개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

signbit(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; oth‐
       erwise it returns zero.

ERRORS
       No errors occur.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).

       allbox;  lb  lb  lb  l  l  l.   Interface Attribute Value  T{ signbit()
       T}   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)

COLOPHON
       This  page  is  part of release 5.02 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/.



GNU                               2017-09-15                        SIGNBIT(3)