static void Main(string[] args) { var falcon9 = new Rocket("Falcon 9", 7500); var astronauts = new List <Astronaut>() { new Astronaut(75, "Mae"), new Astronaut(81, "Sally"), new Astronaut(99, "Charles") }; foreach (var astronaut in astronauts) { var status = ""; if (falcon9.AddAstronaut(astronaut)) { status = "On board"; } else { status = "Not on board"; } Console.WriteLine($"{astronaut.Name}: {status}"); } var cargo = new List <Cargo>() { new Cargo(3107.39, "Satellite"), new Cargo(1000.39, "Space Probe"), new Cargo(753, "Water"), new Cargo(541, "Food"), new Cargo(2107.39, "Tesla Roadster"), }; foreach (var c in cargo) { var loaded = ""; if (falcon9.AddCargo(c)) { loaded = "Loaded"; } else { loaded = "Not loaded"; } Console.WriteLine($"{c.Material}: {loaded}"); } Console.WriteLine($"Final cargo and astronaut mass: {falcon9.CurrentMassKg()} kg."); }