Principles of Oop

1)OOP is programming language model 

  organized around objects rather than 

  action.

2)Historically, a program has been viewed 

   as a logical procedure that takes input 

   data, processes it and produces output 

   data. 

1.class

> The building block of C++ that leads to Object-Oriented programming is a Class. 

>A Class is a user-defined data-type which has data members and member functions, which can be accessed and used by creating an instance of that class. A class is like a blueprint for an object.

>Data members are the data variables and member functions are the functions used to manipulate these variables and together these data members and member functions define the properties and behavior of the objects in a Class.

> For Example: Consider the Class of Cars. There may be many cars with different names and brand but all of them will share 

some common properties like all of them will have 4 wheels, Speed Limit, Mileage range etc. So here, Car is the class and 

wheels, speed limits, mileage are their properties.

> In the above example of class Car, the data member will be speed limit, mileage etc. 

and member functions can apply brakes, increase speed etc.

> We can say that a Class in C++ is a blue-print representing a group of objects which shares 

some common properties and behaviors.