using System;

​

namespace MyApplication

{

  public abstract class Animal

  {

    public abstract void animalSound();

       public void sleep()

    {

      Console.WriteLine("Zzz");

    }

  }

  // Derived class (inherit from Animal)

  public class Pig : Animal

  {

    public override void animalSound()

    {

      Console.WriteLine("The pig says: wee wee");

    }

  }

​

  public class Program

  {

    public static void Main(string[] args)

    {

      Pig myPig = new Pig(); 

      myPig.animalSound();

      myPig.sleep();

    }

  }

}