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ABS
!!!ABS
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
NOTES
SEE ALSO
----
!!NAME


abs, labs, llabs, imaxabs - compute the absolute value of an integer.
!!SYNOPSIS


__#include
__ ''j''__);
long int labs(long int__ ''j''__);
long long int llabs(long long int__ ''j''__);
#include
__ ''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. 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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Last edited on Tuesday, June 4, 2002 12:24:26 am by "perry"

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