in reply to Re^2: Determining the minimum representable increment/decrement possible?
in thread Determining the minimum representable increment/decrement possible?

... where does nextafter() come from?

As pryrt noted, it's in math.h - which perl.h already (indirectly) includes.

With my MS compiler, I found matches for the string "nextafter" in: 
C:\_64\Platform_SDK\Include\crt\float.h
C:\_64\Platform_SDK\Include\crt\fpieee.h
C:\_64\Platform_SDK\Include\crt\math.h
C:\_64\Platform_SDK\src\crt\float.h
C:\_64\Platform_SDK\src\crt\fpieee.h

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Cheers,
Rob
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