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

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