Define virtual function?, C/C++ Programming

Define virtual function?

Posted Date: 3/15/2013 6:20:12 AM | Location : United States





A: While derived class overrides the base class method through redefining the same function, then if client wished to access redefined the method from derived class via a pointer from base class object, then you have to described this function in base class as virtual function.

class parent                       

{

void Show()

{

cout << "i''m parent" << endl;

}

};

class child: public parent

{

void Show()

{

cout << "i''m child" << endl;

}

};

parent * parent_object_ptr = new child; parent_object_ptr->show() // calls parent->show() now we goto virtual world...

class parent

{

virtual void Show()

{

cout << "i''m parent" << endl;

}

};

class child: public parent

{

void Show()

{

cout << "i''m child" << endl;

}

};

parent * parent_object_ptr = new child;

parent_object_ptr->show() // calls child->show()

 

Posted by | Posted Date: 3/15/2013 6:20:39 AM

A: While derived class overrides the base class method through redefining the same function, then if client wished to access redefined the method from derived class via a pointer from base class object, then you have to described this function in base class as virtual function.

class parent                       

{

void Show()

{

cout << "i''m parent" << endl;

}

};

class child: public parent

{

void Show()

{

cout << "i''m child" << endl;

}

};

parent * parent_object_ptr = new child; parent_object_ptr->show() // calls parent->show() now we goto virtual world...

class parent

{

virtual void Show()

{

cout << "i''m parent" << endl;

}

};

class child: public parent

{

void Show()

{

cout << "i''m child" << endl;

}

};

parent * parent_object_ptr = new child;

parent_object_ptr->show() // calls child->show()

 

Posted by | Posted Date: 3/15/2013 6:29:13 AM

A: While derived class overrides the base class method through redefining the same function, then if client wished to access redefined the method from derived class via a pointer from base class object, then you have to described this function in base class as virtual function.

class parent                       

{

void Show()

{

cout << "i''m parent" << endl;

}

};

class child: public parent

{

void Show()

{

cout << "i''m child" << endl;

}

};

parent * parent_object_ptr = new child; parent_object_ptr->show() // calls parent->show() now we goto virtual world...

class parent

{

virtual void Show()

{

cout << "i''m parent" << endl;

}

};

class child: public parent

{

void Show()

{

cout << "i''m child" << endl;

}

};

parent * parent_object_ptr = new child;

parent_object_ptr->show() // calls child->show()

 

Posted by | Posted Date: 3/15/2013 6:29:27 AM


Related Discussions:- Define virtual function?, Assignment Help, Ask Question on Define virtual function?, Get Answer, Expert's Help, Define virtual function? Discussions

Write discussion on Define virtual function?
Your posts are moderated
Related Questions
Overloading Binary Operators Using Friend Function class SI {float i,p,n,r,a; public: SI(){}; SI(int gp,int gn, int gr); void putdata(void); friend SI operato

The program sorting.cpp contains a main function for testing the operation of several sort algorithms over various data sizes and data set organisations. The program understands

(a) Write a procedure called (area-of-rectangle h w) that computes the area of a rectangle of height h and width w. (b) Write a procedure called (area-of-circle r) that computes


A:  it is containing and hiding Information regarding an object, like internal data structures and code. It isolates the internal complication of an object's operation from the res

how to do an array

(a) Define a procedure (deep-member x e) that takes a list x and an element e and returns #t if the element e is in the list or in any lists that the list x contains. e.g., (dee

I have a very confusing assignment and I''m struggling to find the right place to begin or how to break the problem down.


Question: (a) (i) What is recursion? (ii) What advantage is there in its use? (iii) What disadvantage is there in its use? (b) The factorial of a positive number can b