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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.

CONFORMING TO

       SVr4, POSIX.1-2001, 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 built-in functions.  GCC 3.0 also handles llabs() and
       imaxabs() as built-ins.

SEE ALSO

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

COLOPHON

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