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

Padovan string , write a program that counts the number of occurences of th...

write a program that counts the number of occurences of the string in the n-th Padovan string P(n) program in java // aakash , suraj , prem sasi kumar kamaraj college progr

Java code, Calculate the salary if the person work 8 hours/day and the sala...

Calculate the salary if the person work 8 hours/day and the salary/hour is RM5.20 - UML class diagaram -Class -Exception handling/assertion

Software reverse engineered, Project Description: I have software writte...

Project Description: I have software written with VB that i helped design, but now the original author died,(Neil Tromp), and the software ended up in the hands of someone else!

Describe processing an array, Describe Processing an array? The Single ...

Describe Processing an array? The Single operations which involve complete arrays are not permitted in C language. therefore if a and b are similar arrays (for example same dim

Explain the command line parameters, Explain the Command Line Parameters? ...

Explain the Command Line Parameters? The Command line arguments are parameters supplied to a program from the operating system. These arguments are parameters accepted to main

Return values, What is the purpose of return values? Can you not return any...

What is the purpose of return values? Can you not return any values from a function? If you could what would he function look like?

Write a program that illustrate Macros with Arguments, Write a program tha...

Write a program that illustrate  Macros with Arguments? Macros is able to also have arguments, just as functions can. #define AREA(x)(3.14*x*x) Then at any time the prepr

Define the assignment operators in c language, Define the Assignment Operat...

Define the Assignment Operators in c language? The assignment operators can be used to assign a value to the variable and is represented by equal to (=) sign. The Assignment ex

Find and print the oldest and the youngest employee, Draw a flowchart ...

Draw a flowchart for a program that allows the user to enter 20 names along with their ages and their Social Security Numbers in three parallel arrays. Programs shou

Develop diablo 2 lod 1.13d dupe method for closed battle.net, Develop Diabl...

Develop Diablo 2 LOD 1.13d Dupe Method for Closed Battle.net This hack is for diablo 2 lord of destruction The program must work on all realms, all cores, all ladders (4x rea

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