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RINT(3) 		   Linux Programmers Manual		      RINT(3)

       nearbyint,  nearbyintf, nearbyintl, rint, rintf, rintl - round to near
       est integer


       double nearbyint(double x);
       float nearbyintf(float x);
       long double nearbyintl(long double x);

       double rint(double x);
       float rintf(float x);
       long double rintl(long double x);

       Link with -lm.

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

       nearbyint(), nearbyintf(), nearbyintl(): _XOPEN_SOURCE >= 600 ||
       _ISOC99_SOURCE; or cc -std=c99
       rint(), rintf(), rintl(): _BSD_SOURCE || _SVID_SOURCE ||
       _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99

       The nearbyint() functions round their argument to an integer  value  in
       floating point format, using the current rounding direction and without
       raising the inexact exception.

       The rint() functions do the same, but will raise the inexact  exception
       when the result differs in value from the argument.

       The  rounded  integer value.  If x is integral or infinite, x itself is

       No errors other than EDOM and ERANGE can occur.	If x is NaN, then  NaN
       is returned and errno may be set to EDOM.


       SUSv2  and  POSIX.1-2001  contain  text about overflow (which might set
       errno to ERANGE, or raise an exception).  In practice, the result  can
       not  overflow  on  any current machine, so this error-handling stuff is
       just nonsense.  (More precisely, overflow can happen only when the max
       imum value of the exponent is smaller than the number of mantissa bits.
       For the IEEE-754 standard 32-bit and 64-bit floating point numbers  the
       maximum value of the exponent is 128 (respectively, 1024), and the num
       ber of mantissa bits is 24 (respectively, 53).)

       ceil(3), floor(3), lrint(3), round(3), trunc(3)

       This page is part of release 3.05 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

				  2007-07-26			       RINT(3)

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