设计一个简单地计算器，可以进行加减乘除的运算 谢谢，如果正确了还可以追加分哦！
将以下文本复制到记事本中，储存为frmMain.frm再用VB打开
VERSION 5.00
Begin VB.Form frmMain
Appearance = 0 'Flat
BackColor = &H80000005&
BorderStyle = 3 'Fixed Dialog
Caption = "简单计算器"
ClientHeight = 2430
ClientLeft = 45
ClientTop = 435
ClientWidth = 3150
KeyPreview = -1 'True
LinkTopic = "Form1"
MaxButton = 0 'False
MinButton = 0 'False
ScaleHeight = 2430
ScaleWidth = 3150
ShowInTaskbar = 0 'False
StartUpPosition = 3 '窗口缺省
Begin VB.CommandButton Command10
Caption = "^"
Height = 375
Left = 1920
TabIndex = 22
Top = 1920
Width = 495
End
Begin VB.PictureBox picDisplay
Appearance = 0 'Flat
BackColor = &H80000005&
ForeColor = &H80000008&
Height = 255
Left = 120
ScaleHeight = 225
ScaleWidth = 2865
TabIndex = 19
Top = 120
Width = 2895
Begin VB.TextBox Text1
Alignment = 1 'Right Justify
BorderStyle = 0 'None
Height = 255
Left = 240
Locked = -1 'True
TabIndex = 20
Top = 0
Width = 2535
End
Begin VB.Label lblOperation
Appearance = 0 'Flat
BackColor = &H80000005&
ForeColor = &H80000008&
Height = 255
Left = 60
TabIndex = 21
Top = 0
Width = 255
End
End
Begin VB.CommandButton Command9
Caption = "退格"
Height = 375
Left = 1920
TabIndex = 18
Top = 480
Width = 495
End
Begin VB.CommandButton Command8
Caption = "清零"
Height = 375
Left = 2520
TabIndex = 17
Top = 480
Width = 495
End
Begin VB.CommandButton cmdDot
Caption = "."
Height = 375
Left = 120
TabIndex = 16
Top = 1920
Width = 495
End
Begin VB.CommandButton Command7
Caption = "Sqrt"
Height = 375
Left = 2520
TabIndex = 15
Top = 1920
Width = 495
End
Begin VB.CommandButton Command6
Caption = "="
Height = 375
Left = 1320
TabIndex = 14
Top = 1920
Width = 495
End
Begin VB.CommandButton Command5
Caption = "/"
Height = 375
Left = 2520
TabIndex = 13
Top = 1440
Width = 495
End
Begin VB.CommandButton Command4
Caption = "*"
Height = 375
Left = 1920
TabIndex = 12
Top = 1440
Width = 495
End
Begin VB.CommandButton Command3
Caption = "-"
Height = 375
Left = 2520
TabIndex = 11
Top = 960
Width = 495
End
Begin VB.CommandButton Command2
Caption = "+"
Height = 375
Left = 1920
TabIndex = 10
Top = 960
Width = 495
End
Begin VB.CommandButton Command1
Caption = "9"
Height = 375
Index = 9
Left = 1320
TabIndex = 9
Top = 480
Width = 495
End
Begin VB.CommandButton Command1
Caption = "8"
Height = 375
Index = 8
Left = 720
TabIndex = 8
Top = 480
Width = 495
End
Begin VB.CommandButton Command1
Caption = "7"
Height = 375
Index = 7
Left = 120
TabIndex = 7
Top = 480
Width = 495
End
Begin VB.CommandButton Command1
Caption = "6"
Height = 375
Index = 6
Left = 1320
TabIndex = 6
Top = 960
Width = 495
End
Begin VB.CommandButton Command1
Caption = "5"
Height = 375
Index = 5
Left = 720
TabIndex = 5
Top = 960
Width = 495
End
Begin VB.CommandButton Command1
Caption = "4"
Height = 375
Index = 4
Left = 120
TabIndex = 4
Top = 960
Width = 495
End
Begin VB.CommandButton Command1
Caption = "3"
Height = 375
Index = 3
Left = 1320
TabIndex = 3
Top = 1440
Width = 495
End
Begin VB.CommandButton Command1
Caption = "2"
Height = 375
Index = 2
Left = 720
TabIndex = 2
Top = 1440
Width = 495
End
Begin VB.CommandButton Command1
Caption = "1"
Height = 375
Index = 1
Left = 120
TabIndex = 1
Top = 1440
Width = 495
End
Begin VB.CommandButton Command1
Caption = "0"
Height = 375
Index = 0
Left = 720
TabIndex = 0
Top = 1920
Width = 495
End
End
Attribute VB_Name = "frmmain"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Data As Double
Private lOperation As Long
Private fClear As Boolean
Private Sub cmdDot_Click()
If InStr(1, Text1.Text, ".") <= 0 Then Text1.Text = Text1.Text & "."
