📄 form1.frm
字号:
VERSION 5.00
Begin VB.Form Form1
Caption = "简易计算器"
ClientHeight = 6015
ClientLeft = 60
ClientTop = 450
ClientWidth = 6315
LinkTopic = "Form1"
ScaleHeight = 6015
ScaleWidth = 6315
StartUpPosition = 3 'Windows Default
Begin VB.Frame Frame1
Caption = "计算器"
Height = 5655
Left = 120
TabIndex = 0
Top = 240
Width = 6015
Begin VB.CommandButton Operator
Caption = "="
Height = 495
Index = 19
Left = 4920
TabIndex = 25
Top = 3960
Width = 615
End
Begin VB.CommandButton Percent
Caption = "%"
Height = 495
Index = 18
Left = 4920
TabIndex = 24
Top = 3120
Width = 615
End
Begin VB.CommandButton Countdown
Caption = "1/x"
Height = 495
Index = 17
Left = 4920
TabIndex = 23
Top = 2280
Width = 615
End
Begin VB.CommandButton Sqrt
Caption = "sqrt"
Height = 495
Index = 16
Left = 4920
TabIndex = 22
Top = 1440
Width = 615
End
Begin VB.CommandButton Operator
Caption = "+"
Height = 495
Index = 15
Left = 3720
TabIndex = 21
Top = 3960
Width = 615
End
Begin VB.CommandButton Operator
Caption = "-"
Height = 495
Index = 14
Left = 3720
TabIndex = 20
Top = 3120
Width = 615
End
Begin VB.CommandButton Operator
Caption = "*"
Height = 495
Index = 13
Left = 3720
TabIndex = 19
Top = 2280
Width = 615
End
Begin VB.CommandButton Operator
Caption = "/"
Height = 495
Index = 12
Left = 3720
TabIndex = 18
Top = 1440
Width = 615
End
Begin VB.CommandButton Decimal
Caption = "."
Height = 495
Index = 11
Left = 2520
TabIndex = 17
Top = 3960
Width = 615
End
Begin VB.CommandButton sgn
Caption = "+/-"
Height = 495
Index = 10
Left = 1440
TabIndex = 16
Top = 3960
Width = 615
End
Begin VB.CommandButton Number
Caption = "0"
Height = 495
Index = 9
Left = 360
TabIndex = 15
Top = 3960
Width = 615
End
Begin VB.CommandButton Number
Caption = "3"
Height = 495
Index = 8
Left = 2520
TabIndex = 14
Top = 3120
Width = 615
End
Begin VB.CommandButton Number
Caption = "2"
Height = 495
Index = 7
Left = 1440
TabIndex = 13
Top = 3120
Width = 615
End
Begin VB.CommandButton Number
Caption = "1"
Height = 495
Index = 6
Left = 360
TabIndex = 12
Top = 3120
Width = 615
End
Begin VB.CommandButton Number
Caption = "6"
Height = 495
Index = 5
Left = 2520
TabIndex = 11
Top = 2280
Width = 615
End
Begin VB.CommandButton Number
Caption = "5"
Height = 495
Index = 4
Left = 1440
TabIndex = 10
Top = 2280
Width = 615
End
Begin VB.CommandButton Number
Caption = "4"
Height = 495
Index = 3
Left = 360
TabIndex = 9
Top = 2280
Width = 615
End
Begin VB.CommandButton Number
Caption = "9"
Height = 495
Index = 2
Left = 2520
TabIndex = 8
Top = 1440
Width = 615
End
Begin VB.CommandButton Number
Caption = "8"
Height = 495
Index = 1
Left = 1440
TabIndex = 7
Top = 1440
Width = 615
End
Begin VB.CommandButton Number
Caption = "7"
Height = 495
Index = 0
Left = 360
TabIndex = 6
Top = 1440
Width = 615
End
Begin VB.CommandButton cmdCancel
Caption = "C"
Height = 375
Left = 4680
TabIndex = 5
Top = 840
Width = 855
End
Begin VB.CommandButton cmdCE
Caption = "CE"
Height = 375
Left = 2520
TabIndex = 4
Top = 840
Width = 1335
End
Begin VB.CommandButton cmdBackspace
Caption = "Backspace"
Height = 375
Left = 360
TabIndex = 3
Top = 840
Width = 1695
End
Begin VB.TextBox Readout
Alignment = 1 'Right Justify
Height = 375
Left = 1440
TabIndex = 2
Text = "0."
