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abs(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ATTRIBUTES \|STANDARDS \|HISTORY \|BUGS \|SEE ALSO \|COLOPHON

abs(3)                   Library Functions Manualabs(3)

NAME top

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

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <stdlib.h>int abs(intj);long labs(longj);long long llabs(long longj);unsigned int uabs(intj);unsigned long ulabs(longj);unsigned long long ullabs(long longj);#include <inttypes.h>intmax_t imaxabs(intmax_tj);uintmax_t uimaxabs(intmax_tj);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):llabs():           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112Luabs(),ulabs(),ullabs(),uimaxabs():           _ISOC2Y_SOURCE

DESCRIPTION top

       These functions compute the absolute value of the argumentj of       the appropriate integer type for the function.

RETURN VALUE top

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

ATTRIBUTES top

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

STANDARDS top

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

HISTORY top

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 top

       Forabs(),labs(),llabs(), andimaxabs(), trying to take the       absolute value of the most negative integer is not defined.

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17abs(3)

Pages that refer to this page:cabs(3), div(3), fabs(3), _Generic(3), strtoimax(3), wcstoimax(3)

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