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

#psuedocode, Create a pseudocode in getting Calendar Quarter. The program s...

Create a pseudocode in getting Calendar Quarter. The program should identify which quarter falls the given date. Note: Consider the date format DDMMYYYY.

Erp, How does an ERP System facilitates better decision making?

How does an ERP System facilitates better decision making?

Verification class, I need help to understand and do this assignment ******...

I need help to understand and do this assignment ********************************************************* You are to insert the missing code in the C program given for combinatio

What is some instance of operator overloading?, A: Here are a few of the ma...

A: Here are a few of the many instance of operator overloading: myString + yourString may concatenate two std::string objects myDate++ may increment a Date object a * b may m

Help, what is c++ ?

what is c++ ?

Program to display the greatest common divisor , Many modern cryptography a...

Many modern cryptography algorithms require two numbers that are coprime, or sometimes referred to as relatively prime. Two numbers are coprime if their greatest common divisor is

Rules of function, Rules of function: Inline function created witho...

Rules of function: Inline function created without prototype it reduces the memory and it is used only for small function. Inline function cannot have recursion, static var

How can define an array, Q: How can Define an Array? An Array is define...

Q: How can Define an Array? An Array is defined in much the alike manner as ordinary variables except that every array name must be accompanied by a size specification (that is

Programming, I have a C++ programming assignment due on 8th January. As I a...

I have a C++ programming assignment due on 8th January. As I am out of country and cannot complete it, I would like to know how much fees would you charge to complete the assignmen

C program to find vowels and remove vowels , C Program to FIND VOWELS AND R...

C Program to FIND VOWELS AND REMOVE VOWELS void main() {           char s[100],s1[100];           int i,j,k=0;           clrscr();           printf("ENTER ANY S

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