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

Padovan string , write a program that counts the number of occurences of th...

write a program that counts the number of occurences of the string in the n-th Padovan string P(n) program in java // aakash , suraj , prem sasi kumar kamaraj college progr

Explain comments in c++, Comments Comments are integral part of every p...

Comments Comments are integral part of every program . Comments help in coding, debugging and maintaining a program . The compiler ignores them. They should be used liberally i

C program for dynamic data structure(linked list), Aim: To implement a pro...

Aim: To implement a program for dynamic data structure(linked list). Code:                       class node {             int data;             node *next;

First line starts with T, Byteland county is very famous for luminous jewe...

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

Stone Game - Remove Last, #include int main() { int T; ...

#include int main() { int T; int N; int i; scanf("%d",&T)

I need website product section search box coding section fix, I need websit...

I need website Product section search box coding section fix Project Description: On our products section in the search box it only searches the name and title of our product

Boardcoloring., Smugglers are becoming very smart day by day. Now they have...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

I need asp .net facebook app project completion, I need Asp .net Facebook a...

I need Asp .net Facebook app project completion Project Description: We are urgently seeking a few remaining items to be completed, and the project to be deployed to live.

Define some features of external storage class in c program, Define some fe...

Define some features of external storage class in c program? The features of an external storage class variable are as follows: Storage - memory Default initial value -

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