C++ Friend Function

Friend functions

1.	A friend function declaration:
	A.	gives nonmember functions access to hidden class members
	B.	is another term for an overloaded function within a class
	C.	is any function created for you by the compiler (such as a default constructor)
	D.	is any function outside the class with the same name as a function in the class

2.	A `friend` function declaration appears:
	A.	in the header of the `friend` function outside the class
	B.	inside the class declaration to which it is a `friend`
	C.	as a separate declaration inside `main()`
	D.	anywhere prior to the function invocation

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