Calculadora en Visual Basic 6.0

Dim num1 As Double
Dim num2 As Double
Dim signo As String

Private Sub Borrar_Click()
Text1.Text = ""
End Sub

Private Sub Sumar_Click()
signo = "+"
num1 = Text1.Text
Text1.Text = ""
End Sub

Private Sub Restar_Click()
signo = "-"
num1 = Text1.Text
Text1.Text = ""
End Sub

Private Sub Multiplicar_Click()
signo = "X"
num1 = Text1.Text
Text1.Text = ""
End Sub

Private Sub Dividir_Click()
signo = "/"
num1 = Text1.Text
Text1.Text = ""
End Sub

Private Sub Igual_Click()
num2 = Text1.Text

If signo = "+" Then
         Text1.Text = num1 + num2
End If

If signo = "-" Then
          Text1.Text = num1 - num2
End If

If signo = "X" Then
          Text1.Text = num1 * num2
End If

If signo = "/" Then
    If num2 = 0 Then
        MsgBox "Error"
             Text1.Text = ""
    Else
            Text1.Text = num1 / num2
       
    End If
End If

If signo = "^" Then
          Text1.Text = num1 ^ num2
End If
End Sub

Private Sub SQR_Click()
num1 = Text1.Text
Text1.Text = Sqr(num1)
End Sub

Private Sub Porcentaje_Click()
num2 = Text1.Text
Text1.Text = (num1 * num2) / 100

End Sub

Private Sub Potencia_Click()
signo = "^"
num1 = Text1.Text
Text1.Text = ""
End Sub

Private Sub Command1_Click(Index As Integer)
Text1.Text = Text1.Text + Command1(Index).Caption
End Sub