Comments on Exam 3
------------------
<<< General >>>

o  There will not be example problems posted since the previous exams
   and homework should be sufficient.

<<< Coverage >>>

o  Some questions are exactly the same as on exam 2, but with a (possibly)
   different interpreter.  They ask about the parameter passing protocol of
   the interpreter, static versus dynamic binding, and support for recursive
   procedure calls, etc.

o  Write programs that follow the syntax of the interpreter to do various
   things.  For example, compute a factorial.

o  From chapter 5, follow the execution of a complex example in the OOP
   language demonstrating both dynamic method dispatch and static method
   dispatch.

o  Be able to add extensions to the interpreter.  These may be new primitives,
   new syntax, etc.

o  Know enough about chapter 4 and types to answer questions about how
   type checking works and extend it in modest ways (see HW #9).

o  Write simple Scheme code and be able to translate simple Scheme code
   into continuation-passing-style.