1799.txt

北大ACM题目例程 详细的解答过程 程序实现 算法分析

Memory:40K  Time:31MS
Language:C++  Result:Accepted

Source 

#include <stdio.h>
#include <math.h>

int main()
{
	int n,cas,i;
	double R,r,sina;

	scanf("%d",&cas);
	for(i=1;i<=cas;i++)
	{
		scanf("%lf %d",&R,&n);
		sina = sin( 3.14159265359/n );
		r =( R * sina )
			/ ( 1 + sina );
		printf("Scenario #%d:\n", i );
		printf("%.3lf\n\n",r);
	}

	return 0;
}