NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

       #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    [Toc]    [Back]

       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    [Toc]    [Back]

       Returns the absolute value of the integer argument, of the  appropriate
       integer type for the function.

CONFORMING TO    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       ceil(3), floor(3), fabs(3), rint(3)



GNU				  2000-12-17				ABS(3)