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

Advanced features of c, We are now quite happy to use the basic mathematica...

We are now quite happy to use the basic mathematical expressions, however in engineering we use scientific functions i.e Sin , Cos  , ln etc . Within C we have the following functi

Decodethecode.h, decodes the sending smuggler string from the number format...

decodes the sending smuggler string from the number format into plain text

Boolean functions and simple logic design, The digital signal is one which ...

The digital signal is one which only consists of two states i.e. logic '1'   (+5 volts) and logic '0' (0 volts). Various electronic blocks use logic and these form the basis of a m

Change to palindrome, A palindrome is a string that reads the same from bot...

A palindrome is a string that reads the same from both the ends. Given a string S convert it to a palindrome by doing character replacement. Your task is to convert S to palindrome

Define external storage class - computer programming, Define External Stora...

Define External Storage Class - computer programming? When a variable is declared outside a function the storage is permanently assigned to it and its storage class is 'extern'

Using only arrays, write c program to do the following : -fill 2 dimensiona...

write c program to do the following : -fill 2 dimensional array (square matrix array with size=4). -ask the user to enter any integer number and add this number to the diagonals -o

Padovan string, padovan string problem program 1 : package test.padovan...

padovan string problem program 1 : package test.padovanstring; public class PadovanString {     public int stringOccurrences(int n, String str){        if(n >= 40)

How to define a structure, How to Define a Structure? Structure declara...

How to Define a Structure? Structure declarations are rather more complicated than array declarations, ever since a structure must be defined in terms of its individual members

Define one's complement operator, Define One's Complement Operator? The...

Define One's Complement Operator? The one's complement operator, occasionally called the "bitwise NOT" or "bitwise complement" operator produces the bitwise one's complement of

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