NEXTAFTER(3)

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);

SEE ALSO
math(3)

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