Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label2.Text = Val(TextBox2.Text) + Val(TextBox1.Text)
Label1.Text = "+"
’ 加法

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Label2.Text = Val(TextBox2.Text) - Val(TextBox1.Text)
Label1.Text = "-"
’ 減法

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Label2.Text = Val(TextBox2.Text) * Val(TextBox1.Text)
Label1.Text = "*"
’乘法

End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click

Label2.Text = Val(TextBox2.Text) / Val(TextBox1.Text)
Label1.Text = "/"
’除法