-nan is not number

[ssqq]

-nan (NaN) should not return true with number?

Code Select Expand


> (set 'nan (sqrt -1))
> (number? nan)
true ;; should return nil


Also advise with inf. I think all NaN and Inf are "error status" that may not throw error immediatly.

So they isn't value.

[TedWalther]

-nan (NaN) should not return true with number?

Code Select Expand


> (set 'nan (sqrt -1))
> (number? nan)
true ;; should return nil


Also advise with inf. I think all NaN and Inf are "error status" that may not throw error immediatly.

So they isn't value.

Reliably getting nan and inf from the C compiler is not pleasant.  It varies between compilers and architectures and platforms.  The alternative is to write assembly language... which would really require some paid resources to keep track of all the different types of CPU.

[rickyboy]

Hello ssqq,



This is what you need: http://www.newlisp.org/downloads/newlisp_manual.html#NaNp">//http://www.newlisp.org/downloads/newlisp_manual.html#NaNp.



As a backgrounder, the committee who put together the floating point standard had a reason for admitting things like NaN as floating point "values".  Technically they are "numbers" (FP values, really).



http://grouper.ieee.org/groups/754/faq.html#exceptions">//http://grouper.ieee.org/groups/754/faq.html#exceptions

[ssqq]

I see, Reason is ANSI C could not support.

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