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  1. ; binary gap
  2.  
  3. (define-syntax while
  4.   (syntax-rules ()
  5.     ((while pred? body ...)
  6.       (do () ((not pred?)) body ...))))
  7.  
  8. (define (gap n)
  9.   (while (even? n) (set! n (/ n 2)))
  10.   (let loop ((n n) (curr 0) (maxi 0))
  11.     (cond ((zero? n) maxi)
  12.           ((even? n) (loop (/ n 2) (+ curr 1) maxi))
  13.           (else (loop (quotient n 2) 0 (max curr maxi))))))
  14.  
  15. (display (map gap '(9 15 20 529))) (newline)
Success #stdin #stdout 0s 42848KB
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https://ideone.com/DhZwaR
language:
Scheme (guile 2.2.4)
created:
6 years ago
visibility:
public

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