abs
Section: C Library Functions (3)
Updated: 2022-12-29
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NAME
abs, labs, llabs, imaxabs - 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);
#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
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.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
Interface | Attribute | Value
|
abs(),
labs(),
llabs(),
imaxabs()
| Thread safety | MT-Safe
|
STANDARDS
POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD.
NOTES
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.
SEE ALSO
cabs(3),
ceil(3),
fabs(3),
floor(3),
rint(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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