abs, labs, llabs, imaxabs — compute the absolute value of an integer
#include <stdlib.h>
int
abs( |
int | j) ; |
long
int labs( |
long int | j) ; |
long
long int llabs( |
long long int | j) ; |
#include <inttypes.h>
intmax_t imaxabs( |
intmax_t | j) ; |
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.
SVr4, POSIX.1-2001, 4.3BSD, C99. 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 in glibc since version 2.0, but is not in libc5 or
libc4. The imaxabs
() function
is included in glibc since version 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.
GCC handles abs
() and
labs
() as builtin functions.
GCC 3.0 also handles llabs
()
and imaxabs
() as builtins.
cabs(3), ceil(3), fabs(3), floor(3), rint(3)
|