05年秋江苏计算机二级VB上机试题及答案

1．程序参考界面如图2所示，编程时不得增加或减少界面对象或改变对象的种类，窗体及界面元素大小适中，且均可见；

2．运行程序，在文本框1中输入测试数据，单击“运行”按纽，求出其所有因子及所有因子的倒数和，按图示格式输出到多行文本框2中（结果要进行约分）；

3．单击“清除”按纽，则将两个文本框清空，焦点置于文本框1上； 4．程序中必须包含一个求其正整数所有因子倒数之和的通用过程。

答：源程序：

Private Sub Command1_Click() Dim x As Long

x = Int(Trim(Text1.Text)) Text2.Text = x & \的所有因子为：\Call yzsum(x) End Sub

Private Sub yzsum(ByVal x As Long)

Dim a() As Integer, idx As Integer, fz As Long, s1 As Long, fm As Long, s2 As Long Dim i As Integer For i = 1 To x

If x Mod i = 0 Then idx = idx + 1

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ReDim Preserve a(idx) a(idx) = i

Text2 = Text2 & i & \ If fm = 0 Then fm = fm + i fz = 1 Else

s1 = gcd(fm, i) s2 = fm * i / s1

fz = fz * s2 / fm + s2 / i fm = s2 End If End If Next i

s1 = gcd(fm, fz) fz = fz / s1 fm = fm / s1 If fm = 1 Then

Text2 = Text2 & vbCrLf & \所求因子倒数之和为： \Else

Text2 = Text2 & vbCrLf & \所求因子倒数之和为： \End If End Sub

Private Function gcd(ByVal x As Long, ByVal y As Long) As Long Dim r As Long Do

r = x Mod y

x = y y = r

Loop Until (y = 0) gcd = x End Function

Private Sub Command2_Click() Text1.Text = \Text2.Text = \Text1.SetFocus End Sub

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