nextafter man page on Archlinux

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

       nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl
       - floating-point number manipulation

       #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)):

	   _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99
       nextafterf(), nextafterl():
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99
       nexttoward(), nexttowardf(), nexttowardl():
	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
	   _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

       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.

       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.

       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.

   Multithreading (see pthreads(7))
       The  nextafter(),  nextafterf(),	 nextafterl(),	nexttoward(),  nextto‐
       wardf(), and nexttowardl() functions are thread-safe.

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

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


       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

GNU				  2013-09-02			  NEXTAFTER(3)

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