ACM 10649 - Danger Point

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

int main()
{
    double r ,a ,n, s, k, i, j;
    while (scanf("%lf %lf", &r, &a) == 2)
    {
        if (r == 0 && a == 0) break;
        r = r / 2;
        n = 2 * r * r - a * a;
        if (n >= 0) 
        {
            k = 2 * (r * r + a * sqrt(n));
            if (k >= 0)
               s = sqrt(k) - a,  printf("%.6lf\n", s);
            else printf("INCORRECT INFORMATION !!!\n"); 
        }
        else printf("INCORRECT INFORMATION !!!\n");
    }
    return 0;
}

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