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

Arrays and pointers, i have an array of structs, and am trying to make a po...

i have an array of structs, and am trying to make a pointer that can point to a certain struct within the array

Need squid web proxy with ffmpeg to convert flv to h.264, Need Squid Web Pr...

Need Squid Web Proxy with ffmpeg to convert flv to h.264 Project Description: We need a squid proxy setup with the modification that will transcode FLV to h.264 in real-time,

Jewel polishing, Byteland county is very famous for luminous jewels. Lumino...

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

We want network-social app, We are seeking a talented developer/team with g...

We are seeking a talented developer/team with great experience in programming apps for both Android and iOS. Our project needs great skills and experience in making good functional

Luminous jewels, Problem : Luminous Jewels - Polishing Necklace Byteland c...

Problem : Luminous Jewels - Polishing Necklace Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of v

Object Oriented Programming , You are required to give C++ implementation o...

You are required to give C++ implementation of following classes: 1. PropertyCategories 2. Plot 3. Flat 4. House Following is the description of all data member and member funct

Sentinel controlled loop, develop an algorithm using pseudocode for computi...

develop an algorithm using pseudocode for computing cos(x) and sin(x). use a sentinel controlled while loop. use the series definition of e^+-jx

Word counting, Task Your task is to write a program, words, that reports i...

Task Your task is to write a program, words, that reports information about the number of words read from its standard input. For example, if the file qbf.txtcontains the text th

Program for implement vectors and iterators, - Write a program using vector...

- Write a program using vectors and iterators that allows a user to maintain a personal list of DVD titles. The user should be able to view all DVD titles in his library, add and d

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