副程式例

Public Class Form1

    Dim str1 = ""
    '主程式
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim i
        For i = 1 To 25
            f(i)
        Next
        MsgBox(str1)
    End Sub

    '副程式
    Sub f(ByVal n)
        Dim i
        Dim s = 1
        For i = 1 To n
            s = s * i
        Next
        str1 = str1 & n & "!=" & s & vbNewLine
    End Sub
End Class