End Sub
Private Sub Command1_Click(Index As Integer)
If fClear = True Then Text1.Text = "": fClear = False
Text1.Text = Text1.Text & Index
End Sub
Private Sub Command10_Click()
If fClear = False Then
Select Case lOperation
Case 0
Case 1: Text1.Text = Data + Val(Text1.Text)
Case 2: Text1.Text = Data - Val(Text1.Text)
Case 3: Text1.Text = Data * Val(Text1.Text)
Case 4: If Val(Text1.Text) = 0 Then MsgBox "除数不等于0": Exit Sub Else Text1.Text = Data / Val(Text1.Text)
Case 5: Text1.Text = Data ^ Val(Text1.Text)
End Select
End If
Data = Val(Text1.Text)
fClear = True
lOperation = 5
lblOperation.Caption = "^"
End Sub
Private Sub Command2_Click()
If fClear = False Then
Select Case lOperation
Case 0
Case 1: Text1.Text = Data + Val(Text1.Text)
Case 2: Text1.Text = Data - Val(Text1.Text)
Case 3: Text1.Text = Data * Val(Text1.Text)
Case 4: If Val(Text1.Text) = 0 Then MsgBox "除数不等于0": Exit Sub Else Text1.Text = Data / Val(Text1.Text)
Case 5: Text1.Text = Data ^ Val(Text1.Text)
End Select
End If
Data = Val(Text1.Text)
fClear = True
lOperation = 1
lblOperation.Caption = "+"
End Sub
Private Sub Command3_Click()
If fClear = False Then
Select Case lOperation
Case 0
Case 1: Text1.Text = Data + Val(Text1.Text)
Case 2: Text1.Text = Data - Val(Text1.Text)
Case 3: Text1.Text = Data * Val(Text1.Text)
Case 4: If Val(Text1.Text) = 0 Then MsgBox "除数不等于0": Exit Sub Else Text1.Text = Data / Val(Text1.Text)
Case 5: Text1.Text = Data ^ Val(Text1.Text)
End Select
End If
Data = Val(Text1.Text)
fClear = True
lOperation = 2
lblOperation.Caption = "-"
End Sub
Private Sub Command4_Click()
If fClear = False Then
Select Case lOperation
Case 0
Case 1: Text1.Text = Data + Val(Text1.Text)
Case 2: Text1.Text = Data - Val(Text1.Text)
Case 3: Text1.Text = Data * Val(Text1.Text)
Case 4: If Val(Text1.Text) = 0 Then MsgBox "除数不等于0": Exit Sub Else Text1.Text = Data / Val(Text1.Text)
Case 5: Text1.Text = Data ^ Val(Text1.Text)
End Select
End If
Data = Val(Text1.Text)
fClear = True
lOperation = 3
lblOperation.Caption = "*"
End Sub
Private Sub Command5_Click()
If fClear = False Then
Select Case lOperation
Case 0
Case 1: Text1.Text = Data + Val(Text1.Text)
Case 2: Text1.Text = Data - Val(Text1.Text)
Case 3: Text1.Text = Data * Val(Text1.Text)
Case 4: If Val(Text1.Text) = 0 Then MsgBox "除数不等于0": Exit Sub Else Text1.Text = Data / Val(Text1.Text)
Case 5: Text1.Text = Data ^ Val(Text1.Text)
End Select
End If
Data = Val(Text1.Text)
fClear = True
lOperation = 4
lblOperation.Caption = "/"
End Sub
Private Sub Command6_Click()
If fClear = False Then
Select Case lOperation
Case 0
Case 1: Text1.Text = Data + Val(Text1.Text)
Case 2: Text1.Text = Data - Val(Text1.Text)
Case 3: Text1.Text = Data * Val(Text1.Text)
Case 4: If Val(Text1.Text) = 0 Then MsgBox "除数不等于0": Exit Sub Else Text1.Text = Data / Val(Text1.Text)
Case 5: Text1.Text = Data ^ Val(Text1.Text)
End Select
End If
Data = Val(Text1.Text)
fClear = True
lOperation = 0
lblOperation.Caption = ""
End Sub
