Question

State characteristics of Friend Function.

Answer 1

1. Even though it’s declared inside a class, it isn’t a “member.” You don’t use object.function() To call it, you just call it like a regular function.
2. This is a common point of confusion. While it has permission to see private data, it doesn't "live" inside the object, so it must be told which object to look at using the dot operator (e.g., obj.data).
3.  It doesn't matter if you put the friend declaration under public: or private:Its status and access rights remain exactly the same.
4. Since it’s not a member function (and doesn’t have a this pointer), it almost always takes an object of the class as a parameter, so it has something to work on.