fabs
Section: C Library Functions (3)
Updated: 2023-02-05
Index
Return to Main Contents
NAME
fabs, fabsf, fabsl - absolute value of floating-point number
LIBRARY
Math library
(libm, -lm)
SYNOPSIS
#include <math.h>
double fabs(double x);
float fabsf(float x);
long double fabsl(long double x);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
fabsf(),
fabsl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
These 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.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
fabs(),
fabsf(),
fabsl()
| Thread safety | MT-Safe
|
STANDARDS
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning
double
also conforms to
SVr4, 4.3BSD.
SEE ALSO
abs(3),
cabs(3),
ceil(3),
floor(3),
labs(3),
rint(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- SEE ALSO
-
This document was created by
man2html,
using the manual pages.
Time: 18:55:19 GMT, April 18, 2024