NAME

       abs, labs, llabs, imaxabs - compute the absolute value of an integer

SYNOPSIS

       #include <stdlib.h>

       int abs(int j);
       long labs(long j);
       long long llabs(long long j);

       #include <inttypes.h>

       intmax_t imaxabs(intmax_t j);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       llabs():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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(), imaxabs()                              │ Thread safety │ MT-Safe │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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

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