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
Describe spaghetti programming. - Spaghetti programming refers to codes which tend to get tangled and overlapped throughout the program. - It makes a program complex and ana

Question Write a program using c++ for the above function , at a= 1000, b=10 -3 ,10 -2 ,10 -4


What is the difference among malloc/free and new/delete? A: Malloc/free do not know about destructors and constructors. New & delete create and destroy objects, whereas malloc &

#queWrite a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points c

Write a program to determine V c for a given value of time (t)   #include stdio.h #include math.h void main() {      char prompt;   float vs,cr,t,vc;   /* input time */

At a shop of marbles, packs of marbles are prepared. Packets are named A, B, C, D, E …….. All packets are kept in a VERTICAL SHELF in random order. Any numbers of packets with thes

construct a console programme for a bank ATM machine.


Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b