LROUND
Section: Linux Programmer's Manual (3)
Updated: 20130826
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NAME
lround, lroundf, lroundl, llround, llroundf, llroundl  round to
nearest 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 floatingpoint 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 threadsafe.
CONFORMING TO
C99, POSIX.12001.
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
manpages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/manpages/.
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 RETURN VALUE

 ERRORS

 VERSIONS

 ATTRIBUTES

 Multithreading (see pthreads(7))

 CONFORMING TO

 SEE ALSO

 COLOPHON

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Time: 19:18:10 GMT, January 18, 2018