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 with thread , #I have assignment c with unix thread multiplication progr...

#I have assignment c with unix thread multiplication program ..

Model view controler, store the name of the political parties and the corre...

store the name of the political parties and the corresponding votes in two lists of equal length. access the lists is provided by two methods, each of which creates an interator th

Asset pricing project, In the final project assignment you are asked to dev...

In the final project assignment you are asked to develop an OOP C++ class hierarchy for derivative pricing, using the binomial tree and Black-Scholes option pricing methods. You wi

When should you employ multiple inheritance?, Q: When should you employ mul...

Q: When should you employ multiple inheritance? A:There  are  three  acceptable  answers:-  "Rarely," "Never," and  "while  the  problem  domain cannot be modeled accurately any

Described the differences among a c++ struct & c++ class?, Described the di...

Described the differences among a C++ struct & C++ class? A: The default member & base class access specifies are distinct. It is one of the commonly misunderstood aspects of C+

Custom scans and alerts think or swim, Custom Scans and Alerts Think or Swi...

Custom Scans and Alerts Think or Swim Project Description: I am seeking somebody to make me several Custom Scans and Alerts on Thinkorswim TOS Skills required are C++ Prog

What do you mean by inheritance, Inheritance is the process of forming new ...

Inheritance is the process of forming new classes, called derived classes, from existing classes or base classes. The derived class inherits all the capabilities of the base class,

Square maze, SquareMaze The SquareMaze class should be declared and defined...

SquareMaze The SquareMaze class should be declared and defined in maze.h and maze.cpp, respectively. Each SquareMaze object will represent a randomly-generated square maze and its

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