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

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ abs(), labs(), llabs(), imaxabs()                                           │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       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.

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

       C89 only includes the abs() and labs() functions; the functions llabs() and imaxabs() were added in C99.

       Standard C library (libc, -lc)

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

       Trying to take the absolute value of the most negative integer is not defined.

       The llabs() function is included since glibc 2.0.  The imaxabs() function is included since glibc 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.

       Returns the absolute value of the integer argument, of the appropriate integer type for the function.

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

Linux man-pages 6.9.1                              2024-05-02                                             abs(3)

       C11, POSIX.1-2008.

#include<stdlib.h>intabs(intj);longlabs(longj);longlongllabs(longlongj);#include<inttypes.h>intmax_timaxabs(intmax_tj);

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

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