self-review questions (page 197)
3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.10, 3.11, 3.12, 3.13, 3.14, 3.15

exercises (pages 198-200)
3.1, 3.3, 3.4, 3.5, 3.6, 3.9, 3.10, 3.12, 3.13, 3.15, 3.18, 3.20

programming projects (page 201)
3.4, 3.5