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

Write a program to find the area under the curve y =, Write a program to fi...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b.   #include float start_poin

Program to create local shopping cart, Available, and the right kind of pro...

Available, and the right kind of programs. My son wants to stop using ice. He has organised detox a number of times, and is always successful. It is the next stage, rehab, where

Palindrome, A palindrome is a string that reads the same from both the ends...

A 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 palindrome

How can we simulate the concept of multiple inheritance, Problem: (a) U...

Problem: (a) Using a class hierarchy of your own choosing, with at least TWO subclass levels, show (i) the use of abstract and concrete forms of Java class and method in you

Explain function templates, Function Templates Function templates give ...

Function Templates Function templates give you with the capability to write a one function that is a skeleton, or template, for a family of similar functions. In function ov

Demo assignment, Please send me demo assignment,I want work

Please send me demo assignment,I want work

Programing solution, write a program that declares and initializes 2 intege...

write a program that declares and initializes 2 integer variable a and b with the value 35 and 14, and displays and calculates their sum,product,quotient and real division result.t

Virtual constructor, Is it possible to have Virtual Constructor? If yes, ho...

Is it possible to have Virtual Constructor? If yes, how? If not, Why not possible?

Pebble merchant, 3 kilograms of peebles are needed for converting an area o...

3 kilograms of peebles are needed for converting an area of 1 square meter.the rate of the peeble is 5 per kilogram

Parking garage, A parking garage charges a $2.00 minimum fee to park for up...

A parking garage charges a $2.00 minimum fee to park for up to three hours and an additional $0.50 per hour for each hour or part thereof over three hours. The maximum charge for a

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