NAME¶

abs, labs, llabs, imaxabs, uabs, ulabs, ullabs, uimaxabs - 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);

unsigned int uabs(int j);
unsigned long ulabs(long j);
unsigned long long ullabs(long long j);

#include <inttypes.h>

intmax_t imaxabs(intmax_t j);
uintmax_t uimaxabs(intmax_t j);

llabs():

    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

uabs(), ulabs(), ullabs(), uimaxabs():

    _ISOC2Y_SOURCE

DESCRIPTION¶

These 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).

STANDARDS¶

abs()

labs()

llabs()

imaxabs()

C23, POSIX.1-2024

HISTORY¶

abs()

C89, POSIX.1-1996, SVr4, 4.3BSD.

labs()

C89, POSIX.1-2001.

llabs()

C99, POSIX.1-2001; glibc 2.0.

imaxabs()

C99, POSIX.1-2001; glibc 2.1.1.

uabs()

ulabs()

ullabs()

uimaxabs()

C2y; glibc 2.42.

BUGS¶

For abs(), labs(), llabs(), and imaxabs(), trying to take the absolute value of the most negative integer is not defined.

SEE ALSO¶

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