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author
barker
<barker@web>
Mon, 13 Sep 2010 13:28:36 +0000
(09:28 -0400)
committer
Lambda Wiki
<lambda@SERVER.PHILOSOPHY.FAS.NYU.EDU>
Mon, 13 Sep 2010 13:28:36 +0000
(09:28 -0400)
assignment1.mdwn
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assignment1.mdwn
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-24,14
+24,14
@@
In Racket, these can be defined like this:
(define true (lambda (t) (lambda (f) t)))
(define false (lambda (t) (lambda (f) f)))
(define true (lambda (t) (lambda (f) t)))
(define false (lambda (t) (lambda (f) f)))
-test
-8. Define a "neg" operator that negates "true" and "false".
+(8). Define a "neg" operator that negates "true" and "false".
Expected behavior: (((neg true) 10) 20) evaluates to 20,
(((neg false) 10) 20) evaluates to 10.
Expected behavior: (((neg true) 10) 20) evaluates to 20,
(((neg false) 10) 20) evaluates to 10.
-
9
. Define an "and" operator.
+
(9)
. Define an "and" operator.
10. Define an "xor" operator. (If you haven't seen this term before, here's a truth table:
10. Define an "xor" operator. (If you haven't seen this term before, here's a truth table:
+
true xor true = false
true xor false = true
false xor true = true
true xor true = false
true xor false = true
false xor true = true