Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label2.Text = Val(TextBox1.Text) + Val(TextBox2.Text)
Label1.Text = "＋"
Label3.Text = "="
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Label2.Text = Val(TextBox1.Text) - Val(TextBox2.Text)
Label1.Text = "－"
Label3.Text = "="
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Label2.Text = Val(TextBox1.Text) * Val(TextBox2.Text)
Label1.Text = "＊"
Label3.Text = "="
End Sub

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

Label1.Text = "／"
Label3.Text = "="
If Val(TextBox2.Text) = 0 Then
Label2.Text = "錯誤"
Else
Label2.Text = Val(TextBox1.Text) / Val(TextBox2.Text)
Exit Sub
End If
End Sub


End Class