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

String, Write a program that takes 3 small letters as input and sort them a...

Write a program that takes 3 small letters as input and sort them according to their ASCII value.

Is probable to encompass virtual constructor? if yes, Is it probable to enc...

Is it probable to encompass Virtual Constructor? If yes, how? If not, Why?

Type compatibility, Define  T y pe c o m p a t i b i li t y? ...

Define  T y pe c o m p a t i b i li t y? T o a s s i g n i n t t o s m a l l i n t t h e v a r i a b l e should b e

How does a union differ from a structure, Problem: (a) (i) What is a...

Problem: (a) (i) What is a structure? (ii) How does a structure differ from an array? (b) Declare a structure, called account, that will contain the following data me

C program for the no are in ascending order , #include stdio.h> #include...

#include stdio.h> #include conio.h> #include string.h> void main() {           int i=0,j=0,k=0,l=0;           int a[3][3],temp[3][3];           clrscr();

Help, what is c++ ?

what is c++ ?

Program to display the greatest common divisor , Many modern cryptography a...

Many modern cryptography algorithms require two numbers that are coprime, or sometimes referred to as relatively prime. Two numbers are coprime if their greatest common divisor is

Minimum total number of shelv, Write a program that finds the minimum total...

Write a program that finds the minimum total number of shelv, C/C++ Programming

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