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📁 vb实例,很好很好用的哦,处学者的天堂这是第四部分
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<title>第四章：按钮</title>
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        <td width="100%"><font size="3" color="#8000FF"><strong><em>第四章：按钮（5）</em></strong></font></td>
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        <td width="100%" style="background-color: rgb(232,255,254)"><p ALIGN="JUSTIFY"><strong>下面会复杂一些，我们先跳过等号，而来处理四则运算：</strong></p>
        <p ALIGN="JUSTIFY"><strong>先在General里声明新变量：</strong></p>
        <p ALIGN="JUSTIFY"><strong><font color="#004080">Dim Runsign As Integer</font><font color="#008040"> '储存运算符号</font></strong></p>
        <p ALIGN="JUSTIFY"><strong><font color="#004080">Dim SignFlag As Boolean </font><font color="#008040">'判断是否已有运算符号</font></strong></p>
        <p ALIGN="JUSTIFY"><strong>然后在Form_Load中进行初赋值：</strong></p>
        <p ALIGN="JUSTIFY"><font color="#004080"><strong>Runsign = 0</strong></font></p>
        <p ALIGN="JUSTIFY"><font color="#004080"><strong>SignFlag = False</strong></font></p>
        <p ALIGN="JUSTIFY"><strong>在接下的Command1_Click中继续输入代码：</strong></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080"><strong>Case 12 To 15</strong></font></p>
          <blockquote>
            <p ALIGN="JUSTIFY"><strong><font color="#004080">FirstNum = True</font><font color="#008040">’使下一次可以输入新数据</font><br>
            <font color="#004080">PointFlag = False<br>
            </font><font color="#008040">'还原标记值</font></strong></p>
            <p ALIGN="JUSTIFY"><font color="#004080"><strong>If SignFlag Then’前面已有运算符未运算</strong></font></p>
            <blockquote>
              <p ALIGN="JUSTIFY"><font color="#004080"><strong>Call Run</strong></font></p>
            </blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080"><strong>Else</strong></font></p>
            <blockquote>
              <p ALIGN="JUSTIFY"><strong><font color="#004080">SignFlag = True<br>
              StrNum2 = StrNum1</font><font color="#008040">’把字符串1复制给字符串2</font><br>
              <font color="#004080">StrNum1 = &quot;&quot;</font><font color="#008040">’字符串1清空</font></strong></p>
            </blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080"><strong>End If</strong></font></p>
            <p ALIGN="JUSTIFY"><strong><font color="#004080">Runsign = Index - 11 </font><font color="#008040">‘储存键入的运算符</font></strong></p>
          </blockquote>
        </blockquote>
        <p ALIGN="JUSTIFY"><strong>里面运算的部分我用了一个过程，是因为在按下等号时还会调用到运算过程，这样可以减少代码的输入，也使程序便于浏览。建立过程（Procedure），可以在General部分直接输入，也可以通过菜单里的“Add 
        Procedure”添加。Run的代码如下：</strong></p>
        <p ALIGN="JUSTIFY"><font color="#004080"><strong>Sub Run()</strong></font></p>
        <blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080"><strong>Num1 = Val(StrNum2)<br>
          Num2 = Val(StrNum1)</strong></font></p>
          <p ALIGN="JUSTIFY"><font color="#004080"><strong>Select Case Runsign</strong></font></p>
          <blockquote>
            <blockquote>
              <p ALIGN="JUSTIFY"><strong><font color="#004080">Case 1</font><font color="#008040">’加</font></strong></p>
            </blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080"><strong>equal = Num1 + Num2</strong></font></p>
            <blockquote>
              <p ALIGN="JUSTIFY"><strong><font color="#004080">Case 2</font><font color="#008040">’减</font></strong></p>
            </blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080"><strong>equal = Num1 - Num2</strong></font></p>
            <blockquote>
              <p ALIGN="JUSTIFY"><strong><font color="#004080">Case 3</font><font color="#008040">’乘</font></strong></p>
            </blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080"><strong>equal = Num1 * Num2</strong></font></p>
            <blockquote>
              <p ALIGN="JUSTIFY"><strong><font color="#004080">Case 4</font><font color="#008040">’除</font></strong></p>
            </blockquote>
            <p ALIGN="JUSTIFY"><font color="#004080"><strong>equal = Num1 / Num2</strong></font></p>
          </blockquote>
          <p ALIGN="JUSTIFY"><font color="#004080"><strong>End Select</strong></font></p>
          <p ALIGN="JUSTIFY"><font color="#004080"><strong>StrNum2 = Str(equal)<br>
          StrNum1 = StrNum2<br>
          Text1.Text = StrNum2</strong></font></p>
        </blockquote>
        <p ALIGN="JUSTIFY"><font color="#004080"><strong>End Sub</strong></font></td>
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