Answer Posted / ognas(shradha-asutosh)

in inheritance if the base class contains a virtual
function equating to zero, it is known also as do-nothing
function & that base class is called as abstract base class
as there are no instances or objects can be created by this
base class. And this pure virtual can be filled with the
codes in successiv derived classes accordin to the user
requirements.
The syntax of the pure virtual function is....

class class_name
{
visibility mode:\\should be protected:
virtual return_type function_name()=0;
}
new class_name : inheritance_type old class_name
{
........ //class body
........
}

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