SICP/util.scm

18 lines
340 B
Scheme
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(define (assert a b)
(cond ((equal? a b) (display "[ok]"))
(else
(display "[error] ")
(display a)
(display " != ")
(display b)))
(newline))
(define (gcd a b)
(if (= b 0) (abs a) (gcd b (remainder a b))))
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(define (average a b) (/ (+ a b) 2.0))
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(define (id n) n)
(define (inc n) (+ n 1))
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(define nil '())
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