如何找到一个阶乘？ [英] How to find a factorial?

问题描述

我怎么能写一个程序找到任何数量的阶乘？

How can I write a program to find the factorial of any number?

推荐答案

这将为阶乘工作正整数（虽然非常小的子集）：

This will work for the factorial (although a very small subset) of positive integers:

unsigned long factorial(unsigned long f)
{
    if ( f == 0 ) 
        return 1;
    return(f * factorial(f - 1));
}

printf("%i", factorial(5));

由于您的问题（和水平已承认）的性质，该解决方案是基于更解决这个，而不是将在接下来的置换引擎中使用的函数的概念

Due to the nature of your problem (and level that you have admitted), this solution is based more in the concept of solving this rather than a function that will be used in the next "Permutation Engine".

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