1ABS(3)                     Linux Programmer's Manual                    ABS(3)
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NAME

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

9       #include <stdlib.h>
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11       int abs(int j);
12       long int labs(long int j);
13       long long int llabs(long long int j);
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15       #include <inttypes.h>
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17       intmax_t imaxabs(intmax_t j);
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19   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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21       llabs():
22           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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DESCRIPTION

25       The  abs() function computes the absolute value of the integer argument
26       j.  The labs(), llabs() and imaxabs() functions  compute  the  absolute
27       value  of  the argument j of the appropriate integer type for the func‐
28       tion.
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RETURN VALUE

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

35       For   an   explanation   of   the  terms  used  in  this  section,  see
36       attributes(7).
37
38       ┌───────────────────┬───────────────┬─────────┐
39       │Interface          │ Attribute     │ Value   │
40       ├───────────────────┼───────────────┼─────────┤
41       │abs(), labs(),     │ Thread safety │ MT-Safe │
42       │llabs(), imaxabs() │               │         │
43       └───────────────────┴───────────────┴─────────┘

CONFORMING TO

45       POSIX.1-2001,  POSIX.1-2008,  C99, SVr4, 4.3BSD.  C89 only includes the
46       abs() and labs() functions; the functions llabs()  and  imaxabs()  were
47       added in C99.
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NOTES

50       Trying  to  take the absolute value of the most negative integer is not
51       defined.
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53       The llabs() function is included in glibc since version 2.0.  The imax‐
54       abs() function is included in glibc since version 2.1.1.
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56       For   llabs()   to   be   declared,  it  may  be  necessary  to  define
57       _ISOC99_SOURCE or _ISOC9X_SOURCE (depending on the  version  of  glibc)
58       before including any standard headers.
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60       By  default, GCC handles abs(), labs(), and (since GCC 3.0) llabs() and
61       imaxabs() as built-in functions.
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SEE ALSO

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

67       This page is part of release 4.15 of the Linux  man-pages  project.   A
68       description  of  the project, information about reporting bugs, and the
69       latest    version    of    this    page,    can     be     found     at
70       https://www.kernel.org/doc/man-pages/.
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74GNU                               2016-03-15                            ABS(3)
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