Explain virtual functions, C/C++ Programming

Assignment Help:

Virtual Functions

The keyword virtual was previously used to resolve ambiguity for a class derived from two classes, both having a common ancestor. These classes are known as virtual base classes. This time it helps in implementing the idea of polymorphism with class inheritance. The function of the base class can be declared with the keyword virtual. The program with this change and its output is given below.

                class Shape

                 {

                  public :

virtual void print()

 {

                cout << " I am a Shape " << endl;

 }

                 };

                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;

                S.print();

                T.print();

                C.print();

 

                  Shape *ptr;

 

                                ptr = &S;

                                ptr -> print();

 

                                ptr = &T;

                                ptr -> print();

 

ptr = &C;

                                ptr -> print();

}

 


Related Discussions:- Explain virtual functions

Described the difference among "new" and "operator new" ?, Described the di...

Described the difference among "new" and "operator new" ? A:"operator new" works such as malloc.

Discuss polymorphism in c++, Problem 1. Discuss polymorphism in c++. ...

Problem 1. Discuss polymorphism in c++. Explaining Polymorphism 2. Write a program in c++ to read a 3X2 matrix and find smallest number in that matrix. Writin

Describe "this" pointer?, It is a pointer accessible only in the member fun...

It is a pointer accessible only in the member functions of a struct, class or union type. It points to the object for which the member function is called. Static member functions d

What are virtual functions in c++, A virtual function permits derived class...

A virtual function permits derived classes to replace the implementation given by the base class. The compiler makes sure the replacement is always known as whenever the object in

C, A Padovan string P(n) for a natural number n is defined as: P(0) = ‘X’ P...

A Padovan string P(n) for a natural number n is defined as: P(0) = ‘X’ P(1) = ‘Y’ P(2) = ‘Z’ P(n) = P(n-2) + P(n-3), n>2 where + denotes string concatenation. For a string of the c

Nested if else, input marks of c and c++ if c grater than equal to 50 grate...

input marks of c and c++ if c grater than equal to 50 grater than 50 you are pass if c greater than equal to 50 c++ less than 50 than supplementry c++ if c less then 50 and c++ gra

Define register variables - low level programming, Define Register Variable...

Define Register Variables - Low Level Programming? The Register variables are a special case of an automatic variable. The Automatic variables are allocated storage in the memo

C program for bank account, Aim: To implement a program for bank account u...

Aim: To implement a program for bank account using static data type. Code: class bank {             static int acc_no;             int acc;             float b

C++, Program to print the total marks and percentage of the 3 students usin...

Program to print the total marks and percentage of the 3 students using array

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