CS 227 Lecture -*- Outline -*-

* An exercise in problem solving and recursion
	This is to be used at the end of Chapter 4

** explain the baseball ideas in the following
-------------
    YEAR  AB   H 2B 3B HR BB SB CS
Hank Aaron
    1959 629 223 46  7 39 51  8  0
    1971 495 162 22  3 47 71  1  1

AB = At Bat (Chances)
H = Hits = 1B + 2B + 3B + 4B
1B = singles = H - (2B+3B+HR)
2B = doubles (2 bases)
3B = triples (3 bases)
HR = 4B = home runs (4 bases)
BB = base on balls (walk, 1 base)
SB = stolen base (1 base)
CS = caught stealing

Total Bases = 1B + 2*2B + 3*3B + 4*HR
   + SB + BB

Total Average = (Total Bases)
               / (AB - H + CS)
-------------

** Give them 2 minutes to formulate questions on the following problems
-------------
   POORLY SPECIFIED PROBLEMS

1. Find a player's home runs
 for a given year from the player's record

2. Compute a player's home runs total
 for all the given years
 (can you use iteration?)

3. Compute a player's total average
 for a given year.

4. Compute a player's total average
  for all the given years.

YOU ARE TO COME UP WITH QUESTIONS
TO CLARIFY THESE (2 minutes)
---------------
	Hint if you can't think of any questions,
		try to write down an answer
** take clarifying questions (hands up)
	they should ask about:
		what the procedures should be called
			year-homers
			career-homers
			year-total-average
			career-total-average
		what if the year isn't there (errors)
		what if the denominator is zero?
		examples:
			Aaron's TA in 1959 is about 1.089
					in 1971 about 1.181
		input format?
-------------
;   YEAR  AB   H 2B 3B HR BB SB CS
(year-homers 1959
 '((1959 629 223 46  7 39 51  8  0)
   (1971 495 162 22  3 47 71  1  1)))
-------------
** write solutions to 1-3
	Be sure to do #2 iteratively
-------------
For 15 minutes,
either in groups of 3 or 4,
write solutions to problems 1-3.

1. Find a player's home runs
 for a given year from the player's record

2. Compute a player's home runs total
 for all the given years
 (can you use iteration?)

3. Compute a player's total average
 for a given year.

;   YEAR  AB   H 2B 3B HR BB SB CS
(year-homers 1959
 '((1959 629 223 46  7 39 51  8  0)
   (1971 495 162 22  3 47 71  1  1)))
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