Question

用vb语言编写一个简易计算器

要求
1．能够完成浮点数的加，减，乘，除；
2．能够实现退格和清除功能；
3．应用控件数组实现。

它包含三个控件数组，分别在设计时建立：
默认控件名 设置控件名 下标范围(index) Caption
运算符： Commond1 Operator 0-4 +-*/=
数字按钮： Commond2 Number 0-9 0123456789
数制转换按钮：Commond3 Tran 0-1 O H

Answer 1

Dim N1 As Single
Dim ysf As String
Dim qing As Boolean
Dim M As Single
Private Sub C_Click(Index As Integer)
If qing = True Then
L.Caption = ""
qing = False
End If
L.Caption = L.Caption & C(Index).Caption
End Sub

Private Sub Command1_Click()
qing = True
Dim N2 As Single
Dim T As Single
N2 = Val(L.Caption)
Select Case ysf
Case "+"
T = N1 + N2
Case "-"
T = N1 - N2
Case "*"
T = N1 * N2
Case "/"
T = N1 / N2
End Select
L.Caption = T

End Sub

Private Sub Command10_Click()
M = Val(L.Caption)
L1.Caption = "M"
End Sub

Private Sub Command11_Click()
M = M + Val(L.Caption)
End Sub

Private Sub Command2_Click()
L.Caption = -Val(L.Caption)
End Sub

Private Sub Command3_Click()
If L.Caption <> "" Then
L.Caption = Left(L.Caption, Len(L.Caption) - 1)
End If
End Sub

Private Sub Command4_Click()
N1 = 0
L.Caption = ""
ysf = "+"
End Sub

Private Sub Command5_Click()
L.Caption = ""
End Sub

Private Sub Command6_Click()
L.Caption = Sqr(Val(L.Caption))
qing = True
End Sub

Private Sub Command7_Click()
L.Caption = 1 / (Val(L.Caption))
End Sub

Private Sub Command8_Click()
M = 0
L1.Caption = ""
End Sub

Private Sub Command9_Click()
L.Caption = M
End Sub

Private Sub Form_Load()
ysf = "+"
End Sub

Private Sub s_Click(Index As Integer)
N1 = L.Caption
ysf = s(Index).Caption
qing = True
End Sub

Private Sub xsd_Click()
If qing = True Then
L.Caption = ""
qing = False
End If
If InStr(1, L.Caption, ".") = 0 Then
L.Caption = L.Caption & "."
End If
End Sub

Answer 2

http://hi.baidu.com/flyhoney860615/blog/item/e2859ed61231112f07088b39.html