static void Main(string[] args) { TechnicsThings a = new TechnicsThings(120, "SONY"); Console.WriteLine("TechnicsThings a: "); a.PrintInformation(); Player b = new Player(); b.Price = 1000; b.Manufacturer = "Apple"; b.RecordingFormat = "*.WMA"; Console.WriteLine("Player b: "); b.PrintInformation(); VideoPlayer d = new VideoPlayer(1000, "Canon", "*.AVI", "CMOS"); Console.WriteLine("VideoPlayer d: "); d.PrintInformation(); Console.ReadKey(); }