vb.net计算器

Public Class Form1
Private Sub 输入(数值 As String)
If TextBox1.Text = "0" Then
TextBox1.Text = 数值
Else TextBox1.Text &= 数值
End If
End Sub
Dim 上一次的值 As Double
Dim 运算符 As String
Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Number9.Click
输入(9)
End Sub

Private Sub Number1_Click(sender As Object, e As EventArgs) Handles Number1.Click
输入(1)
End Sub

Private Sub Number2_Click(sender As Object, e As EventArgs) Handles Number2.Click
输入(2)
End Sub

Private Sub Number3_Click(sender As Object, e As EventArgs) Handles Number3.Click
输入(3)
End Sub

Private Sub Number4_Click(sender As Object, e As EventArgs) Handles Number4.Click
输入(4)
End Sub

Private Sub Number5_Click(sender As Object, e As EventArgs) Handles Number5.Click
输入(5)
End Sub

Private Sub Number6_Click(sender As Object, e As EventArgs) Handles Number6.Click
输入(6)
End Sub

Private Sub Number7_Click(sender As Object, e As EventArgs) Handles Number7.Click
输入(7)
End Sub

Private Sub Number8_Click(sender As Object, e As EventArgs) Handles Number8.Click
输入(8)
End Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
If Not IsNumeric(TextBox1.Text) Then
MsgBox("输入的值有误",, "提示")
Return
End If
上一次的值 = TextBox1.Text
运算符 = "+"
TextBox1.Text = "0"
End Sub

Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
If Not IsNumeric(TextBox1.Text) Then
MsgBox("输入的值有误",, "提示")
Return
End If
上一次的值 = TextBox1.Text
运算符 = "-"
TextBox1.Text = "0"
End Sub

Private Sub Button5_Click_1(sender As Object, e As EventArgs) Handles Button5.Click
If Not IsNumeric(TextBox1.Text) Then
MsgBox("输入的值有误",, "提示")
Return
End If
上一次的值 = TextBox1.Text
运算符 = "*"
TextBox1.Text = "0"
End Sub

Private Sub Number0_Click(sender As Object, e As EventArgs) Handles Number0.Click
If TextBox1.Text <> "0" Then
TextBox1.Text &= 0
End If
End Sub

Private Sub Button0_Click(sender As Object, e As EventArgs) Handles Button0.Click
TextBox1.Text &= "."
End Sub

Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
If Not IsNumeric(TextBox1.Text) Then
MsgBox("输入的值有误",, "提示")
Return
End If
上一次的值 = TextBox1.Text
运算符 = "/"
TextBox1.Text = "0"
End Sub

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

End Sub

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
If Not IsNumeric(TextBox1.Text) Then
MsgBox("输入的值有误",, "提示")
End If
Select Case 运算符
Case "+"
TextBox1.Text = 上一次的值 + CDbl(TextBox1.Text)
Case "-"
TextBox1.Text = 上一次的值 - CDbl(TextBox1.Text)
Case "*"
TextBox1.Text = 上一次的值 * CDbl(TextBox1.Text)
Case "/"
TextBox1.Text = 上一次的值 / CDbl(TextBox1.Text)

End Select
End Sub
End Class