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

For loop, minimum of seven number

minimum of seven number

Solution, Damjibhai and Shamjibhai are two jeweler friends. They decide to ...

Damjibhai and Shamjibhai are two jeweler friends. They decide to play a simple game. The game comprises of removing the jewels for polishing, turn by turn. Once a jewel is removed

Calculation, write a program to calculate the cuboid

write a program to calculate the cuboid

#title. RETIRED ON SOCIAL SECURITY., IS IT POSSIBLE FOR YOU TO WRITE A PR...

IS IT POSSIBLE FOR YOU TO WRITE A PROGRAM FOR ME TO MEASURE EXISTING ANGLES AND DO IF AND THEN FROM THIS , AND TO PLACE FIXED ANGLES AT CERTAIN POSITION AS A ADD WITH DLL FOR CERTA

Function declarations and function definitions in cpp, FUNCTIONS It refe...

FUNCTIONS It refers to a subprogram that is meant to do a certain task. It is basically used to execute a set of operations and return information to the main or calling functio

Project, Project Overview A certain financial institution (bank) wishes to ...

Project Overview A certain financial institution (bank) wishes to promote its new business products/services by conducting road shows in rural areas. Their aim is to encourage peop

Area under curve, write a program to find the area under the curve y=f(x) b...

write a program to find the area under the curve y=f(x) between x=a and x=b integrate y=f(x)   #include float start_point, /* GLOBAL VARIABLES */

Area, find area uder the curve y=f(x) between x=a and x=b   #incl...

find area uder the curve y=f(x) between x=a and x=b   #include float start_point, /* GLOBAL VARIABLES */ end_point, total_area; in

D, drawbacks in assignments in engeenirng

drawbacks in assignments in engeenirng

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