2007-11-12 P68-73 Book PurpleDragonBook 2.4.6 Exercises for Section 2.4 Exercise 2.4.1 2.5 A Translator for Simple Expressions 2.5.1 Abstract and Concrete Syntax 2.5.2 Adapting the Translation Scheme 2.5.3 Procedures for the Nonterminals 2.5.4 Simplifying Translator