// sum of volume and mass of spheres
#include <iostream>
#include <math.h>
using namespace std;

// function declaration (implementation in sphere.cpp)
double mass(double r, double rho);
double volume(double r);

// main function

const double r1=1.; // radius of first sphere
const double r2=3.; // radius of second sphere
const double rho=7.87; // density

int main()  
{
  double volume_sum = volume(r1) + volume(r2);
  cout << volume_sum << endl; // sum of volume

  double mass_sum = mass(r1, rho) + mass(r2, rho);
  cout << mass_sum << endl;  // sum of mass
}