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

Loops, Create a program that will accept 3 numbers. The first number (num1)...

Create a program that will accept 3 numbers. The first number (num1) is the common difference and the second number (num2) is the starting number and the 3rd number (num3) is the m

Define the volatile keyword qualifiers in c language, Define the Volatile K...

Define the Volatile Keyword Qualifiers in C Language? The volatile keyword proceed as a data type qualifier and a volatile variable is for dynamic use. E.G. for data that is to

Random question, Ask question #write statement that assign random integer t...

Ask question #write statement that assign random integer to the varaible n in the (100

Derived data type, Derived Data Type: Array is derived data type to sto...

Derived Data Type: Array is derived data type to store large collection of data of only one data type. int mark[100]; char names[25]; Function: will be discussed early

C program for palindrome, C Program for Palindrome Norm...

C Program for Palindrome Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

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