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Floating-point round-off problems.

    Date: Thu, 10 Aug 89 08:00 PDT
    From: Spock@samson.cadr.dialnet.symbolics.com (Mr. Spock)

    Does anyone have a hack to correct for the losing floating-point math on
    these Symbolics machines?


        (- 6 5.9) returns -> 0.099999905 instead of 0.1

    --Mark Alexander

Have you considered using exact rational arithmetic instead of floating
point approximations? 

(- 6 59/10) 
==> 1/10

If you don't like reading these, you can have your output routines
convert them to floating point just for displaying to the user:

(coerce (- 6 59/10) 'float)
==> 0.1