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

Algorithms, write an algorithm for multiplication of two sparse matrices us...

write an algorithm for multiplication of two sparse matrices using linked lists

C/c++, Byteland county is very famous for luminous jewels. Luminous jewels ...

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

Developing programs in the c++ programming language., I. COURSE DESCRIPTION...

I. COURSE DESCRIPTION Develops a working knowledge of object-oriented concepts in areas of classes, inheritance, data structures, error handling, templates and file processing.

String, palindrome is a string that reads the same from both the ends. Give...

palindrome is a string that reads the same from both the ends. Given a string S convert it to a palindrome by doing character replacement. Your task is to convert S to palindromes

Program to calculate pie, This problem familiarizes you with using random n...

This problem familiarizes you with using random numbers in C++. The program is to compute a good approximation of p using a simulation method called "Monte Carlo". The following fi

Operators, write a program to accept ten numbers and display the total

write a program to accept ten numbers and display the total

Pebble merchant, to design a car that travels along the room and gives the ...

to design a car that travels along the room and gives the length of the room

#CompilerRelated, #C Why don''t online compilers support the header file?...

#C Why don''t online compilers support the header file? What can I do to resolve this? PS. I have tried , does''nt work either. Thannk in advance.

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