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0) Administrative
- questions about A2?
- hw: read 6.4-6.7 (next person)
- exam back: avg 71, report format, go over written part, answer questions

1) Last time- finished if statements (conditionals)
- finish up exercises
- quiz for chapter 5

2) Go over 6.1-6.3 in your groups

3) Highlights of material

	A. Big picture: sometimes you want to repeat something a lot of times
		- creating 10 Robots, or 100
		- impractical to type even one line 100 times
		- a loop lets you repeat a block of code a certain # of times, or
		  until a certain condition is met

	B. Simplest version: while loop
		- add 3 robots to an arena
			int num = 0;
			while (num < 3) {
				Robot r = new Robot(...);
				arena.add(r);
				num++;
			}
		- you do not have to do this in A2, but you may if you want
		- boolean condition, loop header, loop body, rule with braces
		- exactly what code does; draw diagram for it
		- count-controlled: runs a fixed number of times (3)

		* Infinite loop- condition never goes false 
			- if you forget to update the count variable (num)
			- book has other examples, and we'll debug some
		* Off-by-one- boundary conditions off
			- usually go from 0 to < n to run n times (or: 1 to <= n)

	C. Sentinel-controlled loop: runs til condition met, as long as necessary
		- get a non-negative input value with a while loop
			int x = getInt();
			while (x < 0) {
				S.o.p("Try again");
				x = getInt();
			}
		- priming read (x declared and initialized outside loop)
		- goes until they get it right

	D. Overflow: when you add to a number and it gets too big for its type
			int i;
			double d;
			while(true) {
				i++;
				d++;
			}
		- after a LONG time, these will overflow
		- int hits ~2 billion, wraps to negative ~2 billion (surprise!)
		- double hits ~1.8^308 and becomes "Infinity" (if you wondered) 

	E. Another loop: do-while (same idea, details different)
		- text-based menu where entering 0 means stop game
			int option;
			do {
				option = getInt();
				switch(option) {...} // do the menu option
			} while (option > 0);
		- exactly what code does; draw diagram for it
		- this is a posttest loop (test comes after body goes once)
		- while is a pretest loop (test comes before body ever goes)

4) Summary
- while loops, do-while loops, infinite loops, off-by-one errors

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