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

Common c control flow instructions, In this Lab you will code 8086 assemble...

In this Lab you will code 8086 assembler equivalents (Virgo) for common C control flow instructions. This will give you an appreciation for how control flow is implemented in assem

Define four facilities provided by c language preprocessor, Define Four Fac...

Define Four Facilities Provided by C Language Preprocessor? The C language preprocessor provides four separate facilities that you can use as you see fit:   Inclusion

Answer, what is spanning tree? explain prims algorithm spanning tree?

what is spanning tree? explain prims algorithm spanning tree?

Decode the code, Smugglers are becoming very smart day by day. Now they hav...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

Develop banking software and payment gateway system, Project Description: ...

Project Description: 1) Develop banking software 2) Payment Gateway System There is some other system available for development. I'm willing to show long-term opportunity

Flash my terminal vx670, Flash my terminal vx670 Project Description: ...

Flash my terminal vx670 Project Description: Have VeriFone software need it to communicate with the vx670 through com port 1 it is not talking I'm not sure why have all the r

Write a c program to input three real numbers, Write a C program to input t...

Write a C program to input three real numbers and  print them out as follows : The first variable is ....... and the second one is ...... The last variable is .......... T

C program for function of compound interest, C Program for FUNCTION  OF CO...

C Program for FUNCTION  OF COMPOUND INTEREST float ci(float,float,float); void main() {           float p=0,r=0,n=0,k=0;           clrscr();           printf("EN

Define enumeration in computer programming, Define Enumeration in Computer ...

Define Enumeration in Computer Programming? Enumerated types enclose a list of constants that are able to be addressed in integer values. We can declare variables and types

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