10.9 Exercises

1:	What is round-off error? How does it accumulate?
2:	What is a derived attribute?
3:	What is the most common implementation of an association?
4:	What are some other possible implementations of associations?
5:	What are the rules used to determine visibility?
6:	What are they four kinds of visibility and how are the denoted?
7:	What does «friend» dependency indicate? What is a reasonable use of it?
8:	What is the difference between an O(n) and O(log n) algorithm?
9:	What is the common way of indicating error conditions in C? What are the problems with it?
10:	What is the common way of indicating error conditions in C++? What are the advantages and problems with that?