Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim (1), (2) As Short
        (1) = TextBox1.Text
        (1) = TextBox2.Text
        If RadioButton1.Checked Then
            TextBox3.Text = Int((1) + (2))
        Else
            TextBox3.Text = Int((1) - (2))
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim (1), (2) ,(3) As Short
        (2)  = TextBox1.Text
        (3) = TextBox2.Text
        Select Case (1)
            Case RadioButton1.Checked
                TextBox3.Text = Int((2) - (3))
            Case Else
                TextBox3.Text = Int((2) + (3))
        End Select
    End Sub
End Class