求VB中做计算器全代码?

在窗体上放置以下控件：
1、lblResult
Label控件
设置lblResult.Caption
=
0
2、btnNum(0)~btnNum(9)
按钮控件数组，下标对应齐数字（如：btnNum(0).Caption=0，依次类推）
3、添加btnAdd（加法）、btnSub（减法）、btnMul（乘法）、btnDiv（除法）、btnEnter（等于号）、btnReset（清除键）六个按钮。
在窗体代码中输入以下内容：
Dim
byteOperation
As
Byte
'操作符
Dim
byteTmp
As
Byte
'临时操作符
Dim
intNum
As
Double
'输入的数字
Sub
Calc()
Select
Case
byteOperation
Case
1
'Add
lblResult.Caption
=
CDbl(lblResult.Caption)
+
intNum
Case
2
'Sub
lblResult.Caption
=
intNum
-
CDbl(lblResult.Caption)
Case
3
'Mul
lblResult.Caption
=
CDbl(lblResult.Caption)
*
intNum
Case
4
'Div
lblResult.Caption
=
intNum
/
CDbl(lblResult.Caption)
Case
Else
End
Select
End
Sub
Private
Sub
btnNum_Click(Index
As
Integer)
If
byteTmp
<>
0
Then
intNum
=
lblResult.Caption
lblResult.Caption
=
0
byteTmp
=
0
End
If
If
lblResult.Caption
=
0
Then
lblResult.Caption
=
Index
Else
If
Len(lblResult.Caption)
<
9
Then
lblResult.Caption
=
lblResult.Caption
&
Index
End
If
End
If
End
Sub
Private
Sub
btnAdd_Click()
If
byteOperation
<>
0
Then
Call
Calc
End
If
byteOperation
=
1
byteTmp
=
1
End
Sub
Private
Sub
btnReset_Click()
byteTmp
=
0
byteOperation
=
0
intNum
=
0
lblResult.Caption
=
0
End
Sub
Private
Sub
btnSub_Click()
If
byteOperation
<>
0
Then
Call
Calc
End
If
byteOperation
=
2
byteTmp
=
2
End
Sub
Private
Sub
btnMul_Click()
If
byteOperation
<>
0
Then
Call
Calc
End
If
byteOperation
=
3
byteTmp
=
3
End
Sub
Private
Sub
btnDiv_Click()
If
byteOperation
<>
0
Then
Call
Calc
End
If
byteOperation
=
4
byteTmp
=
4
End
Sub
Private
Sub
btnEnter_Click()
Call
Calc
byteTmp
=
0
End
Sub