struct ThreeRealNums
{
    double n1;
    double n2;
    double n3;
};

ThreeRealNums CircLengthAreaVol(int R)
{
    // Length = 2 * pi * R
    // Area = pi * R^2
    // Volume of sphere = (4/3) * pi * R^3
    const double PI = 3.141592653589793;
    ThreeRealNums result;
    result.n1 = 2.0 * PI * R;                    // length
    result.n2 = PI * R * R;                      // area
    result.n3 = (4.0 / 3.0) * PI * R * R * R;    // volume
    return result;
}