form1.frm

好用啊

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "最大公数"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4965
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4965
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   615
      Left            =   3600
      TabIndex        =   2
      Top             =   2280
      Width           =   1095
   End
   Begin VB.TextBox Text2 
      Height          =   375
      Left            =   360
      TabIndex        =   1
      Text            =   "Text2"
      Top             =   1080
      Width           =   1815
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   360
      TabIndex        =   0
      Text            =   "Text1"
      Top             =   360
      Width           =   1695
   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()
    Dim m As Integer
    Dim n As Integer
    m = Text1.Text
    n = Text2.Text
    Caption = gcd(m, n)
End Sub
    Private Function gcd(m As Integer, n As Integer) As Integer
        Dim u As Integer
        Dim v As Integer
        Dim r As Integer
        u = m
        v = n
        Do While v <> 0
            r = u Mod v
            u = v
            v = r
        Loop
        gcd = u
    End Function