NAME

       abs, labs, llabs, imaxabs, uabs, ulabs, ullabs, uimaxabs - compute the absolute value of an integer

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <stdlib.h>

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

       unsigned int uabs(int j);
       unsigned long ulabs(long j);
       unsigned long long ullabs(long long j);

       #include <inttypes.h>

       intmax_t imaxabs(intmax_t j);
       uintmax_t uimaxabs(intmax_t j);

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

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

       uabs(), ulabs(), ullabs(), uimaxabs():
           _ISOC2Y_SOURCE

DESCRIPTION

       These  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(), uabs(), ulabs(), ullabs(), uimaxabs()    │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       abs()
       labs()
       llabs()
       imaxabs()
              C23, POSIX.1-2024

HISTORY

       abs()  C89, POSIX.1-1996, SVr4, 4.3BSD.

       labs() C89, POSIX.1-2001.

       llabs()
              C99, POSIX.1-2001; glibc 2.0.

       imaxabs()
              C99, POSIX.1-2001; glibc 2.1.1.

       uabs()
       ulabs()
       ullabs()
       uimaxabs()
              C2y; glibc 2.42.

BUGS

       For abs(), labs(), llabs(), and imaxabs(), trying to take the absolute value of the most negative integer
       is not defined.

SEE ALSO

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

Linux man-pages 6.15                               2025-05-17                                             abs(3)