1847064_ce.c

北大大牛代码 1240道题的原代码 超级权威

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

void main()
{
        int n, i, t;
        double r;
         scanf("%d",&t);
        for(i = 0; i < t;i++)
        {
           scanf("%lf%d",&r,&n);
           printf("Scenario #%d:\n%.3f\n\n",i+1,r*sin(acos(-1)/n)/(1+sin(acos(-1)/n)));
        }
 }