'功能:以下程序段用于求∑n!
Private Sub Form_Click()
Dim sum As Integer, n As Integer
n = InputBox("请输入一个正整数")
sum = 0
For i = 1 To n
sum =sum+mul(i)
Next i
Print sum
End Sub
Private Function mul(ByVal x As Integer)
Dim s As Integer, i As Integer
s = 1
For i = 1 To x
s = s * i
Next i
mul=s
中的sum =sum+mul(i)是什么意思
总和?总差?
追问mul(i)表示的是什么意思啊