# nextafter(3) [osx man page]

```NEXTAFTER(3)						   BSD Library Functions Manual 					      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);

math(3)

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

BSD								 December 11, 2006							       BSD```

## Check Out this Related Man Page

```NEXTAFTER(3)							libc math functions						      NEXTAFTER(3)

NAME
nextafter, nexttoward - floating point number manipulation

SYNOPSIS
#include <math.h>

double nextafter(double x, double y);
float nextafterf(float x, float y);
long double nextafterl(long double x, long double y);

double nexttoward(double x, long double y);
float nexttowardf(float x, long double y);
long double nexttowardl(long double x, long double y);

DESCRIPTION
The  nextafter()  functions return the next representable neighbor of x in the direction towards y.  The size of the step between x and the
result depends on the type of the result.  If x = y the function simply returns y.  If either value is NaN, then NaN is	returned.   Other-
wise a value corresponding to the value of the least significant bit in the mantissa is added or subtracted, depending on the direction.

The nexttoward() functions do the same as the nextafter() functions, except that they have a long double second argument.

These functions will signal overflow or underflow if the result goes outside of the range of normalized numbers.

CONFORMING TO
C99. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).