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

Programming Exercise 3, I have an exercise with 2 problems. One that is par...

I have an exercise with 2 problems. One that is partially completed except with read problems with memory overwrite, and the other problem. I have enclosed the instructions documen

Project, Project Overview A certain financial institution (bank) wishes to ...

Project Overview A certain financial institution (bank) wishes to promote its new business products/services by conducting road shows in rural areas. Their aim is to encourage peop

Hotel reservation, •Flow Chart and Pseudocode of Add module - Hotel booking...

•Flow Chart and Pseudocode of Add module - Hotel booking - Signup for new membership Delete module - Hotel reservation cancellation - Change of reservation

What is scope resolution operator, Scope Resolution operator: The scope...

Scope Resolution operator: The scope resolution operator: : is used to access global variable in the inner block. When global and local variable are identical name the scope re

Example of switch case statement, #include #include #include void* m...

#include #include #include void* memorycopy (void *des, const void *src, size_t count) {   size_t n = (count + 7) / 8;   char* destination = (char *) des;   char* source =

How do you know that your class requires virtual destructor, How do you kn...

How do you know that your class requires a virtual destructor? A: If at least your class has one virtual function, you must make a destructor for this class virtual. It will let

Cipher: Decrypt and Encrypt, You must write a program that can both decrypt...

You must write a program that can both decrypt and encrypt a single word that is entered by the user. The initial choice of encryption and decryption is left up to the user. Addi

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