1655.cpp

这是哈尔滨工业大学acmOJ的源代码

/*  This Code is Submitted by wywcgs for Problem 1655 on 2005-03-20 at 18:14:22 */ 
#include <stdio.h>
#include <math.h>
#define  PI  3.1415926536

int main()
{
    double R, r, temp;
    int i, n, test;
    
    scanf("%d", &test);
    for(i = 1; i <= test; i++){
        scanf("%lf %d", &R, &n);
        temp = sin(PI/(double)n);
        r = R * temp / (temp + 1);
        printf("Scenario #%d:\n", i);
        printf("%.3lf\n\n", r);
    }
    
    return 0;
}