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Linux 2.6 - man page for signbit (linux section 3)

SIGNBIT(3)						     Linux Programmer's Manual							SIGNBIT(3)

NAME
signbit - test sign of a real floating-point number
SYNOPSIS
#include <math.h> int signbit(x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): signbit(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
DESCRIPTION
signbit() is a generic macro which can work on all real floating-point types. It returns a nonzero value if the value of x has its sign bit set. This is not the same as x < 0.0, because IEEE 754 floating point allows zero to be signed. The comparison -0.0 < 0.0 is false, but sign- bit(-0.0) will return a nonzero value. NaNs and infinities have a sign bit.
RETURN VALUE
The signbit() macro returns nonzero if the sign of x is negative; otherwise it returns zero.
ERRORS
No errors occur.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------+---------------+---------+ |Interface | Attribute | Value | +----------+---------------+---------+ |signbit() | Thread safety | MT-Safe | +----------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).
SEE ALSO
copysign(3)
GNU
2017-09-15 SIGNBIT(3)

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