NAME

nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl —

next representable value

LIBRARY

Math Library (libm, -lm)

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

These functions return the next machine representable number from x in direction y.

STANDARDS

The nextafter(), nextafterf(), nextafterl(), nexttoward(), nexttowardf(), and nexttowardl() routines conform to ISO/IEC 9899:1999 (“ISO C99”). They implement the Nextafter function recommended by IEEE Std 754-1985, with the extension that nextafter(+0.0, -0.0) returns -0.0, and nextafter(-0.0, +0.0) returns +0.0.

HISTORY

The nextafter() function appeared in 4.3BSD, and nextafterf() appeared in FreeBSD 2.0.