Интерактивная система просмотра системных руководств (man-ов) fabs (3) fabs ( Solaris man: Библиотечные вызовы ) fabs ( FreeBSD man: Библиотечные вызовы ) fabs ( Русские man: Библиотечные вызовы ) >> fabs ( Linux man: Библиотечные вызовы ) fabs ( POSIX man: Библиотечные вызовы )
NAME
fabs, fabsf, fabsl - absolute value of floating-point number
SYNOPSIS
#include <math.h >
double fabs(double x );
float fabsf(float x );
long double fabsl(long double x );
Link with -lm .
Feature Test Macro Requirements for glibc (see
feature_test_macros
fabsf (),
fabsl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or
cc -std=c99
DESCRIPTION
The
fabs ()
functions return the absolute value of the floating-point
number x .
RETURN VALUE
These functions return the absolute value of
x .
If
x
is a NaN, a NaN is returned.
If
x
is -0, +0 is returned.
If
x
is negative infinity or positive infinity, positive infinity is returned.
ERRORS
No errors occur.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
abs cabs ceil floor labs rint
COLOPHON
This page is part of release 3.14 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/.
Index
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO
COLOPHON
