Sep 19, 2003
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- Continuation of scoping

- Notion of a "block-structured" language
	- block: a group of statements w/ their
          own declarations (scope)

- Advantages of static scoping
	- readability
	- predictability
	- type checking/validation

- Some aspects of dynamic scoping
	- flexibility
	- sometimes makes things easy
		- (e.g., no need to pass params
		if they are present in an outer scope)
	- difficult to debug
	- no locality of access
	- can have unintended consequences

- What does "static" mean in C?
	- the variable is bound statically to a location
	  and doesn't change during run-time
	- but its lifetime is dynamic!
	- simple usage: a function that returns
	  the # times it is called

- Notion of referencing environment
	- set of variables that are visible
	  at any given point in the program
	- worked out examples from book

- How memory is allocated
	- two "areas" moving toward each other
	- stack: for runtime use under control of system
	- heap: legalized mess, for use by programmer

- Some problems you will run into, during memory tinkering
	- garbage
	- dangling references (e.g., 404 in HTTP)
	- aliases

- <end of chap 5>

- Chapter 6: types
	- what is a type?
	- primitive and constructed types