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  1. ; a simple interview question
  2.  
  3. (define (add1 x) (+ x 1))
  4. (define (sub1 x) (- x 1))
  5.  
  6. (define (sum x y)
  7.   (while (< x 0) (set! x (add1 x)) (set! y (sub1 y)))
  8.   (while (< 0 x) (set! x (sub1 x)) (set! y (add1 y)))
  9.   y)
  10.  
  11. (display (sum 3 5)) (newline)
  12. (display (sum 3 -5)) (newline)
  13. (display (sum -3 5)) (newline)
  14. (display (sum -3 -5)) (newline)
Success #stdin #stdout 0.04s 8440KB
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stdin
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Standard input is empty
stdout
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8
-2
2
-8
https://ideone.com/PXMVRM
language:
Scheme (guile 2.2.4)
created:
5 years ago
visibility:
public

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