CS 342 Lecture -*- Outline -*-

* Control structures and structured programming (omitted in Spring 1990)
**	case and the labeling principle
***		Labeling principle: for long lists, associate labels with each
			item and allow users to specify labeled items in any
			order.

***		Implementation: branch table (jump indirect based on index)
			usual method, linear

**	with
		used with records
		---------
		with instr do
			case s of	{instead of instr.s}
				case op of  {instead of instr.op}
			...
		end
		---------
		allows user to do common subexpression elimination
			(preservation of information principle)
		problem: meaning when expression changes in body of with?