改錯(cuò)題：
Option Explicit
Private Sub Command1_Click()
Dim N As Integer, K As Long, St As String
For N = 500 To 800
K = N ^ 2
If Validate(N) And Validate(K) Then
St = N & "^2=" & K
List1.AddItem St
End If
Next N
End Sub
Private Function Validate(ByVal N As Long) As Boolean '錯(cuò)誤點(diǎn)1byval
Dim P As String, i As Integer, a() As Integer, j As Integer
P = CStr(N) '錯(cuò)誤點(diǎn)2str(n)
ReDim a(Len(P))
For i = 1 To Len(P)
a(i) = Mid(P, i, 1)
Next i
For i = 1 To UBound(a) - 1
For j = i + 1 To UBound(a)
If a(i) = a(j) Then Exit Function '錯(cuò)誤點(diǎn)3Exit For
Next
Next
Validate = True
End Function
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