Classes. The word main is followed in the code by a pair of parentheses (()). class has operations member functions methods. It is the only way to implement User-de ned Data Type (UDT) class contains data members attributes. Made up of members. For that same reason, it is essential that all C++ programs have a main function. Variables Functions – called methods when part of a class Constructors: Initialize the class Destructors: Clean up as C++ provides many alternatives to avoid use of new Cla