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

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

       ┌────────────────────────┬───────────────┬─────────┐
       │Interface               │ Attribute     │ Value   │
       ├────────────────────────┼───────────────┼─────────┤
       │abs(), labs(), llabs(), │ Thread safety │ MT-Safe │
       │imaxabs()               │               │         │
       └────────────────────────┴───────────────┴─────────┘

CONFORMING TO

       POSIX.1-2001,  POSIX.1-2008,  C99,  SVr4,  4.3BSD.  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.  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.

       By default, GCC handles abs(), labs(), and (since GCC 3.0) llabs() and imaxabs() as built-
       in functions.

SEE ALSO

       cabs(3), ceil(3), fabs(3), floor(3), rint(3)

COLOPHON

       This  page  is  part of release 4.04 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 http://www.kernel.org/doc/man-pages/.