例4.8.frm

vb编程+从基础到实践光盘代码

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   4095
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6105
   LinkTopic       =   "Form1"
   ScaleHeight     =   4095
   ScaleWidth      =   6105
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "算算我得多少？"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   735
      Left            =   2040
      TabIndex        =   0
      Top             =   3000
      Width           =   2295
   End
   Begin VB.Label Label1 
      Alignment       =   2  'Center
      AutoSize        =   -1  'True
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   14.25
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   285
      Left            =   3105
      TabIndex        =   1
      Top             =   1920
      Width           =   165
   End
   Begin VB.Image Image1 
      Height          =   1275
      Left            =   120
      Picture         =   "例4.8.frx":0000
      Stretch         =   -1  'True
      Top             =   120
      Width           =   5805
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Function Factorial(n As Long) As Long
    Dim nTemp As Long
    If n = 0 Or n = 1 Then
        nTemp = 1
    Else
        nTemp = n * Factorial(n - 1)                          '进行递归调用
    End If
    Factorial = nTemp
End Function

Private Sub Command1_Click()
    n& = InputBox("请输入非负整数", "公式计算")                 '输入一个数，求它的阶乘
    Label1.Caption = "n=" & n & "   n!=" & Factorial(n)
End Sub