void kepler_test(string planet, int y, int d)
{ print(planet);
  new_line();
  print("   When the year (Y) is ");
  print(y);
  print(" days long,");
  new_line();
  print("   and the distance to the sun (D) is ");
  print(d);
  print(" million miles,");
  new_line();
  const int six_y_sq = 6*y*y;
  const int d_cubed = d*d*d;
  print("   six times Y squared is ");
  print(six_y_sq);
  print(" and D cubed is ");
  print(d_cubed);
  new_line();
  print("  accuracy is ");
  const double error = six_y_sq * 100 / d_cubed;
  print(error);
  print(" --- ");
  // for Saturn, six_y_sq is bigger than d_cubed, so we get
  // a number > 100, making it look like more-than-perfect.
  // An if saves us.
  if (six_y_sq < d_cubed)
    print(six_y_sq * 100.0 / d_cubed);
  else
    print(d_cubed * 100.0 / six_y_sq);
  print(" percent");
  new_line();
  new_line(); }

void main()    
{ kepler_test("Venus", 223, 67);
  kepler_test("Earth", 365, 93);
  kepler_test("Mars", 686, 142);
  kepler_test("Jupiter", 4329, 484);
  kepler_test("Saturn", 10759, 870); }