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

Encoding and decoding, program for decode the encoded numbering format into...

program for decode the encoded numbering format into message

Write short note on c++, Introduction to C++ C++ was developed by Bjarn...

Introduction to C++ C++ was developed by Bjarne Stroustrup at Bell Laboratories in 1983. Originally, it was known as " C with class". C+ as an enhancement to the C language was

Explain the rules for overloading an operator, Rules for overloading an ope...

Rules for overloading an operator This summarizes the most significant points you need to know in order to do operator function overloading. The only operators you may o

Boolean functions and simple logic design, The digital signal is one which ...

The digital signal is one which only consists of two states i.e. logic '1'   (+5 volts) and logic '0' (0 volts). Various electronic blocks use logic and these form the basis of a m

Padovan string, A Padovan string P(n) for a natural number n is defined as:...

A Padovan string P(n) for a natural number n is defined as: P(0) = ‘X’ P(1) = ‘Y’ P(2) = ‘Z’ P(n) = P(n-2) + P(n-3), n>2

Basic Programming Constructs, Write a program to print all the factors of a...

Write a program to print all the factors of a positive integer A

VS Project, Hi, I want to get rtsp source for windows

Hi, I want to get rtsp source for windows

C program, program for lexicographically precedes the given input permutati...

program for lexicographically precedes the given input permutation

Difference between method overloading and method overriding, Overloading a ...

Overloading a method (or function) in C++ is the ability for functions of the similar name to be defined as long as these methods have dissimilar signatures (different set of param

Program that calculates bowling scores, Homework – Chapter 5 – Bowling Scor...

Homework – Chapter 5 – Bowling Scores 33. Write a complete C++ program to do the following: The main program reads in and prints three bowling scores, score1, score2, and score

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