static void Main(string[] args)
        {
            Animal  animal  = new Animal();
            Dog     dog     = new Dog();
            Cat     cat     = new Cat();
            Chiuaua chiuaua = new Chiuaua();

            List <IAnimal> animals = new List <IAnimal>();

            animals.Add(animal);
            animals.Add(dog);
            animals.Add(cat);
            animals.Add(chiuaua);

            foreach (IAnimal species in animals)
            {
                species.MakeSound();
                species.SetName("Sellu");
                species.PrintInfo();

                species.Jump();
                species.Jump();
                species.Jump();
                species.Jump();
            }
        }
    public static void Main()
    {
        Dog MyDog = new Dog();

        MyDog = new GermanShepard();
        MyDog.Bark();     // prints Rrrrooouuff!!

        MyDog = new Chiuaua();
        MyDog.Bark();     // prints ruff;
    }