VB学习第十三周几种常见程序源代码

'(1)
Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.Load
        Dim x() = {4,5,3,6,1}
        Dim i As Integer
        Label1.Text = ""
        For i = 0 To UBound(x)
            Label1.Text &= Space(4) & x(i)
        Next
    End Sub
End Class
'(2)
Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.Load
        Dim x(9),y(9),z(9),i As Integer
        For i = 0 To UBound(x)
            x(i) = Int(Rnd() * (40 - 20 + 1) + 20)
            y(i) = Int(Rnd() * (40 - 20 + 1) + 20)
            z(i) = x(i) - y(i)
        Next
        Label4.Text = "" : Label5.Text = "" : Label6.Text = ""
        For i = 0 To UBound(x)
            Label4.Text &= Space(6 - Len(Str(x(i)))) & Str(x(i))
            Label5.Text &= Space(6 - Len(Str(y(i)))) & Str(y(i))
            Label6.Text &= Space(6 - Len(Str(z(i)))) & Str(z(i))
        Next
    End Sub
End Class
'(5)
Public Class Form1
    Dim scores(9) As Single
    Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
        Dim i As Integer
        For i = 0 To UBound(scores)
            scores(i) = InputBox("请输入第" & Str(i + 1) & "个评委的打分(0～10)","评委打分")
        Next
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button2.Click
        Dim result,smin,smax As Single
        Dim i As Integer
        result = 0 : smin = 10 : smax = 0
        For i = 0 To UBound(scores)
            If (scores(i) < smin) Then smin = scores(i)
            If (scores(i) > smax) Then smax = scores(i)
            result += scores(i)
        Next
        TextBox1.Text = Format((result - smin - smax) / 8,"0.0")
        'TextBox1.Text = Str((result - smin - smax) / 8)
    End Sub
End Class
'(6)
Public Class Form1
    Private Sub TextBox1_KeyPress(ByVal sender As Object,ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        Dim i,j,n As Integer
        If Asc(e.KeyChar) = 13 Then
            n = Val(TextBox1.Text)
            Dim a(n,n) As Integer
            For i = 1 To n                                     ' 形成杨辉三角形
                For j = 1 To i
                    a(i,j) = a(i - 1,j) + a(i - 1,j - 1)
                    If i = j Then a(i,j) = 1
                Next
            Next
            Label1.Text = ""
            For i = 1 To n                                      ' 显示右图
                Label1.Text &= Space(20 - i * 2)
                For j = 1 To i
                    Label1.Text &= a(i,j) & Space(5 - Len(Str(a(i,j))))
                Next
                Label1.Text &= vbCrLf
            Next
        End If
    End Sub
End Class
'(7)
Public Class Form1
    Private Sub TextBox3_KeyPress(ByVal sender As Object,ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox3.KeyPress
        Dim jsjResult As Single
        If Asc(e.KeyChar) = 13 Then
            Select Case ComboBox1.Text
                Case "＋"
                    jsjResult = Val(TextBox1.Text) + Val(TextBox2.Text)
                Case "－"
                    jsjResult = Val(TextBox1.Text) - Val(TextBox2.Text)
                Case "×"
                    jsjResult = Val(TextBox1.Text) * Val(TextBox2.Text)
                Case "÷"
                    jsjResult = Val(TextBox1.Text) / Val(TextBox2.Text)
            End Select

            If jsjResult = Val(TextBox3.Text) Then
                Label2.Text = "恭喜答案正确"
            Else
                Label2.Text = "错误，正确答案为" & jsjResult
            End If
        End If
    End Sub
End Class

（编辑：李大同）

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