Object-oriented programming principles A Lecture for the c++ Course Each slide has its own narration in an audio file. For the explanation of any slide, click on the audio icon to start the narration. The Professor‘s C++Course by Linda W. Friedman is licensed under a  Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Oop principles Inheritance, encapsulation, and polymorphism are the basic principles of object-oriented programming. OOP Principles

Inheritance Inheritance is the guiding principle for the relationship between classes. This is an explicit is-a relationship. Examples: Zebra is-a mammal Flower is-a plant Subclass  superclass The more specialized class inherits attributes and behaviors from the more generalized class. OOP Principles

Encapsulation  Encapsulation means that a class is cohesive and self-contained. The purpose of encapsulation is information hiding. If a class is designed well, its definition (implementation) can easily be hidden from other programmers who use the class in their programs; they only need to see the class interface in order to use the class. OOP Principles

Polymorphism  Polymorphism - poly (many) morph (form) - if two (or more) objects have the same interface (what the user of the class sees), but exhibit different behaviors, they are said to be polymorphic. Similar to function / operator overloading. OOP Principles

What vs. how Just like we learned when programming with functions, with classes we also distinguish between the interface and the implementation. Interface - the visible functionality of a class -- the "what" Implementation - the internal functionality and attributes of a class. A class's implementation is hidden from users of the class. -- the "how" OOP Principles

Review What did we learn in this lecture? Plenty. Some terms to jog your memory: base class polymorphism class class attributes class implementation class interface encapsulation information hiding inheritance object OOP Principles