RedHat 9 (Linux i386) - man page for nexttowardf (redhat section 3)

NEXTAFTER(3)			       libc math functions			     NEXTAFTER(3)

NAME
       nextafter, nexttoward - floating point number manipulation

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
       The  nextafter()  functions  return  the next representable neighbor of x in the direction
       towards y.  The size of the step between x and the result  depends  on  the  type  of  the
       result.	 If  x	=  y  the function simply returns y.  If either value is NaN, then NaN is
       returned.  Otherwise a value corresponding to the value of the least  significant  bit  in
       the mantissa is added or subtracted, depending on the direction.

       The nexttoward() functions do the same as the nextafter() functions, except that they have
       a long double second argument.

       These functions will signal overflow or underflow if the result goes outside of the  range
       of normalized numbers.

CONFORMING TO
       C99.  This  function is defined in IEC 559 (and the appendix with recommended functions in
       IEEE 754/IEEE 854).

SEE ALSO
       nearbyint(3)

GNU					    2002-08-10				     NEXTAFTER(3)