From: Jim Pryor <profjim@jimpryor.net>
Date: Sun, 3 Oct 2010 20:29:13 +0000 (-0400)
Subject: week3 evaluator fix
X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=70fe413bb1da01b9604f112ae660c2d6ddbc83d9

week3 evaluator fix

Signed-off-by: Jim Pryor <profjim@jimpryor.net>
---

diff --git a/assignment_3_evaluator.mdwn b/assignment_3_evaluator.mdwn
index 099bb76b..b81a9017 100644
--- a/assignment_3_evaluator.mdwn
+++ b/assignment_3_evaluator.mdwn
@@ -2,6 +2,7 @@ Here are the definitions pre-loaded for working on assignment 3:
 
 <textarea id="INPUT" style="border: 2px solid black; color: black; font-family:
 monospace; height: 3in; overflow: auto; padding: 0.5em; width: 100%;">
+
 	; booleans
 	let true = \x y. x in
 	let false = \x y. y in
@@ -14,10 +15,10 @@ monospace; height: 3in; overflow: auto; padding: 0.5em; width: 100%;">
 	let make_list = \h t. make_pair false (make_pair h t) in
 	let head = \l. isempty l err (l snd fst) in
 	let tail = \l. isempty l err (l snd snd) in
-	;
+	
 	; a list of numbers to experiment on
 	let mylist = make_list 1 (make_list 2 (make_list 3 empty)) in
-	;
+	
 	; church numerals
 	let iszero = \n. n (\x. false) true in
 	let succ = \n s z. s (n s z) in
@@ -25,12 +26,12 @@ monospace; height: 3in; overflow: auto; padding: 0.5em; width: 100%;">
 	let pred = \n. iszero n 0 (length (tail (n (\p. make_list junk p) empty))) in
 	let leq = \m n. iszero(n pred m) in
 	let eq = \m n. and (leq m n)(leq n m) in
-	;
+	
 	; a fixed-point combinator for defining recursive functions
 	let Y = \f. (\h. f (h h)) (\h. f (h h)) in
-	;
+	
 	let length = Y (\length l. isempty l 0 (succ (length (tail l)))) in
-	;
+	
 	; synonyms
 	let makePair = make_pair in
 	let nil = empty in
@@ -38,8 +39,9 @@ monospace; height: 3in; overflow: auto; padding: 0.5em; width: 100%;">
 	let makeList = make_list in
 	let isZero = iszero in
 	let mult = mul in
-	;
+	
 	length (tail mylist)
+
 </textarea>
 <input id="PARSE" value="Normalize" type="button">
 <input id="ETA" type="checkbox">do eta-reductions too