ABS
Section: Linux Programmer's Manual (3)
Updated: 20130621
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NAME
abs, labs, llabs, imaxabs  compute the absolute value of an integer
SYNOPSIS
#include <stdlib.h>
int abs(int j);
long int labs(long int j);
long long int llabs(long long int j);
#include <inttypes.h>
intmax_t imaxabs(intmax_t j);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
llabs():

_XOPEN_SOURCE >= 600  _ISOC99_SOURCE 
_POSIX_C_SOURCE >= 200112L;
or
cc std=c99
DESCRIPTION
The
abs()
function computes the absolute value of the integer
argument j.
The
labs(),
llabs()
and
imaxabs()
functions compute the absolute value of the argument j of the
appropriate integer type for the function.
RETURN VALUE
Returns the absolute value of the integer argument, of the appropriate
integer type for the function.
ATTRIBUTES
Multithreading (see pthreads(7))
The
abs(),
labs(),
llabs(),
and
imaxabs()
functions are threadsafe.
CONFORMING TO
SVr4, POSIX.12001, 4.3BSD, C99.
C89 only
includes the
abs()
and
labs()
functions; the functions
llabs()
and
imaxabs()
were added in C99.
NOTES
Trying to take the absolute value of the most negative integer
is not defined.
The
llabs()
function is included in glibc since version 2.0, but
is not in libc5 or libc4.
The
imaxabs()
function is included in
glibc since version 2.1.1.
For
llabs()
to be declared, it may be necessary to define
_ISOC99_SOURCE or _ISOC9X_SOURCE (depending on the
version of glibc) before including any standard headers.
GCC handles
abs()
and
labs()
as builtin functions.
GCC 3.0 also handles
llabs()
and
imaxabs()
as builtins.
SEE ALSO
cabs(3),
ceil(3),
fabs(3),
floor(3),
rint(3)
COLOPHON
This page is part of release 3.54 of the Linux
manpages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/manpages/.
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 RETURN VALUE

 ATTRIBUTES

 Multithreading (see pthreads(7))

 CONFORMING TO

 NOTES

 SEE ALSO

 COLOPHON

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Time: 19:35:08 GMT, January 19, 2018