Question

输入m，k的值，编程求下面表达式的值：（要求编写一个求阶乘的函数，调用函数实现本题）p=k!/(m-k)!

#include <stdio.h>
unsigned long Factorial(unsigned int number);
main()
{ unsigned int m, k;
double p;
printf("Please input m, k:");
scanf("%u, %u", &m, &k);
p = (double)Factorial(k) / Factorial (m-k);
printf("p=%f\n", p);
}
unsigned long Factorial(unsigned int number)
{

}

Answer 1

要了解一下递归的思想以及相关算法哦
用递归实现：
unsigned long Factorial(unsigned int number)
{
if (number == 0) return 1;
return number * Factorial(number-1);
}
当然，用循环块也可以

Answer 2

unsigned long Factorial(unsigned int number)
{
unsigned long result=1;
for(unsigned long i=1;i<=number;i++)
{
result*=i;
}
return result;
}