How do we declare an ‘interface’ class?

Question

How do we declare an &lsquo;interface&rsquo; class?

Admin · Accepted Answer

By making all the methods pure virtual in a class

Admin · Answer

It is not possible to create interface class in C++

Admin · Answer

By declaring the class as interface with the keyword &lsquo;interface&rsquo;

Admin · Answer

By making all the methods abstract using the keyword &lsquo;abstract&rsquo; in a class

Q. How do we declare an ‘interface’ class?