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odd? should check absolute value of remainder

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Alex Shinn 2012-11-01 20:33:37 +09:00
parent c0fc89ece4
commit e53230c439
1 changed files with 1 additions and 1 deletions
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lib/init-7.scm
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@ -1040,7 +1040,7 @@
(define (positive? x) (> x 0)) (define (positive? x) (> x 0))
(define (negative? x) (< x 0)) (define (negative? x) (< x 0))
(define (even? n) (= (remainder n 2) 0)) (define (even? n) (= (remainder n 2) 0))
(define (odd? n) (= (remainder n 2) 1)) (define (odd? n) (= (abs (remainder n 2)) 1))
(define (abs x) (if (< x 0) (- x) x)) (define (abs x) (if (< x 0) (- x) x))