最大公约数函数定义.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[8-4]求最大公约数"
   ClientHeight    =   1515
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5430
   LinkTopic       =   "Form1"
   ScaleHeight     =   1515
   ScaleWidth      =   5430
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "求最大公约数"
      Height          =   495
      Left            =   2786
      TabIndex        =   5
      Top             =   828
      Width           =   2415
   End
   Begin VB.TextBox Text2 
      Height          =   495
      Left            =   1309
      TabIndex        =   3
      Top             =   791
      Width           =   1215
   End
   Begin VB.TextBox Text1 
      Height          =   495
      Left            =   1309
      TabIndex        =   2
      Top             =   191
      Width           =   1215
   End
   Begin VB.Label Label4 
      BorderStyle     =   1  'Fixed Single
      Height          =   495
      Left            =   3986
      TabIndex        =   6
      Top             =   191
      Width           =   1215
   End
   Begin VB.Label Label3 
      Caption         =   "最大公约数为："
      Height          =   495
      Left            =   2756
      TabIndex        =   4
      Top             =   198
      Width           =   1335
   End
   Begin VB.Label Label2 
      Caption         =   "请输入数二："
      Height          =   495
      Left            =   229
      TabIndex        =   1
      Top             =   791
      Width           =   1215
   End
   Begin VB.Label Label1 
      Caption         =   "请输入数一："
      Height          =   495
      Left            =   229
      TabIndex        =   0
      Top             =   191
      Width           =   1215
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
  Dim a As Integer, b As Integer, x As Integer
  a = Val(Text1.Text)
  b = Val(Text2.Text)
  If a < b Then     '保证a>=b
     x = a
     a = b
     b = x
  End If
  Label4.Caption = Str(gcd(a, b))  '调用函数gcd求最大公约数
End Sub
  
  '求最大公约数的函数
Function gcd(ByVal x As Integer, ByVal y As Integer) As Integer
  Dim ret As Integer
  Do While y <> 0
    ret = x Mod y
    x = y
    y = ret
  Loop
  gcd = x
End Function