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, #A Padovan string P(n) for a natural number n is defined a...

#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

Program for greatest common divisor – c++ program, Greatest Common Divisor ...

Greatest Common Divisor (GCD) - The greatest common divisor (GCD) of two integers is the largest integer that will evenly divide both integers. The GCD algorithm involves intege

Assyrian keyboard for android, Project Description: I want an app that t...

Project Description: I want an app that the user can download it from the play store and use it as a keyboard for texts and writing. Just like the Samsung keyboard and the arabi

Metric number, how are metric numer change the number of metric

how are metric numer change the number of metric

Last ant on rod, There are ''''n'''' ants on a ''''n+1'''' length rod. The ...

There are ''''n'''' ants on a ''''n+1'''' length rod. The ants are numbered from 1 to n and are initially placed at positions starting from position 1 till position n. They are mov

Area under the curve, 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

Using substitution model write corresponding constructor, (a) Pairs may be ...

(a) Pairs may be represented using a lambda. Using only lambdas, create a procedure (triple x y z) that constructs a triplet. You may NOT use car, cons or cdr in the triplet proced

Explain the #define directive, The #define Directive The #define direct...

The #define Directive The #define directive explains a macro which is a text string represented by a name. Whenever the pre-processor finds this name in the program, it is repl

Stack over flow for sun sparc, Please use C or C++ to write your programs. ...

Please use C or C++ to write your programs. Our homework will focus on SUN sparc machines because to exploit x86 stack-overflow is too easy. This is not just a programming assignme

Abcd, #question.gsdjfhjhjfkfk.

#question.gsdjfhjhjfkfk.

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