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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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lrint(3) Library Functions Manual lrint(3)
lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest
integer
Math library (libm, -lm)
#include <math.h>
long lrint(double x);
long lrintf(float x);
long lrintl(long double x);
long long llrint(double x);
long long llrintf(float x);
long long llrintl(long double x);
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,
using the current rounding direction (see fesetround(3)).
Note that unlike the rint(3) family of 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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ lrint(), lrintf(), lrintl(), │ Thread safety │ MT-Safe │
│ llrint(), llrintf(), llrintl() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
glibc 2.1. C99, POSIX.1-2001.
ceil(3), floor(3), lround(3), nearbyint(3), rint(3), round(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.10.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-02-02. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.10 2024-07-23 lrint(3)
Pages that refer to this page: ceil(3), floor(3), lround(3), rint(3), roundup(3), trunc(3)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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