Explain virtual functions, C/C++ Programming

Assignment Help:

Virtual Functions

The keyword virtual was previously used to resolve ambiguity for a class derived from two classes, both having a common ancestor. These classes are known as virtual base classes. This time it helps in implementing the idea of polymorphism with class inheritance. The function of the base class can be declared with the keyword virtual. The program with this change and its output is given below.

                class Shape

                 {

                  public :

virtual void print()

 {

                cout << " I am a Shape " << endl;

 }

                 };

                class Triangle : public Shape

                 {

                  public :

void print()

 {

                cout << " I am a Triangle " << endl;

 }

                 };

                class  Circle : public Shape

                 {

                  public :

void print()

 {

                cout << " I am a  Circle " << endl;

 }

                 };

 

void main()

 {

  Shape S;

  Triangle T;

  Circle C;

                S.print();

                T.print();

                C.print();

 

                  Shape *ptr;

 

                                ptr = &S;

                                ptr -> print();

 

                                ptr = &T;

                                ptr -> print();

 

ptr = &C;

                                ptr -> print();

}

 


Related Discussions:- Explain virtual functions

Array, If an array holds integer, each of which is four bytes long, how man...

If an array holds integer, each of which is four bytes long, how many bytes from the base location of the array is the location of the fifth element?

Creates and implements a class to represent the queue, Purpose This ass...

Purpose This assignment is an exercise in implementing the queue ADT using a singly-linked list. This assignment also introduces the concept of templates. Assignment Th

Computes the area of a circle of radius r, (a) Write a procedure called (ar...

(a) Write a procedure called (area-of-rectangle h w) that computes the area of a rectangle of height h and width w. (b) Write a procedure called (area-of-circle r) that computes

Explain object-oriented programming, Explain Object-oriented programming ...

Explain Object-oriented programming Object-oriented programming (OOP) attempts to meet these requirements, providing methods for managing enormous complexity, achieving reuse o

Common concepts of object oriented, Object Oriented Programming Paradigm: ...

Object Oriented Programming Paradigm: For OOP, Paradigm is a standard set.  The OOP will help to develop software in modules, which will be integrated later as a full packag

Flowcharting., flowcharting of 3 quizes display the average

flowcharting of 3 quizes display the average

Algorithm, write a pseudo code for computing sin(x) using sentinel control ...

write a pseudo code for computing sin(x) using sentinel control loop

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd