static void Main(string[] args)
{
////object initial
Program objP = new Program();
//array input
objP.take_input();
//array_list
Student objS = new Student();
///inheritence
objS.set_info();
objS.print_info();
///Polymorphism
Base objBase;
objBase = new Base();
objBase.Show();// Output ----> Show From Base Class.
objBase = new Derived();
objBase.Show();//Output--> Show From Derived Class.
objBase = new SecondDerived();
objBase.Show();//Output---> Show From Second Derived Class.
}