单项选择题

设有如下程序：
Private Static Function Fac(n As Integer)As Integer
Dim f As Integer
f=f+n
Fac=f
End Function
Private Sub Form_Click( )
Dim I As Integer
For 1=2 To 3
Print"#"；I&“=”&Fac(1)
Next I
End Sub
程序运行后，单击窗体，在窗体上显示的是