Q: What is a friend?
Q: Do friends violate encapsulation?
Q: What are some advantages/disadvantages of using friend functions?
Q: Should my class declare a member function or a friend function?
Q: How can I provide printing for my class Fred?
Q: But shouldn't I always use a printOn() method rather than a friend function?
Q: How can I provide input for my class Fred?
Q: How can I provide printing for an entire hierarchy of classes?
