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

The square roots of the integers from 1 to 100, Assume we wish to partition...

Assume we wish to partition the square roots of the integers from 1 to 100 in to two piles of fifty numbers every, such that the sum of the numbers in the first pile is as close as

Explain logical operators, Logical Operators We say any expression that...

Logical Operators We say any expression that evaluates to zero is a FALSE logic condition and that evaluating to non-zero value is a TRUE condition. Logical operators are usefu

Write a recursive implementation of euclid algorithm, Write a recursive imp...

Write a recursive implementation of Euclid's algorithm for finding the greatest common divisor (GCD) of two integers. Descriptions of this algorithm are available in algebra books

Program is to define a class as teacher, Program is to define a class as te...

Program is to define a class as teacher: Program is to define a class as teacher and collect information about them by using classes and object class teacher   {   pr

Example of structure, Example of structure: struct item {       ...

Example of structure: struct item {                 int element;                 node_ptr next; }; typedef node_ptr stack; stack create(void) {

Storing street addresses with doubly linked lists, Write a C++ program with...

Write a C++ program with header and source files to store street addresses using the Doubly Linked List ADT. Modify the Node class from Lab Assignment 3 so that it becomes a node i

Described the isa and hasa class relationships. , Described the ISA and HAS...

Described the ISA and HASA class relationships. How would you apply each in a class design? A: A specialized class "is" specialization of another class and, thus, has the ISA re

Blanche has a fashion design company called BLB_Best_Clothin, Blanche has a...

Blanche has a fashion design company called BLB_Best_Clothing Pty. That she has just opened recently

Should one design a classes from the outside, Should one design a classes f...

Should one design a classes from the outside (interfaces first) or inside (data first)? A: From the outside. A superior interface provides a simplified view which is express

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