abs(3) -- Linux man page
NAME
abs, labs, llabs, imaxabs - compute the absolute value of an integer
SYNOPSIS
#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);
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.
CONFORMING TO
SVID 3, POSIX.1, BSD 4.3, ISO/IEC 9899 (C99). POSIX.1 (1996 edition) only
requires the abs() function. ISO/IEC 9899:1990 (C89) only
includes the abs() and labs() functions; the functions
llabs() and imaxabs() were added in C99.
NOTES
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.
SEE ALSO
ceil(3),
floor(3),
fabs(3),
rint(3)
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