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

Explain protected and public in c++, Explain protected, public, private in ...

Explain protected, public, private in C++? These are three access spaecifiers in C++. - Public - Here data members and functions are accessible outside the class. - Pr

Integration, Write a program to find the area under the curve y = f(x) betw...

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. The area under a curve between two points can b

C program for function of merge , C Program for FUNCTION OF MERGE #inc...

C Program for FUNCTION OF MERGE #include conio.h> #include stdio.h> char cot(char a[],char b[]); void main() {           char a[50],b[50];           clrscr()

Using c language, I have a program and I want someone to fix it for me by u...

I have a program and I want someone to fix it for me by using basic c language program.

Advanced error checking and structures, It is standard on functions to prov...

It is standard on functions to provide some indication that the function has succeeded in its operation. Consider the Scanf function:     scanf("%d",&number1);   If the functio

Source code, processing two jobs through 2 machine

processing two jobs through 2 machine

Insert values in queue - c++ program, Insert values in queue - C++ program:...

Insert values in queue - C++ program: Write a program to insert values in queue. int main()   {         int k;     Queue timeLine;     cout     for(

Data structure, Project Description: Project is related indexing data re...

Project Description: Project is related indexing data related some data structure. I need to share all information related project later if i contact any body Skills required

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