nextafter

   Returns the next machine-representable number following x in the
   direction of y.

   This function is supported on OpenVMS Integrity servers and
   Alpha only.

   Format

     #include  <math.h>

     double nextafter  (double x, double y);

     float nextafterf  (float x, float y);

     long double nextafterl  (long double x, long double y);
 

Additional information available:

Arguments       Description     Return_Values