求组合数代码

不见山谷

于 2021-03-03 19:19:15 发布

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本文链接：https://blog.youkuaiyun.com/run_Barry_run/article/details/111823372

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# include<stdio.h>

double fact(int);

int main(void)
{
	int m, n;
	int a, b, c;
	double result;
	scanf("%d%d",&m, &n);
	a = fact(n);
	b = fact(m);
	c = fact(n-m);
	result = a / (b*c);
	printf("result = %lf",result);
	
	return 0;
 } 
 
double fact(int i)
{
	double num = 1;
	for(i;i>0;i--)
	{ 
		num = num*i;
	}
	return num;
}