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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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LROUND(3) Linux Programmer's Manual LROUND(3)
lround, lroundf, lroundl, llround, llroundf, llroundl - round to
nearest integer
#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
These functions round their argument to the nearest integer value,
rounding halfway cases 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.
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.
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.
These functions first appeared in glibc in version 2.1.
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() │ │ │
└──────────────────────────────────┴───────────────┴─────────┘
C99, POSIX.1-2001, POSIX.1-2008.
ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)
This page is part of release 4.15 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/.
2017-09-15 LROUND(3)
Pages that refer to this page: lrint(3), round(3)
Copyright and license for this manual page
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