Need help Accessing a NAN

norm@dad.dad.org norm@dad.dad.org
Mon Jan 14 16:51:00 GMT 2002


norm@dad.dad.org writes:
>Under Linux I do:
>
>include <math.h>
>...
>reciprocal=NAN;
>
>
>When I try to compile this under cygwin, gcc complains that NAN is undefined.
>
>Under cygwin, "man nan", tells me about a function named nan(), also using math.h.
>When I try to use it, gcc complains about an implicit declaration of nan().


I solved this problem myself. Albeit very inelegantly

inline double nan()
{
  # ifdef NAN
     return NAN;
  #else
    double x=0.0;
    return 0/x;
  #endif
}


    Norman Shapiro
    798 Barron Avenue
    Palo Alto CA 94306-3109
    (650) 565-8215
    norm@dad.org

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