What are the object oriented programs in C++ ?

1    .     Polymorphism :- It allows a single name/operator  to be associated with different operations depending on the type of data passed to it. In C++ it is achieved by function overlapping, operator overlapping and dynamic binding.

Example :-  int sum (int a, int b) {return (a+b);}

                      float sum (float a, float b){ return (a+b);}

The observe two functions used to add two integers and two float. The function will be called depending on the arguments passed to it.

2   .     Inheritance :-   It allows the extension and reuse of existing code with out having to re- write the code. Inheritance involves the creation of new classes from an existing class. New classes are called derived class /new class/child class/ sub-class and existing class is called base class /old class/parent class/ super class. The derive class inherit the members of base class and also add its own.

Example:- class A

                              {

                                         Int x;

                                         Public:

                                          Void display()

                                                 {

                                                       Cout <<x;

                                                 }

                                    };

                              Class B : public A

                                                   {

                                                          Int y;

                                                           Public:

                                                            Void show()

                                                                    {

                                                                         C out <<y;

                                                                      }

                                                         };

3  .  Encapsulation :- It is amechanism that associates the code and the data. It manipulates into a single unit(class) and keeps then safe from external encapsulation is supported by a construct called class.

Example :- class student

                           {

                                       private:

                                       int role;

                                       char * name;

                                    public :

                                        void getdata ();

                                        void showdata ();

                           };

Data and methods are encapsulated in class.