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Plan 9 - man page for nan (plan9 section 2)

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NAN(2)											   NAN(2)

       NaN, Inf, isNaN, isInf - not-a-number and infinity functions

       #include <u.h>
       #include <libc.h>

       double NaN(void)

       long   Inf(int)

       int    isNaN(double)

       int    isInf(double, int)

       The  IEEE  floating  point  standard defines values called `not-a-number' and positive and
       negative `infinity'.  These values can be produced by such things as overflow and division
       by  zero.  Also, the library functions sometimes return them when the arguments are not in
       the domain, or the result is out of range.

       NaN returns a double that is not-a-number.  IsNaN returns true if its argument  is  not-a-

       Inf(i)  returns	positive  infinity  if	i is greater than or equal to zero, else negative
       infinity.  IsInf returns true if its first argument is infinity with the same sign as  the
       second argument.


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