# fabsf(3) [opendarwin man page]

```FABS(3) 						   BSD Library Functions Manual 						   FABS(3)

NAME
fabs -- floating-point absolute value function

SYNOPSIS
#include <math.h>

double
fabs(double x);

float
fabsf(float x);

DESCRIPTION
The fabs() and fabsf() functions compute the absolute value of a floating-point number x.

SPECIAL VALUES
fabs(+-0) returns 0.

fabs(+-infinity) returns +infinity.

abs(3), ceil(3), floor(3), rint(3), ieee(3), math(3)

STANDARDS
The fabs() and fabsf() functions conform to ISO/IEC 9899:1999(E).

BSD								 November 20, 2002							       BSD```

## Check Out this Related Man Page

```FABS(3) 						     Linux Programmer's Manual							   FABS(3)

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);

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

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
The fabs(), fabsf(), and fabsl() functions are thread-safe.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.