例2-24.frm

Visual Basic程序设计基础》-杨小影-源代码

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_Click()
   Dim n As Integer, Sum As Long
   Sum = 0
   n = InputBox("输入N的大小：", "数据输入")
   For i = 1 To n                           '构造循环来求和
       Sum = Sum + Func(i)                 '调用函数求i的阶乘
   Next i
   Print "Sum="; Sum
End Sub

Function Func(ByVal n As Integer) As Long
Dim i As Integer
    Func = 1
    For i = 1 To n                          '构造循环求n的阶乘
        Func = Func * i
    Next i
 End Function