Manual Pages  — NEXTAFTER

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

LIBRARY SYNOPSIS DESCRIPTION SEE ALSO STANDARDS HISTORY

Math Library (libm, -lm)

#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.

The nextafter(), nextafterf(), nextafterl(), nexttoward(), nexttowardf(), and nexttowardl() routines conform to ISO/IEC 9899:1999 ("ISO C99"). They implement the Nextafter function recommended by -ieee754, with the extension that nextafter(+0.0, -0.0) returns -0.0, and nextafter(-0.0, +0.0) returns +0.0.

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