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
hi Bhasker, as we spoke tru phone ,we need a project using cloud computing .we need to present a protoype or demo on it (any thing using cloud should be fine)(ex: P2p)

conceptual difference between big o,big thete and big omega

How do one throw polymorphically?               A: Sometimes people write code such as: class MyExceptionBase { }; class MyExceptionDerived : public MyExceptionBase { };

traffic light t junction I have 21 LEDs will 6 in each side 3 for the cars the other 3 will be for the people across the street this will be for each side and the last 3 for show

Protected derivation In addition to doing private and public derivations, you may also do a protected derivation. In this situation :   The private members inherited

#question.College life is tough. Eating pizza for every meal is hitting you hard. You are looking at working out to stay healthy. You found a web site that tells you how many ca

write a program that can accept numbers and perform all the four arithmetic operation

The Switch Construct The switch statement is a multi-way decision-making construct that tests an expression matches one of a number of constant values, and branches accordingly

A string S is said to be "Super ASCII", if it contains the character frequency equal to their ascii values. String will contain only lower case alphabets (''a''-''z'') and the asci

write a program that counts the number of occurances of the string in the n-th padovan string p(n)