calculator.frm

关于数据库的开发

         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   360
      TabIndex        =   2
      Top             =   2880
      Width           =   615
   End
   Begin VB.CommandButton cmd0 
      Caption         =   "0"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   1200
      TabIndex        =   1
      Top             =   3600
      Width           =   615
   End
   Begin VB.Label lblCalc 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00FFFFFF&
      BorderStyle     =   1  'Fixed Single
      Caption         =   "0"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   735
      Left            =   360
      TabIndex        =   0
      Top             =   360
      Width           =   4335
   End
End
Attribute VB_Name = "frmcalc"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim Operator As String
Dim Operand1 As Single
Dim Operand2 As Single
Dim flag     As Integer
                                
                                
Private Sub cmd0_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd0.Caption
        Else
            lblCalc.Caption = Me.cmd0.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd0.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd1_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd1.Caption
        Else
            lblCalc.Caption = Me.cmd1.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd1.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd2_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd2.Caption
        Else
            lblCalc.Caption = Me.cmd2.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd2.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd3_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd3.Caption
        Else
            lblCalc.Caption = Me.cmd3.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd3.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd4_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd4.Caption
        Else
            lblCalc.Caption = Me.cmd4.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd4.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd5_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd5.Caption
        Else
            lblCalc.Caption = Me.cmd5.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd5.Caption
            flag = 0
        End If
    End If

End Sub

Private Sub cmd6_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd6.Caption
        Else
            lblCalc.Caption = Me.cmd6.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd6.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd7_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd7.Caption
        Else
            lblCalc.Caption = Me.cmd7.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd7.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd8_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd8.Caption
        Else
            lblCalc.Caption = Me.cmd8.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd8.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmd9_Click()
    If flag = 0 Then
        If Val(lblCalc.Caption) <> 0 Or InStr(1, lblCalc.Caption, ".") > 0 Then
            lblCalc.Caption = lblCalc.Caption + Me.cmd9.Caption
        Else
            lblCalc.Caption = Me.cmd9.Caption
        End If
    Else
        If flag = 1 Then
            lblCalc.Caption = Me.cmd9.Caption
            flag = 0
        End If
    End If
End Sub

Private Sub cmdAdd_Click()
    flag = 1
    Operator = "+"
    Operand1 = Val(lblCalc.Caption)
End Sub


Private Sub cmdCE_Click()
    Operand2 = 0
    lblCalc.Caption = "0"
    flag = 1
End Sub

Private Sub CmdClear_Click()
    lblCalc.Caption = "0"
    Operand1 = 0
    Operand2 = 0
    Operator = ""
    flag = 0
End Sub

Private Sub cmdDiv_Click()
    flag = 1
    Operator = "/"
    Operand1 = Val(lblCalc.Caption)
End Sub

Private Sub cmdDot_Click()
    If InStr(1, lblCalc.Caption, ".") = 0 Then
        lblCalc.Caption = lblCalc.Caption + "."
    End If
End Sub

Private Sub cmdMlt_Click()
    flag = 1
    Operator = "*"
    Operand1 = Val(lblCalc.Caption)
End Sub




Private Sub cmdRslt_Click()
    Dim result As Single
    If Operator <> "" Then
        Operand2 = Val(lblCalc.Caption)
        Select Case Operator
            Case "+"
                lblCalc.Caption = Operand1 + Operand2
            Case "-"
                lblCalc.Caption = Operand1 - Operand2
            Case "*"
                lblCalc.Caption = Operand1 * Operand2
            Case "/"
                If Operand2 = 0 Then
                    lblCalc.Caption = "除数不能为零"
                Else
                    lblCalc.Caption = Operand1 / Operand2
                End If
        End Select
        Operator = ""
    End If
    flag = 1
End Sub

Private Sub cmdSign_Click()
    If Left(lblCalc.Caption, 1) = "-" Then
        lblCalc.Caption = Right(lblCalc.Caption, Len(lblCalc.Caption) - 1)
    Else
        If Val(lblCalc.Caption) <> 0 Then
            lblCalc.Caption = "-" + lblCalc.Caption
        End If
    End If
End Sub



Private Sub cmdSub_Click()
    flag = 1
    Operator = "-"
    Operand1 = Val(lblCalc.Caption)
End Sub

Private Sub Form_Load()
    Me.Caption = "My Calculator"
    lblCalc.Caption = "0"
    Operand1 = 0
    Operand2 = 0
    Operator = ""
    flag = 0
End Sub