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 manipulators, Manipulators There are several classes in the ios...

Manipulators There are several classes in the iostream.h header file. One of them is ios class. This class stores the format state. For example, some bits explain the base in w

Write a program in c++ to read n numbers in an array, Problem Write a p...

Problem Write a program in C++ to read N numbers in an array, the user should be able to search a particular number in the array using sequential search algorithm. Writing a

write a scheme procedure to evaluate expression, (a) Write a Scheme proced...

(a) Write a Scheme procedure to evaluate the expression: 7/6+2*5+(3*2+6*7)*4. (b) Write a Scheme procedure to evaluate the expression: 2*(-1+(-3+4*2-7)*3/(3*2)).

String, Write a program that takes 3 small letters as input and sort them a...

Write a program that takes 3 small letters as input and sort them according to their ASCII value.

Command line program to find name matches, What's a six-letter word that ha...

What's a six-letter word that has an e as its first, third, and fifth letter? Can you find an anagram of pine grave. Or how about a word that starts and ends with ant (other than a

Write a program that finds the minimum total number of shelv, At a shop of ...

At a shop of marbles, packs of marbles are prepared. Packets are named A, B, C, D, E …….. All packets are kept in a VERTICAL SHELF in random order. Any numbers of packets with thes

Need solution for simple beginner level c program, search words from a pass...

search words from a passage and return snippets in html format..

Determine the size of an interger data type without using , Determine the s...

Determine the size of an interger data type without using sizeof() function? A: #include int main() { int *i ; int *j = i + 1; cout }

., what is polymorphism

what is polymorphism

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