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| From: Bradley Lucier <lucier@xxxxxxxxxxxxxxx> | Date: Sun, 23 Oct 2005 14:45:49 -0500 | | > Aubrey Jaffer <agj@xxxxxxxxxxxx> writes: | > | >> When different NaNs are returned depending on the circumstances | >> creating them, I would like my implementation to display them | >> like this: | >> | >> #<not-a-number expt> | | If "expt" means exponent, then you don't get any more | information--- in IEEE arithmetic, the exponents of all NaNs of a | given precision are the same. No, its expt as in EXPT, the Scheme procedure: (expt +inf.0 0) ==> #<not-a-number expt> (+ -inf.0 +inf.0) ==> #<not-a-number +> (/ (* 0 -inf.0) 3) ==> #<not-a-number *> (+ 5 (/ 0.0 0.0)) ==> #<not-a-number />