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

C program to calculate area of cube, Aim: To implement program to calculat...

Aim: To implement program to calculate area of cube using inline function. Code: inline void area_cube(float side) {             float area;             are

Hwid spoofer for windows 7, Project Description: I want a simple program...

Project Description: I want a simple program that will spoof my hardware id. I should be able to prepare the id to spoof to in the program and press "random" button to spoof to

Program with various inputs-set associative cache , 1.1 A Few Notes: 1....

1.1 A Few Notes: 1. Please test your program with various inputs prior to submission. 2. All group members must understand the entire project for interactive grading. Equal

Simple object-oriented program, This assignment is to be undertaken individ...

This assignment is to be undertaken individually - no group work is permitted. Background information This assignment is an exercise in simple object-oriented programming and, acco

Why shouldn''t matrix class''s interface look like an array, Why shouldn't ...

Why shouldn't Matrix class's interface look like an array-of-array? A: Some people build a Matrix class that has an operator[] that returns a reference to an Array object (or po

Calculation, write a program to calculate the cuboid

write a program to calculate the cuboid

Explalin concept of derivations in c++, derivations 1. Regardless of the...

derivations 1. Regardless of the type of derivation, private members are inherited by the derived class, but cannot be accessed by the new member function of the derived class,

C++ project, project on business management

project on business management

Introduction to c, All languages are divided into six sections: - variables...

All languages are divided into six sections: - variables, I/O maths, conditional expressions, arrays, functions, subroutines and file handlers. Learning a software language is simi

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