已知圆半径和圆柱的高，计算圆柱体积和表面积。

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Const PI = 3.14159
        Dim r As Integer, h As Integer
        Dim t As Single, s As Single
        r = Val(TextBox1.Text)
        h = Val(TextBox2.Text)
        t = PI * r * r * h
        s = 2 * PI * r * h + 2 * PI * r * r
        Label3.Text = "体积=" & Format(t, "0.000")
        Label4.Text = "表面积=" & Format(s, "0.000")

    End Sub
End Class