question_1.cs

class Animal
{
    public void Eat()
    {
        Console.WriteLine("Every animal eats something");
    }
    private virtual void DoSomething()
    {
        Console.WriteLine("Every animal does something");
    }
}

class Cat : Animal
{
    public override void DoSomething()
    {
        Console.WriteLine("Every animal does something in derived class ");
    }
    static void Main(string[] args)
    {
        Cat objCat = new Cat();
        objCat.Eat();
        objCat.DoSomething();
    }
}