ABS(3) Library Functions Manual ABS(3)NAME
abs - integer absolute value
Abs returns the absolute value of its integer operand.
SEE ALSO floor(3M) for fabs
Applying the abs function to the most negative integer generates a result which is the most negative integer. That is,
returns 0x80000000 as a result.
7th Edition May 15, 1985 ABS(3)
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ABS(3) Linux Programmer's Manual ABS(3)NAME
abs, labs, llabs, imaxabs - compute the absolute value of an integer
int abs(int j);
long int labs(long int j);
long long int llabs(long long int j);
intmax_t imaxabs(intmax_t j);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
llabs(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
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.
Returns the absolute value of the integer argument, of the appropriate integer type for the function.
SVr4, POSIX.1-2001, 4.3BSD, C99. C89 only includes the abs() and labs() functions; the functions llabs() and imaxabs() were added in C99.
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 built-in functions. GCC 3.0 also handles llabs() and imaxabs() as built-ins.
SEE ALSO cabs(3), ceil(3), fabs(3), floor(3), rint(3)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2007-07-26 ABS(3)
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