3-9.frm

Visual Basic课程举例1 有很好的例题

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "3-9"
   ClientHeight    =   2970
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4080
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   12
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   ScaleHeight     =   2970
   ScaleWidth      =   4080
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "求S值"
      Height          =   375
      Left            =   360
      TabIndex        =   4
      Top             =   1320
      Width           =   3135
   End
   Begin VB.TextBox Text2 
      Height          =   375
      Left            =   2400
      TabIndex        =   3
      Top             =   720
      Width           =   735
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   720
      TabIndex        =   0
      Top             =   720
      Width           =   735
   End
   Begin VB.Label Label4 
      Appearance      =   0  'Flat
      BackColor       =   &H80000005&
      BorderStyle     =   1  'Fixed Single
      ForeColor       =   &H80000008&
      Height          =   735
      Left            =   360
      TabIndex        =   5
      Top             =   1800
      Width           =   3135
      WordWrap        =   -1  'True
   End
   Begin VB.Label Label2 
      Caption         =   "n"
      Height          =   255
      Left            =   2520
      TabIndex        =   2
      Top             =   360
      Width           =   375
   End
   Begin VB.Label Label1 
      Caption         =   "a"
      Height          =   255
      Left            =   720
      TabIndex        =   1
      Top             =   360
      Width           =   735
   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()
    a = Val(Text1)
    n = Val(Text2)
    b = 0
    For i = 1 To n
        b = b * 10 + a
        s = s + b
    Next i
    Label4.Caption = "S=" & Format(s)
End Sub