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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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abs(3) Library Functions Manual abs(3)
abs, labs, llabs, imaxabs - compute the absolute value of an
integer
Standard C library (libc, -lc)
#include <stdlib.h>
int abs(int j);
long labs(long j);
long long llabs(long long j);
#include <inttypes.h>
intmax_t imaxabs(intmax_t j);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
llabs():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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.
Returns the absolute value of the integer argument, of the
appropriate integer type for the function.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ abs(), labs(), llabs(), imaxabs() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99, SVr4, 4.3BSD.
C89 only includes the abs() and labs() functions; the functions
llabs() and imaxabs() were added in C99.
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.
cabs(3), ceil(3), fabs(3), floor(3), rint(3)
This page is part of the man-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-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. 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 is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 abs(3)
Pages that refer to this page: cabs(3), div(3), fabs(3), _Generic(3), strtoimax(3), wcstoimax(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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