我需要一些功能方面的帮助 [英] I need a little bit of help with functions

问题描述

您好，我似乎无法理解这段代码，它是关于数字的因素，但我不明白该功能是如何工作的，如果有人可以帮忙，我会很高兴。



def因子（x）：

如果x == 0：

返回1

返回x *因子（x - 1）



x = int（输入（））

打印（因子（x））



我的尝试：



只是理解........... .................................................. .......

Hello, I can't seem to understand this code, it's about factor a number but I don't understand how works the function, I would be glad if someone can help with this.

def factor(x):
if x==0:
return 1
return x * factor(x - 1)

x=int(input())
print (factor(x))

What I have tried:

Just understanding....................................................................

推荐答案

此函数计算数字x的阶乘。

请参阅：https://en.wikipedia.org/wiki/Factorial [ ^ ]



函数调用自身：它是一个递归函数。

请参阅： https://www.programiz.com/python-programming/recursion [ ^ ]

This function calculates the factorial of the number x.
Please see: https://en.wikipedia.org/wiki/Factorial[^]

The function calls itself: it's a recursive function.
Please see: https://www.programiz.com/python-programming/recursion[^]

最终x的值达到0（由于x-1指令）并停止调用自身（因子0）定义为1）。

整个函数也在我的第一个答案的第二个链接中解释。您还可以将函数编写为：

Eventually the value of x reaches 0 (because of the x-1 instruction) and stops calling itself (the factorial of 0 is defined as 1).
The whole function is also explained in the second link in my first answer. You can also write the function as:

def factor(x):
    result = 1
    while x > 0: # x > 1 will do
       result = x * result
       x = x - 1
    return result

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