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)):

       _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


   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
   representable 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,
   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.


   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.


   For  an  explanation  of  the  terms  used   in   this   section,   see

   Interface                     Attribute      Value   
   nextafter(), nextafterf(),    Thread safety  MT-Safe 
   nextafterl(), nexttoward(),                          
   nexttowardf(), nexttowardl()                         


   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).


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




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