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- stretch 4.10-2
- testing 4.16-2
- stretch-backports 4.16-1~bpo9+1
- unstable 4.16-2
|SIGNBIT(3)||Linux Programmer's Manual||SIGNBIT(3)|
NAME¶signbit - test sign of a real floating-point number
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_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 signbit(-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).
|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).
COLOPHON¶This page is part of release 4.10 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.