HOJ 1951 Beavergnaw

http://acm.hit.edu.cn/hoj/problem/view?id=1951

給出樹幹的直徑和被松鼠啃去的體積 計算剩下樹幹的直徑

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

int main()
{
    const double pi = acos(-1);
    int d, v;//D, V
    double diameter, tmp;
    
    while (scanf("%d %d", &d, &v) != EOF)
    {
        if( d == 0 && v == 0 )
            break;
        tmp = (pow(d, 3) - 6 * v / pi);
        diameter = pow(tmp, 1.0/3);
        printf("%.3lf\n", diameter);
    }

    return 0;
}