求s.frm

来自「算法教案」· FRM 代码 · 共 70 行

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "阶乘"
   ClientHeight    =   2865
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   4560
   LinkTopic       =   "Form1"
   ScaleHeight     =   2865
   ScaleWidth      =   4560
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text2 
      Height          =   375
      Left            =   2040
      Locked          =   -1  'True
      TabIndex        =   4
      Top             =   1200
      Width           =   1935
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   2040
      TabIndex        =   2
      Top             =   480
      Width           =   1935
   End
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      Height          =   495
      Left            =   1800
      TabIndex        =   0
      Top             =   2040
      Width           =   975
   End
   Begin VB.Label Label1 
      Caption         =   "结果："
      Height          =   255
      Left            =   480
      TabIndex        =   3
      Top             =   1320
      Width           =   975
   End
   Begin VB.Label Label2 
      Caption         =   "输入正整数n："
      Height          =   255
      Left            =   360
      TabIndex        =   1
      Top             =   600
      Width           =   1335
   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 i, n As Integer
    Dim j, s As Double
    j = 1
    s = 1
    n = Val(Text1.Text)
    For i = 2 To n
        j = j / ((2 * i - 1) * (2 * i - 2))
        s = s + ((-1) ^ (i - 1)) * j
    Next i
    Text2.Text = Str(s)
End Sub