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.\" Copyright 2001 Andries Brouwer <aeb@cwi.nl>.
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.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH LROUND 3 2017-09-15 "" "Linux Programmer's Manual"
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.SH NAME
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lround, lroundf, lroundl, llround, llroundf, llroundl \- round to
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nearest integer
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.SH SYNOPSIS
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.nf
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.B #include <math.h>
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.PP
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.BI "long int lround(double " x );
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.BI "long int lroundf(float " x );
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.BI "long int lroundl(long double " x );
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.PP
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.BI "long long int llround(double " x );
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.BI "long long int llroundf(float " x );
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.BI "long long int llroundl(long double " x );
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.fi
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.PP
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Link with \fI\-lm\fP.
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.PP
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.PP
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.ad l
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All functions shown above:
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.RS 4
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_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
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.RE
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.ad
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.SH DESCRIPTION
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These functions round their argument to the nearest integer value,
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rounding halfway cases away from zero,
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regardless of the current rounding direction (see
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.BR fenv (3)).
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.PP
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Note that unlike the
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.BR round (3)
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and
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.BR ceil (3),
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functions, the return type of these functions differs from
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that of their arguments.
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.SH RETURN VALUE
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These functions return the rounded integer value.
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.PP
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If
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.I x
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is a NaN or an infinity,
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or the rounded value is too large to be stored in a
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.I long
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.RI ( "long long"
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in the case of the
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.B ll*
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functions),
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then a domain error occurs, and the return value is unspecified.
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.\" The return value is -(LONG_MAX - 1) or -(LLONG_MAX -1)
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.SH ERRORS
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See
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.BR math_error (7)
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for information on how to determine whether an error has occurred
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when calling these functions.
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.PP
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The following errors can occur:
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.TP
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Domain error: \fIx\fP is a NaN or infinite, or the rounded value is too large
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.\" .I errno
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.\" is set to
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.\" .BR EDOM .
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An invalid floating-point exception
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.RB ( FE_INVALID )
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is raised.
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.PP
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These functions do not set
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.IR errno .
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.\" FIXME . Is it intentional that these functions do not set errno?
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.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6797
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.SH VERSIONS
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These functions first appeared in glibc in version 2.1.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lbw33 lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR lround (),
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.BR lroundf (),
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.BR lroundl (),
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.br
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.BR llround (),
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.BR llroundf (),
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.BR llroundl ()
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T} Thread safety MT-Safe
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.TE
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.SH CONFORMING TO
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C99, POSIX.1-2001, POSIX.1-2008.
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.SH SEE ALSO
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.BR ceil (3),
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.BR floor (3),
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.BR lrint (3),
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.BR nearbyint (3),
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.BR rint (3),
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.BR round (3)
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.SH COLOPHON
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This page is part of release 4.15 of the Linux
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.I man-pages
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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\%https://www.kernel.org/doc/man\-pages/.
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