如何用VB编写一个加减乘除计算器？只要代码!

Option Explicit Dim Op1, Op2 Dim DecimalFlag As Integer Dim NumOps As Integer Dim LastInput Dim OpFlag Dim TempReadout Private Sub Cancel_Click() Readout = Format(0, "0.") Op1 = 0 Op2 = 0 Form_Load End Sub Private Sub CancelEntry_Click() Readout = Format(0, "0.") DecimalFlag = False LastInput = "CE" End Sub Private Sub Decimal_Click() If LastInput = "NEG" Then Readout = Format(0, "-0.") ElseIf LastInput <> "NUMS" Then Readout = Format(0, "0.") End If DecimalFlag = True LastInput = "NUMS" End Sub Private Sub Form_Load() DecimalFlag = False NumOps = 0 LastInput = "NONE" OpFlag = " " Readout = Format(0, "0.") 'Decimal.Caption = Format(0, ".") End Sub Private Sub Number_Click(Index As Integer) If LastInput <> "NUMS" Then Readout = Format(0, ".") DecimalFlag = False End If If DecimalFlag Then Readout = Readout + Number(Index).Caption Else Readout = Left(Readout, InStr(Readout, Format(0, ".")) - 1) + Number(Index).Caption + Format(0, ".") End If If LastInput = "NEG" Then Readout = "-" & Readout LastInput = "NUMS" End Sub Private Sub Operator_Click(Index As Integer) TempReadout = Readout If LastInput = "NUMS" Then NumOps = NumOps + 1 End If Select Case NumOps Case 0 If Operator(Index).Caption = "-" And LastInput <> "NEG" Then Readout = "-" & Readout LastInput = "NEG" End If Case 1 Op1 = Readout If Operator(Index).Caption = "-" And LastInput <> "NUMS" And OpFlag <> "=" Then Readout = "-" LastInput = "NEG" End If Case 2 Op2 = TempReadout Select Case OpFlag Case "+" Op1 = CDbl(Op1) + CDbl(Op2) Case "-" Op1 = CDbl(Op1) - CDbl(Op2) Case "X" Op1 = CDbl(Op1) * CDbl(Op2) Case "/" If Op2 = 0 Then MsgBox "除数不能为 0", 48, "计算器" Else Op1 = CDbl(Op1) / CDbl(Op2) End If Case "=" Op1 = CDbl(Op2) Case "%" Op1 = CDbl(Op1) * CDbl(Op2) End Select Readout = Op1 NumOps = 1 End Select If LastInput <> "NEG" Then LastInput = "OPS" OpFlag = Operator(Index).Caption End If End Sub Private Sub Percent_Click() Readout = Readout / 100 LastInput = "Ops" OpFlag = "%" NumOps = NumOps + 1 DecimalFlag = True End Sub 窗体代码 VERSION 5.00 Begin VB.Form Calculator BorderStyle = 1 'Fixed Single Caption = "计算器" ClientHeight = 2970 ClientLeft = 2580 ClientTop = 1485 ClientWidth = 3270 ClipControls = 0 'False BeginProperty Font Name = "System" Size = 9.75 Charset = 0 Weight = 700 Underline = 0 'False Italic = 0 'False Strikethrough = 0 'False EndProperty Icon = "CALC.frx":0000 LinkMode = 1 'Source LinkTopic = "Form1" MaxButton = 0 'False PaletteMode = 1 'UseZOrder ScaleHeight = 2970 ScaleWidth = 3270 WhatsThisHelp = -1 'True Begin VB.CommandButton Number Caption = "7" Height = 480 Index = 7 Left = 120 TabIndex = 7 Top = 600 Width = 480 End Begin VB.CommandButton Number Caption = "8" Height = 480 Index = 8 Left = 720 TabIndex = 8 Top = 600 Width = 480 End Begin VB.CommandButton Number Caption = "9" Height = 480 Index = 9 Left = 1320 TabIndex = 9 Top = 600 Width = 480 End Begin VB.CommandButton Cancel Caption = "C" Height = 480 Left = 2040 TabIndex = 10 Top = 600 Width = 480 End Begin VB.CommandButton CancelEntry Caption = "CE" Height = 480 Left = 2640 TabIndex = 11 Top = 600 Width = 480 End Begin VB.CommandButton Number Caption = "4" Height = 480 Index = 4 Left = 120 TabIndex = 4 Top = 1200 Width = 480 End Begin VB.CommandButton Number Caption = "5" Height = 480 Index = 5 Left = 720 TabIndex = 5 Top = 1200 Width = 480 End Begin VB.CommandButton Number Caption = "6" Height = 480 Index = 6 Left = 1320 TabIndex = 6 Top = 1200 Width = 480 End Begin VB.CommandButton Operator Caption = "+" Height = 480 Index = 1 Left = 2040 TabIndex = 12 Top = 1200 Width = 480 End Begin VB.CommandButton Operator Caption = "-" Height = 480 Index = 3 Left = 2640 TabIndex = 13 Top = 1200 Width = 480 End Begin VB.CommandButton Number Caption = "1" Height = 480 Index = 1 Left = 120 TabIndex = 1 Top = 1800 Width = 480 End Begin VB.CommandButton Number Caption = "2" Height = 480 Index = 2 Left = 720 TabIndex = 2 Top = 1800 Width = 480 End Begin VB.CommandButton Number Caption = "3" Height = 480 Index = 3 Left = 1320 TabIndex = 3 Top = 1800 Width = 480 End Begin VB.CommandButton Operator Caption = "X" Height = 480 Index = 2 Left = 2040 TabIndex = 14 Top = 1800 Width = 480 End Begin VB.CommandButton Operator Caption = "/" Height = 480 Index = 0 Left = 2640 TabIndex = 15 Top = 1800 Width = 480 End Begin VB.CommandButton Number Caption = "0" Height = 480 Index = 0 Left = 120 TabIndex = 0 Top = 2400 Width = 1080 End Begin VB.CommandButton Decimal Caption = "." Height = 480 Left = 1320 TabIndex = 18 Top = 2400 Width = 480 End Begin VB.CommandButton Operator Caption = "=" Height = 480 Index = 4 Left = 2040 TabIndex = 16 Top = 2400 Width = 480 End Begin VB.CommandButton Percent Caption = "%" Height = 480 Left = 2640 TabIndex = 17 Top = 2400 Width = 480 End Begin VB.Label Readout Alignment = 1 'Right Justify BackColor = &H0000FFFF& BorderStyle = 1 'Fixed Single Caption = "0." BeginProperty Font Name = "MS Sans Serif" Size = 12 Charset = 0 Weight = 700 Underline = 0 'False Italic = 0 'False Strikethrough = 0 'False EndProperty ForeColor = &H00000000& Height = 375 Left = 120 TabIndex = 19 Top = 105 Width = 3000 End End Attribute VB_Name = "Calculator" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False本回答被提问者采纳