求阶乘过程.frm

蒋加伏主编VB程序设计第四版PPT及全部课本源码 北京邮电大学出版社 Visual Basic 程序设计教程（第四版） 主编 蒋加伏 张林峰 找了好久的（不带密码的）

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "例[8-1]子过程——求n!"
   ClientHeight    =   1455
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4215
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   15
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   ScaleHeight     =   1455
   ScaleWidth      =   4215
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "确定"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   2760
      TabIndex        =   3
      Top             =   885
      Width           =   1215
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   1920
      TabIndex        =   0
      Top             =   885
      Width           =   615
   End
   Begin VB.Label Label1 
      Caption         =   "请输入一个正整数："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   180
      TabIndex        =   2
      Top             =   1005
      Width           =   1695
   End
   Begin VB.Label Label2 
      Alignment       =   2  'Center
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   120
      TabIndex        =   1
      Top             =   360
      Width           =   3855
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Sub Command1_Click()
 Call N(Val(Text1.Text))
End Sub
 '求阶乘n!的子过程
Public Sub N(a As Integer)
Dim i As Integer
Dim f As Double
f = 1
For i = 1 To a
  f = f * i
Next i
Form1.Label2.Caption = Str(a) & "！的值为：" & Str(f)
End Sub