阶乘的递归与迭代实现方法

• 递归:

# 阶乘-递归
def fact_iter(n):
    if n ==1:
        return 1
    else:
        return n * fact_iter(n-1)
n = int(input('输入一个数字: '))
result = fact_iter(n)
print('结果是: ',result)

• 迭代:

# 阶乘-迭代
def fact_recur(n):
    result = n
    for i in range(1,n):
        result *= i
    return result
n = int(input('输入一个数字: '))
result = fact_recur(n)
print('结果是: ',result)