NAME

nextafter

SYNOPSIS

#include <math.h>

double
nextafter(double x, double y);

long double
nextafterl(long double x, long double y);

float
nextafterf(float x, float y);

DESCRIPTION

The nextafter() functions return the next machine representable number from x in direction y.

SPECIAL VALUES

nextafter(x, y) raises the "overflow" and "inexact" floating-point exceptions for x finite and the function value infinite.

nextafter(x, y) raises the "underflow" and "inexact" floating-point exceptions for the function value subnormal or zero and x not equal to y.

VECTOR OPERATIONS

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

#include <Accelerate/Accelerate.h>

vFloat vnextafterf(vFloat x, vFloat y);
void vvnextafterf(float *z, const float *y, const float *x, const int *n);
void vvnextafter(double *z, const double *y, const double *x, const int *n);

STANDARDS