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

Assignment, Develop a C++ program that uses a while to determine the gross ...

Develop a C++ program that uses a while to determine the gross pay (in Dollars) for each of several employees. The company pays “straight-time” for the first 40 hours worked by ea

Assignment question, : Write a program that prompts the user to enter five...

: Write a program that prompts the user to enter five digit positive numbers. The program then outputs the digits of the number one digit per line. Eg if the user enters 32456, th

What happens if you write following code?, What happens if you write follow...

What happens if you write following code? string& foo()

Explain integer literal, Integer literal Integer is numbers without fra...

Integer literal Integer is numbers without fractional parts. e.g. 20       // Decimal 024      // Octal     0x14     // Hexadecimal To indicate long, unsigned,

Advance in c, create a program to populate the first array then the odd num...

create a program to populate the first array then the odd number is the second array and get the sum of the second array.

Develop custom mql4 code, Develop Custom Mql4 Code/Fxdreema block Projec...

Develop Custom Mql4 Code/Fxdreema block Project Description: I need the subsequent code written in mql4 and integrated as custom block(s) in fxdreema: for each trade: C

Wap to print series from 1 to 10 & find its square and cube, WAP TO PRINT S...

WAP TO PRINT SERIES FROM 1 TO 10 & FIND ITS SQUARE AND CUBE # include stdio.h> # include conio.h> # include math.h>   void main () { int a=1,sqr=0,cube=0;

C program for sorting of long word with different string, C Program for SOR...

C Program for SORTING OF LONG WORD WITH DIFFERENT STRING #include stdio.h> #include conio.h> #include string.h>   void main() {           char n[50],c[25][25]

Thermodynamics, want to solve the thermodynamics problems on c language

want to solve the thermodynamics problems on c language

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