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

#c++ homework, write c++programm that converts degrees Kelvin (TK) to degr...

write c++programm that converts degrees Kelvin (TK) to degrees Fahrenheit(TR) recall that TF=(9/5)TK and that TF=TR-459.67

multiplication of matrices with compatibility check, Normal 0 ...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

I need computer application/program, I need Computer application/program. ...

I need Computer application/program. Project Description:                                                                I want a project done. It is a computer desktop appli

How many non-boundary pits and peaks are on the map, Armed with your functi...

Armed with your function from above, we can do some interesting things. For instance, any pixel where the offsets are both zero is a pit (lower than all surrounding points) .

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

Vogels approximation transportation problem, Vogels approximation transport...

Vogels approximation transportation problem in c language source code

I need quantitative trading platform, Project Description: Need someone ...

Project Description: Need someone to prepare a trading platform and sophisticated trading strategy. Must have knowledge and experience in most of these: QuickFIX, Esper, Quan

Explain friend for overloading operators, Friend for Overloading Operators ...

Friend for Overloading Operators Sometimes friend functions cannot be avoided. For example with the operator overloading. Consider the following class that have data members to

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