FABS(3) manual page
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fabs, fabsf, fabsl - absolute value of
floating-point number
#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(7)
):
fabsf(), fabsl():
_BSD_SOURCE
|| _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
These functions return the absolute value of the
floating-point number x.
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.
No errors occur.
The fabs(),
fabsf(), and fabsl() functions are thread-safe.
C99, POSIX.1-2001.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
abs(3)
,
cabs(3)
, ceil(3)
, floor(3)
, labs(3)
, rint(3)
This page is part
of release 3.78 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/.
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