Issue 0224: fpclassify return is not defined

This issue has been automatically converted from the original issue lists and some formatting may not have been preserved.

Authors: Bill Plauger (US)
Date: 2000-04-10
Submitted against: C99
Status: Fixed
Fixed in: C99 TC2
Converted from: summary-c99.htm, dr_224.htm

Summary

The standard header <math.h> does not define a use for FP_INFINITE and does not define what the function fpclassify returns.

Comment from WG14 on 2002-03-06:

Committee Discussion

This seems clear from a combination of 7.12.3.1 paragraph 2 and 7.12 paragraph 6.

Don't see what Plauger's comments in regard to FP_INFINITE is, and didn't consider that there is any problem.

Technical Corrigendum

In 7.12 paragraph #6 a new term "number classification macro" should be introduced, and the reword the first sentence to:

The number classification macros are:

FP_INFINITE
FP_NAN
FP_NORMAL
FP_SUBNORMAL
FP_ZERO