using System;

class Animal  // Base class (parent) 

{

  public virtual void animalSound() 

  {

    Console.WriteLine("The animal makes a sound");

  }

}

​

class Pig : Animal  // Derived class (child) 

{

  public override void animalSound() 

  {

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

  }

}

​

class Dog : Animal  // Derived class (child) 

{

  public override void animalSound() 

  {

    Console.WriteLine("The dog says: bow wow");

  }

}

​

class Program 

{

  public static void Main(string[] args) 

  {

    Animal myAnimal = new Animal();  // Create a Animal object

    Animal myPig = new Pig();  // Create a Pig object

    Animal myDog = new Dog();  // Create a Dog object

​

    myAnimal.animalSound();

    myPig.animalSound();

    myDog.animalSound();

  }

}