题目：利用递归方法求5!
1 # -*- coding:utf-8 -*-
2 n = input('请输入一个整数：')
3 def fib(n):
4 sum1 = 0
5 if n == 0:
6 sum1 = 1
7 else:
8 sum1 = n*fib(n-1)
9 return sum1
10
11 print '%d!=%d'%(n,fib(n)) 1 # -*- coding:utf-8 -*-