Private Sub Command7_Click()
If Val(Text1.Text) <= 0 Then MsgBox "开方数大于等于0"
Text1.Text = Sqr(Val(Text1.Text))
Data = Val(Text1.Text)
fClear = True
lOperation = 0
lblOperation.Caption = ""
End Sub
Private Sub Command8_Click()
Text1.Text = ""
lOperation = 0
lblOperation.Caption = ""
End Sub
Private Sub Command9_Click()
If Len(Text1.Text) > 0 Then Text1.Text = Left(Text1.Text, Len(Text1.Text) - 1)
End Sub
Private Sub Form_KeyPress(KeyAscii As Integer)
Select Case KeyAscii
Case Asc("0"): Command1_Click 0
Case Asc("1"): Command1_Click 1
Case Asc("2"): Command1_Click 2
Case Asc("3"): Command1_Click 3
Case Asc("4"): Command1_Click 5
Case Asc("5"): Command1_Click 4
Case Asc("6"): Command1_Click 6
Case Asc("7"): Command1_Click 7
Case Asc("8"): Command1_Click 8
Case Asc("9"): Command1_Click 9
Case Asc("."): cmdDot_Click
Case Asc("+"): Command2_Click
Case Asc("-"): Command3_Click
Case Asc("*"): Command4_Click
Case Asc("/"): Command5_Click
Case Asc("^"): Command10_Click
Case Asc("s"): Command7_Click
Case Asc("S"): Command7_Click
Case vbKeyBack: Command9_Click
Case Asc("`"): Command8_Click
Case Asc("="): Command6_Click
Case 13: Command6_Click
End Select
KeyAscii = 0
End Sub
以下是图片：
VERSION 5.00
Begin VB.Form Form1
Caption = "计算机"
ClientHeight = 4230
ClientLeft = 60
ClientTop = 750
ClientWidth = 3165
LinkTopic = "Form1"
MaxButton = 0 'False
MinButton = 0 'False
ScaleHeight = 4230
ScaleWidth = 3165
StartUpPosition = 2 '屏幕中心
Begin VB.Frame Frame1
Height = 3495
Left = 120
TabIndex = 1
Top = 600
Width = 2895
Begin VB.CommandButton cmdResult
Caption = "="
BeginProperty Font
Name = "宋体"
Size = 12
Charset = 134
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 375
Left = 1080
TabIndex = 20
Top = 3000
Width = 1695
End
Begin VB.CommandButton cmdOff
Caption = "OFF"
Height = 375
Left = 1560
TabIndex = 19
Top = 240
Width = 495
End
Begin VB.CommandButton cmdCE
Caption = "CE"
Height = 375
Left = 2280
TabIndex = 18
Top = 240
Width = 495
End
Begin VB.CommandButton cmdchu
Caption = "/"
Height = 375
Left = 2280
TabIndex = 17
Top = 2520
Width = 495
End
Begin VB.CommandButton cmdjia
Caption = "+"
Height = 375
Left = 2280
TabIndex = 16
Top = 720
Width = 495
End
Begin VB.CommandButton cmd0
Caption = "0"
Height = 375
Left = 840
TabIndex = 15
Top = 2520
Width = 495
End
Begin VB.CommandButton cmd6
Caption = "6"
Height = 375
Left = 1560
TabIndex = 14
Top = 1320
Width = 495
End
Begin VB.CommandButton cmd8
Caption = "8"
Height = 375
Left = 840
TabIndex = 13
Top = 720
Width = 495
End
Begin VB.CommandButton cmd4
Caption = "4"
Height = 375
Left = 120
TabIndex = 12
Top = 1320
Width = 495
End
Begin VB.CommandButton cmd9
Caption = "9"
Height = 375
Left = 1560
TabIndex = 11
Top = 720
Width = 495
End
Begin VB.CommandButton cmd2
Caption = "2"
Height = 375
Left = 840
TabIndex = 10
Top = 1920
Width = 495
End
Begin VB.CommandButton cmdjian
Caption = "-"
Height = 375
Left = 2280
TabIndex = 9
Top = 1320
Width = 495
End
Begin VB.CommandButton cmdPoint
Caption = "."
