NAME

fabs, fabsf, fabsl — floating-point absolute value functions

SYNOPSIS

Math Library (libm, -lm)
#include <math.h>

double
fabs(double x);

float
fabsf(float x);

long double
fabsl(long double x);

DESCRIPTION

The fabs() function computes the absolute value of a floating-point number x. The fabsf() function is a single precision version of fabs(). The fabsl() function is an extended precision version of fabs().

RETURN VALUES

The fabs(), fabsf() and fabsl() functions return the absolute value of x.

SEE ALSO

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

STANDARDS

The fabs() function conforms to ANSI X3.159-1989 (“ANSI C89”).

HISTORY

An fabs() function first appeared in Version 6 AT&T UNIX.