Object-Oriented: Object-oriented systems are object-based, and also support inheritance between classes and superclasses and allow objects to send messages to themselves.

Object-based: Systems are object-based when they allow objects to encapsulate both the data and methods and when they enforce the object identity.

Object: An entity that can store data and, send and receive messages. An instance of a class.

Null Character: The character whose integer code is 0. The null character is used for terminating strings.

Null Pointer: A pointer that does not point to any data object. In C++, the null pointer can be represented by the constant 0.

Null: A constant of value 0 that points to nothing.

Normalization: The shifting of a floating-point fraction (and adjustment of the exponent) so there are no leading non significant digits in the fraction.

Non Significant Digits: Leading digits that do not affect the value of a number (0s for a positive number, 1s for a negative number in complement form).

New-line Character: A character that causes an output device to go to the beginning of a new line.

Multiple Inheritance: A language feature that allows a derived class to have more than one base class.

Method: The means by which an object receives and responds to a particular kind of message. In C++, a method is a member function.

Message Passing: The philosophy that objects only interact by sending messages to other. The messages request for some operations to be performed.

Message: Information sent to an object. A message generally produces an internal change in the object that receives it, and object may respond to the message by returning a reply. In C++ , we send messages by applying member functions to the class objects.

Member Pointer: A pointer that designates a member of a class. Member pointers are distinct from, and must not be confused with pointers that designate data objects.

Member Function: A function declared within a class and not declared as a friend. These functions can have access to the data members and define operations that can be performed on the data.