BeginProperty Font
Name = "宋体"
Size = 12
Charset = 134
Weight = 400
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 375
Left = 1560
TabIndex = 8
Top = 2520
Width = 495
End
Begin VB.CommandButton cmdcheng
Caption = "*"
Height = 375
Left = 2280
TabIndex = 7
Top = 1920
Width = 495
End
Begin VB.CommandButton cmd5
Caption = "5"
Height = 375
Left = 840
TabIndex = 6
Top = 1320
Width = 495
End
Begin VB.CommandButton cmd3
Caption = "3"
Height = 375
Left = 1560
TabIndex = 5
Top = 1905
Width = 495
End
Begin VB.CommandButton cmd1
Caption = "1"
Height = 375
Left = 120
TabIndex = 4
Top = 1920
Width = 495
End
Begin VB.CommandButton cmd7
Caption = "7"
Height = 375
Left = 120
TabIndex = 3
Top = 720
Width = 495
End
Begin VB.CommandButton cmdChange
Caption = "+/-"
Height = 375
Left = 120
TabIndex = 2
Top = 2520
Width = 495
End
End
Begin VB.TextBox txt
Alignment = 1 'Right Justify
Enabled = 0 'False
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 = 120
Locked = -1 'True
TabIndex = 0
Top = 120
Width = 2895
End
Begin VB.Menu meuFile
Caption = "文件(&F)"
Begin VB.Menu meuExit
Caption = "退出(&X)"
Shortcut = ^X
End
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim XiaoShu As Boolean
'在窗体变量中声明一个布尔值来判断是否按下了小数点键，防止txt中出现多个小数。如果已经输入了小数点则Xiaoshu为True，否则为False
Dim FuHao As Byte
'声明一个Byte来记录我们按下了什么符号，1为"+"，2为"-"，3为"*"，4为"/"
Dim FirstNumber As Double
'声明一个变量来记录操作数的第一个数,如A+B，那么FirstNumber来记下A的值。
Dim DengHao As Boolean
'声明一个变量来记录是否按下了=号，如果按下了则为True
Private Sub cmd0_Click()
If txt.Text <> "" Then txt.Text = txt.Text + "0" '防止多个0在文本中出现
End Sub
Private Sub cmd1_Click() '按下1时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "1"
Else
txt.Text = "1" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd2_Click() '按下2时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "2"
Else
txt.Text = "2" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd3_click() '按下3时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "3"
Else
txt.Text = "3" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd4_Click() '按下4时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "4"
Else
txt.Text = "4" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd5_Click() '按下5时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "5"
Else
txt.Text = "5" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd6_Click() '按下6时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "6"
Else
txt.Text = "6" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd7_Click() '按下7时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "7"
Else
txt.Text = "7" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd8_Click() '按下8时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "8"
Else
txt.Text = "8" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmd9_Click() '按下9时
If Not DengHao Then '没按下等号
txt.Text = txt.Text + "9"
Else
txt.Text = "9" '按下了等号
DengHao = False
End If
End Sub
Private Sub cmdCE_Click()
txt.Text = ""
XiaoShu = False
End Sub
Private Sub cmdChange_Click()
If (Sgn(Val(txt.Text))) = 1 Then txt.Text = "-" + txt.Text: Exit Sub '用Sgn来判断txt文本框内的值的符号。大于0的话就在前面加上"-"
If (Sgn(Val(txt.Text))) = -1 Then txt.Text = Abs(Val(txt.Text)) 'txt文本框的文本为大于0的数txt前面的"-"去掉。
End Sub
Private Sub cmdcheng_Click()
FirstNumber = Val(txt.Text)
FuHao = 3
txt.Text = ""
XiaoShu = False
End Sub
Private Sub cmdchu_Click()
FirstNumber = Val(txt.Text)
FuHao = 4
txt.Text = ""
XiaoShu = False
End Sub
Private Sub cmdjia_Click()
FirstNumber = Val(txt.Text)
FuHao = 1
txt.Text = ""
XiaoShu = False
End Sub
Private Sub cmdjian_Click()
FirstNumber = Val(txt.Text)
FuHao = 2
txt.Text = ""
XiaoShu = False
End Sub
Private Sub cmdOff_Click()
End
End Sub
Private Sub cmdPoint_Click()
If txt.Text = "" Then txt.Text = "0"
If Not XiaoShu Then '当我们以前没有按下小数点键时在txt中加上小数点
txt.Text = txt.Text + "."
XiaoShu = True
End If
End Sub
Private Sub cmdResult_Click()
If FuHao = 1 Then '按下了+号
txt.Text = FirstNumber + Val(txt.Text)
End If
If FuHao = 2 Then '按下了-号
txt.Text = FirstNumber - Val(txt.Text)
End If
If FuHao = 3 Then '按下了*号
txt.Text = FirstNumber * Val(txt.Text)
End If
If FuHao = 4 Then '按下了、号
txt.Text = FirstNumber / Val(txt.Text)
End If
DengHao = True '记录下按了=号
XiaoShu = False
End Sub
Private Sub meuExit_Click()
End
End Sub本回答被提问者采纳
