SICP/util.scm

17 lines
323 B
Scheme

(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))))
(define (average a b) (/ (+ a b) 2.0))
(define (id n) n)
(define (inc n) (+ n 1))