fact(n) = n! = 1 * 2 * 3 * ... * (n-1) * n = (n-1)! * n = fact(n-1) * n最后返回值？？？？
fact(n) = n! = 1 * 2 * 3 * ... * (n-1) * n = (n-1)! * n = fact(n-1) * n
由此可知：fact(n)=fact(n-1)*n
? ? ?def fact(n):
... ? ? if n==1:
... ? ? ? ?return 1
... ? ? return fact(n)
return fact(n)為什么不正確？
2016-08-17
應該return n*fact(n-1), ?返回本身當然不對