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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教程之綜合實例

      • 2015-01-24 13:14 來源:未知
      綜合實例(相關vb.net教程)
      用定義類的方法編程序,對任輸入的矩形的兩邊,求其周長與面積,并對輸入的兩邊進行正確性檢查。見,矩形的兩邊求面積與周長類,程序為:[實驗報告7]  或類的應用矩形問題
      Public Class juxing
          Public w, h As Integer
          Public Sub New()
              w = 0 : h = 0
          End Sub
          Public Sub New(ByVal a As Integer, ByVal b As Integer)
              If a >= 0 Then
                  w = a
              Else
                  MsgBox("無效的矩形長度,即將退出!", MsgBoxStyle.OkOnly, "提示")
                  End
              End If
              If b >= 0 Then
                  h = b
              Else
                  MsgBox("無效的矩形高度,即將退出!", MsgBoxStyle.OkOnly, "提示")
                  End
              End If
          End Sub
          Public Function zhouchang(ByVal w As Integer, ByVal h As Integer) As Integer
              zhouchang = 2 * (w + h)
          End Function
          Public Function area(ByVal w As Integer, ByVal h As Integer) As Double
              area = w * h
          End Function
      End Class
      測試類為:
      Public Class Form1
          Dim x, y As Integer
          Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
              Dim p As Integer
              Dim s As Double
              x = InputBox("輸入矩形的長度", "輸入", 1)
              y = InputBox("輸入矩形的高度", "輸入", 1)
              Dim a As New juxing(x, y)
              p = a.zhouchang(x, y)
              s = a.area(x, y)
              Console.WriteLine("矩形的兩邊為:" & x & "  " & y)
              Console.WriteLine("矩形的周長為:" & p)
              Console.WriteLine("矩形的面積為:" & 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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