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

C program to swap two numbers using reference arguments, Aim: To implement...

Aim: To implement a program to swap two numbers using reference arguments. Code: void swap(int *a, int *b) {             int temp;             temp=*a;

Explain syntax rules for writing constructor functions, Syntax rules for wr...

Syntax rules for writing constructor functions Its name must be similar as that of the class to which it belongs. It is declared with no return type (not even void). Ho

Evaluate the credit worthiness of a client, Write a C++ program that can be...

Write a C++ program that can be used to evaluate the credit worthiness of a client. The program reads the credit limit and the price and quantity of the item to be purchased by the

Pebble merchant, There is a pebble merchant. He sells the pebbles, that are...

There is a pebble merchant. He sells the pebbles, that are used for shining the floor. His main duty is to take the length of the room’s sides. But he sometimes mistakes doing that

C Program with android, Hello, I would like to know if you can help in C pr...

Hello, I would like to know if you can help in C programs that work on android.

Programming, write a program that can accept numbers and perform all the fo...

write a program that can accept numbers and perform all the four arithmetic operation

Prepare a mt4 ea to clone mt4 trades to a binary options, Prepare a MT4 EA ...

Prepare a MT4 EA to clone MT4 Trades to a Binary Options Platform Project Description: I want an EA that clones MT4 Trades to Globaltrader365, GT Options and if possible othe

Program to convert compass heading in degrees , Convert compass heading in ...

Convert compass heading in degrees (0-360 degrees)to compass bearing. A compass bearing consist of three items namely: a.The direction you face (North or South) b.An angle betwe

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