static void Main(string[] args)
{
/* ----------------Part-1-------------------
*/
//usage of classes
Box Box1 = new Box(5.0, 6.0, 7.0);
double volume = 0.0;
volume = Box1.getVolume();//volume
Console.WriteLine("Volume of Box1 : {0}", volume);
Box1.count();
Box1.count();
Box1.count();
Console.WriteLine("Variable num: {0}", Box.getNum());
//static class usage
Author.details();
Console.WriteLine("Author name : {0} ", Author.A_name);
Console.WriteLine("Book Name : {0} ", Author.B_name);
Console.WriteLine("ID : {0} ", Author.id);
//sealed class usage
SealedClass slc = new SealedClass();
int total = slc.Add(6, 4);
Console.WriteLine("Total = " + total.ToString());
//sealed method usage
Printer p = new Printer();
p.show();
p.print();
Printer ls = new LaserJet();
ls.show();
ls.print();
Printer of = new Officejet();
of.show();
of.print();
//abstract class usage
Square s = new Square(6);
Console.WriteLine("Area = " + s.Area());
Console.ReadKey();
}