NAME

fabs — floating-point absolute value function

SYNOPSIS

#include <math.h>

double
fabs(double x);

long double
fabsl(long double x);

float
fabsf(float x);

DESCRIPTION

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

SPECIAL VALUES

fabs(±0) returns 0.

fabs(±infinity) returns +infinity.

VECTOR OPERATIONS

If you need to apply the fabs() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may give significantly better performance:

#include <Accelerate/Accelerate.h>

vFloat vfabsf(vFloat x);
void vvfabsf( float *y, const float *x, const int *n);
void vvfabs(double *y, const double *x, const int *n);

SEE ALSO

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

STANDARDS

The fabs() functions conform to ISO/IEC 9899:2011.