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1 perry 1 ABS
2 !!!ABS
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 RETURN VALUE
7 CONFORMING TO
8 NOTES
9 SEE ALSO
10 ----
11 !!NAME
12
13
14 abs, labs, llabs, imaxabs - compute the absolute value of an integer.
15 !!SYNOPSIS
16
17
18 __#include
19 __ ''j''__);
20 long int labs(long int__ ''j''__);
21 long long int llabs(long long int__ ''j''__);
22 #include
23 __ ''j''__);
24 __
25 !!DESCRIPTION
26
27
28 The __abs()__ function computes the absolute value of the
29 integer argument ''j''. The __labs()__, __llabs()__
30 and __imaxabs()__ functions compute the absolute value of
31 the argument ''j'' of the appropriate integer type for
32 the function.
33 !!RETURN VALUE
34
35
36 Returns the absolute value of the integer argument, of the
37 appropriate integer type for the function.
38 !!CONFORMING TO
39
40
41 SVID 3, POSIX.1, BSD 4.3, ISO/IEC 9899. POSIX.1 (1996
42 edition) only requires the __abs()__ function. ISO/IEC
43 9899:1990 (C89) only includes the __abs()__ and
44 __labs()__ functions; the functions __llabs()__ and
45 __imaxabs()__ were added in C99.
46 !!NOTES
47
48
49 Trying to take the absolute value of the most negative
50 integer is not defined.
51
52
53 The __llabs()__ function is included in glibc since
54 version 2.0, but is not in libc5 or libc4. The
55 __imaxabs()__ function is included in glibc since version
56 2.1.1.
57
58
59 For __llabs()__ to be declared, it may be necessary to
60 define ___ISOC99_SOURCE__ or ___ISOC9X_SOURCE__
61 (depending on the version of glibc) before including any
62 standard headers.
63
64
65 GCC handles __abs()__ and __labs()__ as builtin
66 functions. GCC 3.0 also handles __llabs()__ and
67 __imaxabs()__ as builtins.
68 !!SEE ALSO
69
70
71 ceil(3), floor(3), fabs(3),
72 rint(3)
73 ----
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