using System;

public class Animal

{

    public Animal()

    {

        Console.WriteLine("Animal constructor");

    }

    public void Greet()

    {

        Console.WriteLine("Animal says Hello");

    }

    public void Talk()

    {

        Console.WriteLine("Animal talk");

    }

    public virtual void Sing()

    {

        Console.WriteLine("Animal song");

    }

}

​

public class Dog : Animal

{

    public Dog()

    {

        Console.WriteLine("Dog constructor");

    }

    public new void Talk()

    {

        Console.WriteLine("Dog talk");

    }

    public override void Sing()

    {

        Console.WriteLine("Dog song");

    }

};

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World inheritance ");

        Animal an = new Animal();

        Dog dog = new Dog(); // je krijgt 2 displays : parent and child

        dog.Sing();

        dog.Talk();

        an.Sing();

        an.Talk();

        Console.WriteLine();

        Animal obj = new Dog();

        obj.Greet();

        obj.Talk();

        obj.Sing();

    }

}