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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():
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
	       || _XOPEN_SOURCE >= 500
	       || /* Since glibc 2.19: */ _DEFAULT_SOURCE
	       || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
       nextafterf(), nextafterl():
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
	       || /* Since glibc 2.19: */ _DEFAULT_SOURCE
	       || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
       nexttoward(), nexttowardf(), nexttowardl():
	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
	   _POSIX_C_SOURCE >= 200112L

DESCRIPTION
       The  nextafter(),  nextafterf(),	 and nextafterl() 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 repre‐
       sentable number less than x.

       If x equals y, the functions return y.

       The nexttoward(), nexttowardf(), and  nexttowardl()  functions  do  the
       same  as the corresponding 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,  respec‐
       tively, with the correct mathematical sign.

       If  x  is not equal to y, and the correct function result would be sub‐
       normal, zero, or underflow, a range error occurs, and either  the  cor‐
       rect 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.

ATTRIBUTES
       For  an	explanation  of	 the  terms  used   in	 this	section,   see
       attributes(7).

       ┌─────────────────────────────┬───────────────┬─────────┐
       │Interface		     │ Attribute     │ Value   │
       ├─────────────────────────────┼───────────────┼─────────┤
       │nextafter(), nextafterf(),   │ Thread safety │ MT-Safe │
       │nextafterl(), nexttoward(),  │		     │	       │
       │nexttowardf(), nexttowardl() │		     │	       │
       └─────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
       C99,  POSIX.1-2001,  POSIX.1-2008.  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 4.14 of the Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       https://www.kernel.org/doc/man-pages/.

GNU				  2017-09-15			  NEXTAFTER(3)
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