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

What is default argument, Default argument: When the argument is missin...

Default argument: When the argument is missing then the function will read the default value of the missing argument.  To make use of default argument functionality the argu

#title areaundercurve.c, Write a program to find the area under the curve y...

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

What is the difference between structure and class, What is the difference ...

What is the difference between structure and class? - Members of structures are public while those of a class are private. - Classes provide data hiding while structures don

201 it, overload assignment opertor to assign the data of one object to ant...

overload assignment opertor to assign the data of one object to anthor

Can i overload operator == so it allow me compare two char[], Q: Can I over...

Q: Can I overload operator == so it allow me compare two char[] by a string comparison? A: No: at least one operand of particular overloaded operator should be of some user-defi

Bus Connection, how to explain working of bus connection

how to explain working of bus connection

We are seeking someone to search mp3 link, Project Description: We are s...

Project Description: We are seeking someone to search mp3 link form audio or m3u8 for videos. Skills required are .NET, C Programming, Engineering, C# Programming

Program is to perform all the functions of super bazaar, Program is to perf...

Program is to perform all the functions that are performed in a super bazaar: class stock   {   private:     int itno;     char itname[20];     char brname[20];

Sparce matrices, Write an algorithm for multiplication of two sparse matric...

Write an algorithm for multiplication of two sparse matrices using Linked Lists.

Named what can derived class add?, New data members  New member function...

New data members  New member functions  New constructors and destructor  New friends

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