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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      首頁 > 編程開發 > VBnet >
      • vb.net教程之運算符與表達式

      • 2015-01-24 14:26 來源:未知
      注意:運算符與表達式(相關vb.net教程)
      表達式:由運算符、運算量構成的式子。如:2*3.14*r
      運算符:連接符號,共有:
      算術運算符:+ - * /  \  mod
      字符串運算符:+  &
      關系運算符:> 、>=、 <、 <=、 =、<>
      邏輯運算符:not  and  or 
      運算量:常數(量)、變量、函數(或屬性值)。
      常量:Const pi = 3.14
      變量:  Dim r As Integer
              Dim p, s As Single
      實例:任意輸入圓的半徑r,求圓的周長P與面積s。[實驗報告3]
      程序見,輸入圓的半徑r求周長面積,程序為:
      Public Class Form1
          Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
              Dim r As Integer
              Dim p, s As Single
              r = Val(TextBox1.Text)
              p = 2 * 3.14 * r
              s = 3.14 * r * r
              TextBox2.Text = p
              TextBox3.Text = s
          End Sub
       
          Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
              End
          End Sub
      End Class
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