C++ LANGUAGE CLASS

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C++ LANGUAGE CLASS

CLASS 

The main purpose of C++ programming is to add object orientation 
to the C programming language and classes are the central feature 
of C++ that supports object-oriented programming and are often 
called user-defined types. 

A class is used to specify the form of an object and it combines 
data representation and methods for manipulating that data into 
one neat package. The data and functions within a class are 
called members of the class. 

C++ Class Definitions 

When you define a class, you define a blueprint for a data 
type. This doesn't actually define any data, but it does 
define what the class name means, that is, what an object 
of the class will consist of and what operations can be 
performed on such an object. 

A class definition starts with the keyword class followed by 
the class name; and the class body, enclosed by a pair of 
curly braces. A class definition must be followed either by 
a semicolon or a list of declarations. For example, we define 
the Box data type using the keyword class as follows: 

class Box 
{ 
   public: 
      double length;   // Length of a box 
      double breadth;  // Breadth of a box 
      double height;   // Height of a box 
}; 

The keyword public determines the access attributes of the 
members of the class that follows it. A public member can 
be accessed from outside the class anywhere within the scope 
of the class object. You can also specify the members of 
a class as private or protected which we will discuss in a sub-section.