a. In a class, why do you include the function that overloads the stream insertion operator, b. In a class, why do you include the function that overloads the stream extraction operator, >>, as a...

a. In a class, why do you include the function that overloads the stream insertion operator, <,>

b. In a class, why do you include the function that overloads the stream extraction operator, >>, as a friend function? (5, 6)

What is returned by the function that overloads the operator >> for a class? (6)