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What is a friend function in C++?

(a) A function which can access all the private, protected and public members of a class

(b) A function which is not allowed to access any member of any class

(c) A function which is allowed to access public and protected members of a class

(d) A function which is allowed to access only public members of a class

This question was posed to me during an interview for a job.

This interesting question is from Friend Function in section Source Files, Classes and Operator Overloading in C++ of C++

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The correct answer is (a) A function which can access all the private, protected and public members of a class

To explain I would say: Friend function in C++ is a function which can access all the private, protected and public members of a class.

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