VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3090
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3090
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text1 
      Height          =   1095
      Left            =   600
      TabIndex        =   0
      Top             =   240
      Width           =   3615
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Text1_Change()
Dim n As Integer, t As Double
t = 1
i = 1
top:
n = InputBox("輸入值", 0, 0)
If n <= 0 Then
MsgBox "輸入值錯誤", 0, "請輸入正值"
GoTo top
Else
For i = 1 To n
t = t * i
Next
End If
Text1.Text = t

End Sub