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Is it a bug in arithmetic operation, in printf ???

Good day, 

(define (test a)
  (printf "~%~s" a))

(test (/ (+ 5 -10) 10)) ;; display -1.5
(test (/ (+ 8 -10) 10)) ;; display -1.8

The answer should always be between -1.0 and 1.0

I use DrScheme, version 200alpha12, english 
with windows XP;  pentium iv;

Andre Mayers