what is virtual function in c++
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Answer / achal
the concept of vitual function comes when inheritance is at
work. If the overriden function is not made virtual in base
class , then pointer of derived class will call the funtion
in base class(instead it should have called the one from
derived class.)
this is why we make the function in base as virtual.
| Is This Answer Correct ? | 37 Yes | 6 No |
Answer / sree
virtual function comes into picture while inheriting the
base class functions to the derived class functions.
ifthe virtual isnot used then the pointer of derived class
points to the baseclass function
| Is This Answer Correct ? | 28 Yes | 1 No |
Answer / indu
IT'S OVERRIDING A BASE CLASS DEFINITION AT RUN TIME.MEMBER
FUNCTION IN BASE CLASS AND DERIVED CLASS IS SAME. NORMALLY
IT INVOKE THE BASE CLASS DEFINITION IF BOTH FUNCTION NAME
IS SAME.BUT WE NEED TO ACCESS THE DERIVED CLASS DEFINITION
WE GO FOR VIRTUAL FUNCTION
| Is This Answer Correct ? | 20 Yes | 3 No |
Answer / b.balaganesan
Virtual, as the name implies, is something that exists in
effect but not in reality. The concept of virtual function
is the same as a function, but it does not really exist
although it appears in needed places in a program. The
object-oriented programming language C++ implements the
concept of virtual function as a simple member function,
like all member functions of the class.
Need for Virtual Function:
The vital reason for having a virtual function is to
implement a different functionality in the derived class.
For example: a Make function in a class Vehicle may have to
make a Vehicle with red color. A class called FourWheeler,
derived or inherited from Vehicle, may have to use a blue
background and 4 tires as wheels. For this scenario, the
Make function for FourWheeler should now have a different
functionality from the one at the class called Vehicle.
This concept is called Virtual Function.
| Is This Answer Correct ? | 10 Yes | 3 No |
Answer / hemin_sdek@yahoo.com
IT'S OVERRIDING A BASE CLASS DEFINITION AT RUN TIME.MEMBER
FUNCTION IN BASE CLASS AND DERIVED CLASS IS SAME. NORMALLY
IT INVOKE THE BASE CLASS DEFINITION IF BOTH FUNCTION NAME
IS SAME.BUT WE NEED TO ACCESS THE DERIVED CLASS DEFINITION
WE GO FOR VIRTUAL FUNCTION
| Is This Answer Correct ? | 6 Yes | 2 No |
Answer / guest
virtual funtion in cpp is define as globle acess in the
variable.
| Is This Answer Correct ? | 14 Yes | 41 No |
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