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  1. ; multiples of 5
  2.  
  3. (define (mult5? n)
  4.   (let outer ((n (abs n)) (power5 (list 5)))
  5.     (if (< (* (car power5) 5) n)
  6.         (outer n (cons (* (car power5) 5) power5))
  7.         (let inner ((n n) (power5 power5))
  8.           (if (null? power5)
  9.               (zero? n)
  10.               (if (< n (car power5))
  11.                   (inner n (cdr power5))
  12.                   (inner (- n (car power5)) power5)))))))
  13.  
  14. (display (mult5? 987)) (newline)
  15. (display (mult5? 985)) (newline)
Success #stdin #stdout 0.03s 8204KB
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https://ideone.com/LRuPUN
language:
Scheme (guile 2.2.4)
created:
5 years ago
visibility:
public

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