SIMPLE SOLUTIONS

ABS, LABS, LLABS, IMAXABS - reference manual online

Compute the absolute value of an integer.

Chapter
2015-08-08
ABS(3)                              Linux Programmer's Manual                              ABS(3)

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); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): llabs(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99
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 appro‐ priate 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). ┌────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────┼───────────────┼─────────┤ │abs(), labs(), llabs(), │ Thread safety │ MT-Safe │ │imaxabs() │ │ │ └────────────────────────┴───────────────┴─────────┘
CONFORMING TO POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD. 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. 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. By default, GCC handles abs(), labs(), and (since GCC 3.0) llabs() and imaxabs() as built- in functions.
SEE ALSO cabs(3), ceil(3), fabs(3), floor(3), rint(3)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 ABS(3)
This manual Reference Other manuals
abs(3) referred by cabs(3) | div(3) | fabs(3) | fabs(3) | strtoimax(3) | wcstoimax(3)
refer to attributes(7) | cabs(3) | ceil(3) | fabs(3) | feature_test_macros(7) | floor(3) | rint(3)