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NEXTAFTER(3) Library Functions Manual NEXTAFTER(3)

nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl
next representable value

#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);

These functions return the next machine representable number from x in direction y. If x equals y, these functions return y.

nearbyint(3)

IEEE Std 754-1985

The nextafter and nextafterf functions appeared in 4.3BSD and NetBSD 1.1, respectively.
June 5, 2013 OpenBSD-current