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

NAME
       lround,	lroundf, lroundl, llround, llroundf, llroundl - round to near‐
       est integer, away from zero

SYNOPSIS
       #include <math.h>

       long int lround(double x);
       long int lroundf(float x);
       long int lroundl(long double x);

       long long int llround(double x);
       long long int llroundf(float x);
       long long int llroundl(long double x);

       Link with -lm.

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

       All functions shown above:
	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
	   _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

DESCRIPTION
       These  functions	 round	their  argument	 to the nearest integer value,
       rounding away from zero, regardless of the current  rounding  direction
       (see fenv(3)).

       Note  that  unlike  round(3),  ceil(3),	etc., the return type of these
       functions differs from that of their arguments.

RETURN VALUE
       These functions return the rounded integer value.

       If x is a NaN or an infinity, or the rounded value is too large	to  be
       stored  in  a  long (long long in the case of the ll* functions) then a
       domain error occurs, and the return value is unspecified.

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:

       Domain error: x is a NaN or infinite, or the rounded value is too large
	      An invalid floating-point exception (FE_INVALID) is raised.

       These functions do not set errno.

VERSIONS
       These functions first appeared in glibc in version 2.1.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The   lround(),	 lroundf(),   lroundl(),  llround(),  llroundf(),  and
       llroundl() functions are thread-safe.

CONFORMING TO
       C99, POSIX.1-2001.

SEE ALSO
       ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)

COLOPHON
       This page is part of release 3.54 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/.

				  2013-08-26			     LROUND(3)
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