例7.7.frm

一本学习Visual Basic编程的好书

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Form_Load()
   Dim n As Integer, m As Double
   Show
   n = Val(InputBox("输入1～15之间的整数"))
   If n < 1 Or n > 15 Then
       MsgBox "错误数据", 0, "检查数据"
       End
   End If
   m = fac(n)
   Print n; "!= "; m
End Sub
Private Function fac(n) As Double
   If n > 1 Then
       fac = n * fac(n - 1)        '递归调用
   Else
       fac = 1                     'n=1时，结束递归
   End If
End Function