例4.11.frm

一本学习Visual Basic编程的好书

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "四则运算"
   ClientHeight    =   2985
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5280
   LinkTopic       =   "Form1"
   ScaleHeight     =   2985
   ScaleWidth      =   5280
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command3 
      Caption         =   "结束"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   3840
      TabIndex        =   12
      Top             =   1440
      Width           =   975
   End
   Begin VB.CommandButton Command2 
      Caption         =   "清除"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   3840
      TabIndex        =   11
      Top             =   840
      Width           =   975
   End
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   3840
      TabIndex        =   6
      Top             =   240
      Width           =   975
   End
   Begin VB.OptionButton Option4 
      Caption         =   "/"
      Height          =   375
      Left            =   1680
      TabIndex        =   5
      Top             =   1200
      Width           =   495
   End
   Begin VB.OptionButton Option3 
      Caption         =   "*"
      Height          =   375
      Left            =   1680
      TabIndex        =   4
      Top             =   840
      Width           =   495
   End
   Begin VB.OptionButton Option2 
      Caption         =   "-"
      Height          =   375
      Left            =   1680
      TabIndex        =   3
      Top             =   480
      Width           =   495
   End
   Begin VB.OptionButton Option1 
      Caption         =   "+"
      Height          =   375
      Left            =   1680
      TabIndex        =   2
      Top             =   120
      Width           =   495
   End
   Begin VB.TextBox Text2 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   2520
      TabIndex        =   1
      Top             =   720
      Width           =   855
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   360
      TabIndex        =   0
      Top             =   720
      Width           =   855
   End
   Begin VB.TextBox Text3 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   240
      TabIndex        =   8
      Top             =   2280
      Width           =   3735
   End
   Begin VB.Label Label2 
      Caption         =   "第二个数"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   2520
      TabIndex        =   10
      Top             =   360
      Width           =   855
   End
   Begin VB.Label Label1 
      Caption         =   "第一个数"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   480
      TabIndex        =   9
      Top             =   360
      Width           =   855
   End
   Begin VB.Label Label3 
      Caption         =   "算式及运算结果"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   240
      TabIndex        =   7
      Top             =   2040
      Width           =   1695
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Form_Load()
    Option1.Value = True        '默认为“+”运算
End Sub
Private Sub Command1_Click()    '“计算”按钮
    Dim a As Single, b As Single, t As Single, s As String
    a = Val(Text1.Text)
    b = Val(Text2.Text)
    Select Case True
       Case Option1.Value       ' + 运算
          s = "+"
          t = a + b
       Case Option2.Value       ' - 运算
          s = "-"
          t = a - b
       Case Option3.Value       ' * 运算
          s = "*"
          t = a * b
       Case Option4.Value       ' / 运算
          s = "/"
          t = a / b
    End Select
    Text3.Text = a & s & b & "=" & t
End Sub
Private Sub Command2_Click()
    Text1.Text = ""
    Text2.Text = ""
    Text3.Text = ""
End Sub

Private Sub Command3_Click()
    End
End Sub