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NEXTAFTER(3)			    Linux Programmer's Manual			     NEXTAFTER(3)

NAME
       nextafter,  nextafterf,	nextafterl, nexttoward, nexttowardf, nexttowardl - 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);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       nextafter(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or
       cc -std=c99
       nextafterf(), nextafterl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
       _ISOC99_SOURCE; or cc -std=c99
       nexttoward(), nexttowardf(), nexttowardl(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE;
       cc -std=c99

DESCRIPTION
       The  nextafter()  functions return the next representable floating-point value following x
       in the direction of y.  If y is less than x, these functions will return the largest  rep-
       resentable number less than x.

       If x equals y, the functions return y.

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

RETURN VALUE
       On success, these functions return the next representable floating-point value after x  in
       the direction of y.

       If x equals y, then y (cast to the same type as x) is returned.

       If x or y is a NaN, a NaN is returned.

       If  x  is  finite,  and the result would overflow, a range error occurs, and the functions
       return HUGE_VAL, HUGE_VALF, or HUGE_VALL,  respectively,  with  the  correct  mathematical
       sign.

       If  x  is  not  equal  to  y, and the correct function result would be subnormal, zero, or
       underflow, a range error occurs, and either the correct value (if it can be  represented),
       or 0.0, is returned.

ERRORS
       See  math_error(7)  for information on how to determine whether an error has occurred when
       calling these functions.

       The following errors can occur:

       Range error: result overflow
	      An overflow floating-point exception (FE_OVERFLOW) is raised.

       Range error: result is subnormal or underflows
	      An underflow floating-point exception (FE_UNDERFLOW) is raised.

       These functions do not set errno.

CONFORMING TO
       C99, POSIX.1-2001.  This function is defined in IEC 559 (and the appendix with recommended
       functions in IEEE 754/IEEE 854).

BUGS
       In glibc version 2.5 and earlier, these functions do not raise an underflow floating-point
       (FE_UNDERFLOW) exception when an underflow occurs.

SEE ALSO
       nearbyint(3)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A  description  of  the
       project,   and	information  about  reporting  bugs,  can  be  found  at  http://www.ker-
       nel.org/doc/man-pages/.

GNU					    2009-12-05				     NEXTAFTER(3)
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