Top = 240
Width = 4215
End
Begin VB.Label Label1
Caption = "输入框"
Height = 375
Left = 360
TabIndex = 1
Top = 360
Width = 1215
End
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim Op1, Op2
Dim DecimalFlag As Integer
Dim NumOps As Integer
Dim LastInput
Dim Opflag
Dim TempReadout
' 窗体的初始化过程
' 设置所有变量为其初始值
Private Sub Form_Load()
DecimalFlag = False
NumOps = 0
LastInput = "NONE"
Opflag = " "
Readout = Format(0, "0.")
End Sub
'Backspace(退格）按钮的click事件过程
Private Sub cmdBackspace_Click()
If Readout.Text = " " Then
Exit Sub
End If
If DecimalFlag = False Then
Readout.Text = Left(Readout.Text, Len(Readout.Text) - 2) + Format(0, ".")
Else
Readout.Text = Left(Readout.Text, Len(Readout.Text) - 1)
' DecimalFlag = False
End If
End Sub
' C (取消) 按钮的 Click 事件过程
' 重新设置显示并初始化变量。
Private Sub cmdCancel_Click()
Readout = Format(0, "0.")
Op1 = 0
Op2 = 0
Form_Load
End Sub
' CE (取消输入)按钮的 Click 事件过程
Private Sub cmdCE_Click()
Readout = Format(0, "0.")
DecimalFlag = False
LastInput = "CE"
End Sub
'计算倒数（1/x）按钮的click过程
Private Sub Countdown_Click(Index As Integer)
Readout = 1 / Readout
Opflag = "1/x"
NumOps = NumOps + 1
DecimalFlag = True
LastInput = "NUMS"
End Sub
' 小数点 (.) 按钮的 Click 事件过程
' 如果上一次按键为运算符，初始化 readout 为 "0."；
' 否则显示时追加一个小数点
Private Sub Decimal_Click(Index As Integer)
If LastInput = "NEG" Then
Readout = Format(0, "-0.")
ElseIf LastInput <> "NUMS" Then
Readout = Format(0, "0.")
End If
DecimalFlag = True
LastInput = "NUMS"
End Sub
' 数字键 (0-9) 的 Click 事件过程
' 向显示中的数追加新数
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(1, Readout, Format(0, "."), 1) - 1) + Number(Index).Caption + Format(0, ".")
' Readout.Text = Left(Readout.Text, Len(Readout.Text) - 1) + Number(Index).Caption + Format(0, ".")
End If
If LastInput = "NEG" Then
Readout = "-" & Readout
End If
LastInput = "NUMS"
End Sub
' 运算符 (+, -, x, /, =) 的 Click 事件过程
' 如果接下来的按键是数字键，增加 NumOps。
' 如果有一个操作数，则设置 Op1。
' 如果有两个操作数，则将 Op1 设置为 Op1 与
' 当前输入字符串的运算结果，并显示结果
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 "*"
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)
End Select
Readout = Op1
NumOps = 1
End Select
If LastInput <> "NEG" Then
LastInput = "OPS"
Opflag = Operator(Index).Caption
End If
End Sub
'计算被分数的（％）的click的过程
Private Sub Percent_Click(Index As Integer)
Readout = Readout / 100
LastInput = "NUMS"
Opflag = "%"
NumOps = NumOps + 1
DecimalFlag = True
End Sub
'计算平方根（sqrt)按钮的click过程
Private Sub Sqrt_Click(Index As Integer)
Readout = Sqr(Readout)
LastInput = "NUMS"
Opflag = "sqrt"
NumOps = NumOps + 1
DecimalFlag = True
End Sub
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