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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\" Based on glibc infopages, copyright Free Software Foundation
-.\"
-.TH signbit 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-signbit \- test sign of a real floating-point number
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B "#include <math.h>"
-.P
-.BI  "int signbit(" x ");"
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR signbit ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-.BR signbit ()
-is a generic macro which can work on all real floating-point types.
-It returns a nonzero value if the value of
-.I x
-has its sign bit set.
-.P
-This is not the same as
-.IR "x < 0.0" ,
-because IEEE 754 floating point allows zero to be signed.
-The comparison
-.I \-0.0\~<\~0.0
-is false, but
-.I signbit(\-0.0)
-will return a nonzero value.
-.P
-NaNs and infinities have a sign bit.
-.SH RETURN VALUE
-The
-.BR signbit ()
-macro returns nonzero if the sign of
-.I x
-is negative; otherwise it returns zero.
-.SH ERRORS
-No errors occur.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR signbit ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C99.
-.P
-This function is defined in IEC 559 (and the appendix with
-recommended functions in IEEE 754/IEEE 854).
-.SH SEE ALSO
-.BR copysign (3)