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 the relationship between an array and pointers, Relationship betwee...

Relationship between an Array and Pointers. Consider the following. int arr[] = {0,1,2,3,4,5,6,7,8,9}; If we write arr , it is considered as the address of the first elem

Which one would you prefer - a macro or a function, Which one would you pre...

Which one would you prefer - a macro or a function? Actually it depends on the purpose of program! - In case of macros, corresponding code is inserted directly into your sou

Priority Queue, Ask question #Minimum 100 words acceptedEducational Objecti...

Ask question #Minimum 100 words acceptedEducational Objectives: After completing this assignment, the student should be able to accomplish the following: Apply generic algorithms i

Program of conversion between objects of different classes, Conversion betw...

Conversion between Objects of Different Classes As the compiler does not know anything about the user-defined type, the conversion instructions are to be specified in a functio

Functions, what is the difference between call by reference and call by poi...

what is the difference between call by reference and call by pointer method?

Padovan String, A Padovan string P(n) for a natural number n is defined as:...

A Padovan string P(n) for a natural number n is defined as: P(0) = ‘X’ P(1) = ‘Y’ P(2) = ‘Z’ P(n) = P(n-2) + P(n-3), n>2 where + denotes string concatenation. For a string of t

Coding, d county is very famous for luminous jewels. Luminous jewels are us...

d county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Necklaces

Recursion, write a cprogram to calculate fraction through recursion

write a cprogram to calculate fraction through recursion

Decode, Problem Description Smugglers are becoming very smart day by day. N...

Problem Description Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new techn

Describe the oops concept - class, There are so many different concepts rel...

There are so many different concepts related with OOP (Object-oriented programming) such as: Class Object Inheritance Polymorphism Abstraction Encapsulation

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