各种形式求1到100平方和.frm

Visual Basic课程举例1 有很好的例题

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "6种循环求1到100平方和"
   ClientHeight    =   4440
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6015
   LinkTopic       =   "Form1"
   ScaleHeight     =   4440
   ScaleWidth      =   6015
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton cmdDoLoopUntil 
      Caption         =   "Do       Loop Until"
      BeginProperty Font 
         Name            =   "Arial Black"
         Size            =   18
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   975
      Left            =   480
      TabIndex        =   6
      Top             =   2100
      Width           =   2355
   End
   Begin VB.CommandButton cmdDoLoop 
      Caption         =   "Do            Loop"
      BeginProperty Font 
         Name            =   "Arial Black"
         Size            =   18
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   975
      Left            =   480
      TabIndex        =   5
      Top             =   3180
      Width           =   2355
   End
   Begin VB.CommandButton CmdForNext 
      Caption         =   "For          Next"
      BeginProperty Font 
         Name            =   "Arial Black"
         Size            =   18
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   975
      Left            =   3060
      TabIndex        =   4
      Top             =   3180
      Width           =   2355
   End
   Begin VB.CommandButton CmdDoUntilLoop 
      Caption         =   "Do Until     Loop"
      BeginProperty Font 
         Name            =   "Arial Black"
         Size            =   18
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   975
      Left            =   3060
      TabIndex        =   3
      Top             =   960
      Width           =   2355
   End
   Begin VB.CommandButton CmdDoLoopWhile 
      Caption         =   "Do           Loop While"
      BeginProperty Font 
         Name            =   "Arial Black"
         Size            =   18
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   975
      Left            =   3060
      TabIndex        =   2
      Top             =   2100
      Width           =   2355
   End
   Begin VB.CommandButton CmdDoWhileLoop 
      Caption         =   "Do While   Loop"
      BeginProperty Font 
         Name            =   "Arial Black"
         Size            =   18
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   975
      Left            =   480
      TabIndex        =   1
      Top             =   960
      Width           =   2355
   End
   Begin VB.Label Label1 
      Caption         =   "1234"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   21.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   615
      Left            =   540
      TabIndex        =   0
      Top             =   180
      Width           =   4815
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False

Private Sub cmdDoLoop_Click()
    Dim I%, T&
    Do
      T = T + I * I: I = I + 1
      If I > 100 Then Exit Do
    Loop
    Label1.Caption = Format(T)
End Sub

Private Sub cmdDoLoopUntil_Click()
    Dim I%, T&
    Do
      T = T + I * I: I = I + 1
    Loop Until I > 100
    Label1.Caption = Format(T)
End Sub

Private Sub cmdDoLoopWhile_Click()
    Dim I%, T&
    Do
      T = T + I * I: I = I + 1
    Loop While I <= 100
    Label1.Caption = Format(T)
End Sub

Private Sub cmdDoUntilLoop_Click()
    Dim I%, T&
    Do Until I > 100
      T = T + I * I: I = I + 1
    Loop
    Label1.Caption = Format(T)
End Sub

Private Sub cmdDoWhileLoop_Click()
    Dim I%, T&
    Do While I <= 100
      T = T + I * I: I = I + 1
    Loop
    Label1.Caption = Format(T)
End Sub

Private Sub CmdForNext_Click()
    Dim I%, T&
    For I = 0 To 100
      T = T + I * I
    Next I
    Label1.Caption = Format(T)
End Sub

Private Sub Label1_Click()
Label1.Caption = ""
End Sub