( )21. 執行下列 Visual Basic 程式片段，輸出結果為何?
(A) 8
(B) 13
(C) 6
(D) 9

```vba
Sub Main()
Console.WriteLine(F(S))
End Sub
Function F(ByVal n) As Integer
Dim a1, a2, a3, i As Integer
a1 = 0 : a2 = 1
If n = 0 Or n = 1 Then
Return n
End If
For i = 2 To n
a3 = a1 + a2
a1 = a2
a2 = a3
Next
Return a3
End Function
```

答案：登入後查看
統計： 尚無統計資料