例2-22.frm

Visual Basic程序设计基础》-杨小影-源代码

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3555
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4215
   LinkTopic       =   "Form1"
   ScaleHeight     =   3555
   ScaleWidth      =   4215
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton result 
      Caption         =   "="
      Height          =   495
      Left            =   2880
      TabIndex        =   16
      Top             =   1680
      Width           =   735
   End
   Begin VB.CommandButton clear 
      Caption         =   "cls"
      Height          =   495
      Left            =   2880
      TabIndex        =   15
      Top             =   1080
      Width           =   735
   End
   Begin VB.CommandButton operator 
      Caption         =   "/"
      Height          =   495
      Index           =   3
      Left            =   2880
      TabIndex        =   14
      Top             =   2880
      Width           =   735
   End
   Begin VB.CommandButton operator 
      Caption         =   "x"
      Height          =   495
      Index           =   2
      Left            =   2880
      TabIndex        =   13
      Top             =   2280
      Width           =   735
   End
   Begin VB.CommandButton operator 
      Caption         =   "-"
      Height          =   495
      Index           =   1
      Left            =   2040
      TabIndex        =   12
      Top             =   2880
      Width           =   735
   End
   Begin VB.CommandButton operator 
      Caption         =   "+"
      Height          =   495
      Index           =   0
      Left            =   1200
      TabIndex        =   11
      Top             =   2880
      Width           =   735
   End
   Begin VB.CommandButton number 
      Caption         =   "5"
      Height          =   495
      Index           =   5
      Left            =   2040
      TabIndex        =   10
      Top             =   1680
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "4"
      Height          =   495
      Index           =   4
      Left            =   1320
      TabIndex        =   9
      Top             =   1680
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "3"
      Height          =   495
      Index           =   3
      Left            =   600
      TabIndex        =   8
      Top             =   1680
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "9"
      Height          =   495
      Index           =   9
      Left            =   600
      TabIndex        =   7
      Top             =   2880
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "8"
      Height          =   495
      Index           =   8
      Left            =   2040
      TabIndex        =   6
      Top             =   2280
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "7"
      Height          =   495
      Index           =   7
      Left            =   1320
      TabIndex        =   5
      Top             =   2280
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "6"
      Height          =   495
      Index           =   6
      Left            =   600
      TabIndex        =   4
      Top             =   2280
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "2"
      Height          =   495
      Index           =   2
      Left            =   2040
      TabIndex        =   3
      Top             =   1080
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "1"
      Height          =   495
      Index           =   1
      Left            =   1320
      TabIndex        =   2
      Top             =   1080
      Width           =   495
   End
   Begin VB.CommandButton number 
      Caption         =   "0"
      Height          =   495
      Index           =   0
      Left            =   600
      TabIndex        =   1
      Top             =   1080
      Width           =   495
   End
   Begin VB.Label dataout 
      Alignment       =   1  'Right Justify
      Appearance      =   0  'Flat
      BackColor       =   &H80000005&
      ForeColor       =   &H80000008&
      Height          =   615
      Left            =   600
      TabIndex        =   0
      Top             =   120
      Width           =   2895
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim op1 As Byte                          '用来记录前面输入的操作符
Dim ops1&, ops2&                         '两个操作数
Dim res   As Boolean                     '标志是否已算出结果

Private Sub Clear_Click()
dataout.Caption = " "
End Sub

Private Sub Form_Load()
res = False
End Sub

'按下数字键0~9的事件过程
Private Sub number_Click(i1 As Integer)
If Not res Then
dataout.Caption = dataout.Caption & i1
Else
dataout.Caption = i1
res = False
End If
End Sub
'按下操作键+、-、ⅹ、∕的事件过程
Private Sub Operator_Click(i2 As Integer)
   ops1 = dataout.Caption
   op1 = i2                           '记下对应的操作符
   dataout.Caption = " "
End Sub

'按下"="键的事件过程
Private Sub result_Click()
ops2 = dataout.Caption
Select Case op1
Case 0
         dataout.Caption = ops1 + ops2
Case 1
         dataout.Caption = ops1 - ops2
Case 2
         dataout.Caption = ops1 * ops2
Case 3
         dataout.Caption = ops1 / ops2
End Select
res = True
End Sub