Answer Posted / navin c. pandit

In Interface, all the member functions are abstract implicitly
so it is imp. to define all fn. declared inside Interface.
Moreover, we cann't define a fn. or we cann't declare any
member variable in an Interface. Also, we cann't declare or
define any non-abstract method in Interface.

In Abstract class, we can declare an abstract method as well
as we can also define a non-abstract method. We can also
declare a variable member in abstract class.

In both the condition, declared abstract method is
implemented out side the class i.e in derived class which
inherits Interface/Abstract class, whatever you have used.

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