Explain pure virtual functions, C/C++ Programming

Assignment Help:

Pure Virtual Functions

An abstract class is one, which is used just for deriving some other classes. No object of this class is declared and used in the program. Likewise, there are pure virtual functions which themselves won't be used. Consider the above example with some changes.

class Shape

                 {

                  public :

virtual void print() = 0; // Pure virtual

                             function

                 };

                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;

 

                  Shape *ptr;

 

                                ptr = &T;

                                ptr -> print();

 

ptr = &C;

                                ptr -> print();

                }

 


Related Discussions:- Explain pure virtual functions

Describe difference between malloc()/free() & new/delete?, for object, mall...

for object, malloc allocates memory in heap however doesn't invoke object's constructor to initialize the object. new allocates memory & also invokes constructor to initialize the

Write a program that calculates circumference and area, Write a program cal...

Write a program called A1Q3, that reads it the radius of a circle as an integer and prints the circle's diameter, circumference and area.  Use a constant value for pi.  Do all calc

Luminous jewels polishing game, Luminous Jewels - The Polishing Game Bytel...

Luminous Jewels - The Polishing Game Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various lum

Define difference among new & malloc?, Both malloc & new functions are util...

Both malloc & new functions are utilized for dynamic memory allocations & the basic difference is: malloc need a special "typecasting" while it allocates memory for eg. if the poin

Program that print the number of hops, You are working for a computer gamin...

You are working for a computer gaming company and have been asked to look at a survival game.  You will be simulating a rabbit stranded on an island, collecting a large number of s

C language, WHAT IS A C LANGUAGE? C IS A PROGRAMMING?

WHAT IS A C LANGUAGE? C IS A PROGRAMMING?

C , why c is middle level language?

why c is middle level language?

ASCII, A string S is said to be "Super ASCII", if it contains the character...

A string S is said to be "Super ASCII", if it contains the character frequency equal to their ascii values. String will contain only lower case alphabets (''a''-''z'') and the asci

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

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

Need android app development, Project Description: I am seeking a develo...

Project Description: I am seeking a developer who can start an app from scratch and get it delivered to me as soon as possible. It is a little android based app. A background on

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