Abstract_Animal.cs

public abstract class Abstract_Animal
    {
        public void Eat()
        {
            Console.WriteLine("Every animal eats food in order to survive");
        }

        public abstract void AnimalSound();
    }
    
    public class Lion:Abstract_Animal
    {

        public override void AnimalSound()
        {
            Console.WriteLine("Lion roars");
        }

        static void Main(string[] args)
        {
            Lion obj = new Lion();
            obj.AnimalSound();
            obj.Eat();
        }
    }