</span>Sin(N)<span
style='mso-spacerun:yes'>
</span>Exp(N)</li>
<li><span
style='mso-spacerun:yes'>
</span>Log(N)<span
style='mso-spacerun:yes'>
</span>Sqr(N)<span
style='mso-spacerun:yes'>
</span>Rnd[(N)]<span
style='mso-spacerun:yes'>
</span>Sgn(N)</li>
<li><span style='mso-spacerun:yes'> </span>说明：</li>
<li><span style='mso-spacerun:yes'> </span>(1) 在三角函数中的自变量是以弧度为单位。</li>
<li><span
style='mso-spacerun:yes'>
</span>如：sin30<sup>0<span
style='mso-spacerun:yes'>
</span></sup>sin(3.14159/180*30)</li>
<li><span style='mso-spacerun:yes'> </span>(2)<span
style='mso-spacerun:yes'> </span>Rnd函数返回0 ~ 1（包括0和不包括1）之间的双精度随机数。</li>
<li><span
style='mso-spacerun:yes'>
</span>若要产生1-100的随机整数：<span style='mso-spacerun:yes'>
</span>Int(Rnd *100)+1</li>
<li><span style='mso-spacerun:yes'>
</span>提问：怎样产生[N，M]区间的随机数？</li>
<li></li>
</ul>
</font></div>
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<div id=PPTP30 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0035.htm');" id=PPTL30>"2"</a></font></div>
<div id=PPTC30 class=CTxt style='display:none'><font size=2>
<ul>
<li><span style='mso-spacerun:yes'> </span>2. 转换函数</li>
<li><span style='mso-spacerun:yes'> </span>常用的转换函数见p62表所示</li>
<li><span style='mso-spacerun:yes'> </span>说明：</li>
<li><span style='mso-spacerun:yes'> </span>（1）要区别两个取整函数int()和fix()</li>
<li><span style='mso-spacerun:yes'>
</span>Fix(N)为截断取整，即去掉小数后的数。</li>
<li><span style='mso-spacerun:yes'>
</span>Int(N)不大于N的最大整数。</li>
<li><span
style='mso-spacerun:yes'>
</span>N>0与int(N) 相同，当N<0时， int(N) 与fix(N) -1相等。</li>
<li><span style='mso-spacerun:yes'> </span>例如：<span
style='mso-spacerun:yes'> </span>Fix(9.59)<span
style='mso-spacerun:yes'> </span>=9,<span
style='mso-spacerun:yes'>
</span>Int(9.59)<span style='mso-spacerun:yes'> </span>=9</li>
<li><span
style='mso-spacerun:yes'>
</span>Fix(-9.59)<span style='mso-spacerun:yes'>
</span>=-9,<span
style='mso-spacerun:yes'>
</span>Int(-9.59)<span style='mso-spacerun:yes'> </span>=-10</li>
<li><span
style='mso-spacerun:yes'>
</span>思考：如何实现四舍五入取整？</li>
<li><span style='mso-spacerun:yes'> </span>（2）Asc("Abcd")<span
style='mso-spacerun:yes'> </span>值为：
65<span style='mso-spacerun:yes'> </span>（只取首字母的Ascii值）</li>
<li><span style='mso-spacerun:yes'> </span>（3）Val("abc123")<span
style='mso-spacerun:yes'> </span>值为：0,<span
style='mso-spacerun:yes'> </span>Val("1.2sa10")<span
style='mso-spacerun:yes'> </span>值为1.2</li>
<li><span
style='mso-spacerun:yes'>
</span>注意： Val( )函数只将最前面的数字字符转换为数值。</li>
</ul>
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<div id=PPTP31 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0036.htm');" id=PPTL31>"3"</a></font></div>
<div id=PPTC31 class=CTxt style='display:none'><font size=2>
<ul>
<li>3. 字符串操作函数</li>
<li><span style='mso-spacerun:yes'>
</span>常用的字符串函数见p64表</li>
<li>说明：</li>
<li><span
style='mso-spacerun:yes'>
</span>如果返回是字符型，则函数后有“$”字符。当然一般也可以不写，习惯都写上。</li>
<li>例如：</li>
<li><span style='mso-spacerun:yes'> </span>len("This is a
book!")<span
style='mso-spacerun:yes'>
</span>15</li>
<li><span style='mso-spacerun:yes'>
</span>Left$("ABCDEFG",3)<span
style='mso-spacerun:yes'>
</span>"ABC"</li>
<li><span style='mso-spacerun:yes'>
</span>Mid$("ABCDEFG",2,3)<span
style='mso-spacerun:yes'>
</span>"BCD"</li>
<li><span style='mso-spacerun:yes'> </span>InStr(2, “ABCDEFGEF”,
“EF”) <span
style='mso-spacerun:yes'>
</span>5（第一次出现的位置）</li>
</ul>
</font></div>
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<div id=PPTP32 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0039.htm');" id=PPTL32><span
style='mso-spacerun:yes'> </span></a></font></div>
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<td>
<div id=PPTP33 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0037.htm');" id=PPTL33>"（1）数值型数据格..."</a></font></div>
<div id=PPTC33 class=CTxt style='display:none'><font size=2>
<ul>
<li>（1）数值型数据格式化(见表3-12)</li>
<li><span
style='mso-spacerun:yes'>
</span>注意：对于符号：0与#，当数值的实际位数比格式控制给定的位数多时，系统将按四舍五入返回给定的位数。</li>
<li><span
style='mso-spacerun:yes'>
</span>如：Format(3.14159, “###.###”),<span
style='mso-spacerun:yes'> </span>其值为 3.142</li>
<br>
<br>
<li>（2）日期和时间型数据格式化(见表3-13)</li>
<li><span style='mso-spacerun:yes'> </span>缺省日期格式为：“mm/dd/yy”,<span
style='mso-spacerun:yes'> </span>时间格式：“hh:mm:ss”</li>
<br>
<br>
<li><span style='mso-spacerun:yes'> </span>（3）字符串类型数据格式化(见表3-14)</li>
</ul>
</font></div>
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<div id=PPTP34 class=PTxt><font size=2><a
href="javascript:GoToSld('slide0038.htm');" id=PPTL34>"3.5.6 其它函"</a></font></div>
<div id=PPTC34 class=CTxt style='display:none'><font size=2>
<ul>
<li>3.5.6 其它函数</li>
<li><span
style='mso-spacerun:yes'>
</span>除上面常用的四类函数，VB中还有测试函数（见表3-15）、与文件操作有关的函数（见表3-16）及其它函数（见表3-17）</li>
</ul>
</font></div>
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