C Programming on the IBM PC (C Programmers Reference Guide Series)

nextafter

#include <math.h>float nextafterf(float from, float towards); double nextafter(double from, double towards); long double nextafterl(long double from, long double towards);

nextafter( ), nextafterf( ), and nextafterl( ) were defined by C99.

The nextafter( ) family of functions returns the next value after from that is closer to towards.

A related function is nexttoward( ).