Answer Posted / varun sir

a virtual function is used to avoid duplicacy in derived
classes. suppose that there is a base class which has two
properties a and b. now suppose that two derived classes
named 'der1' and 'der2' are deriving from that base class,
then both properties a and b of base class will be
inherited to both of the derived classes. now if a new
class is derived from 'der1' and 'der2' then both of the
properties a and b of 'der1' and 'der2' will also be
inherited into newly derived class. this will cause
duplicacy in newly obtained derived class. so in order to
avoid this duplicacy , we use virtual functions.

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