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:
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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 the round(3) and ceil(3), functions, 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
       For  an	explanation  of	 the  terms  used   in	 this	section,   see
       attributes(7).

       +----------------------------------+---------------+---------+
       |Interface			  | Attribute	  | Value   |
       +----------------------------------+---------------+---------+
       |lround(), lroundf(), lroundl(),	  | Thread safety | MT-Safe |
       |llround(), llroundf(), llroundl() |		  |	    |
       +----------------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.

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

COLOPHON
       This  page  is  part of release 4.10 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/.



				  2016-03-15			     LROUND(3)