1. (2016·杭州模拟) 自定义函数f的功能是计算自然数n的阶乘值，即f=n！。下面VB程序通过调用函数来计算S=1!+2!+3!+4!+5!+6!:

Function f(n as integer) as long

    Dim j As Integer

    f=1

    For j=1 to n

   f=f*j

    Next j

End Function

 Private Sub Command1_Click()

  Dim s As Long, AS Integer

  S=0

  For i=1 to 6

  Next i

  Text1.text=str(s)

 End Sub

方框中正确的语句是  （   ）