Section: Linux Programmer's Manual (3) Updated: 2010-09-20 Local index
lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest integer
math.h> long int lrint(double x );
long int lrintf(float x );
long int lrintl(long double x );
long long int llrint(double x );
long long int llrintf(float x );
long long int llrintl(long double x );
Feature Test Macro Requirements for glibc (see
All functions shown above:
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
These functions round their argument to the nearest integer value,
using the current rounding direction (see
Note that unlike
etc., the return type of these functions differs from
that of their arguments.
These functions return the rounded integer value.
is a NaN or an infinity,
or the rounded value is too large to be stored in a
( long long
in the case of the
then a domain error occurs, and the return value is unspecified.
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
These functions do not set
These functions first appeared in glibc in version 2.1.
This page is part of release 3.27 of the Linux
A description of the project,
and information about reporting bugs,
can be found at
This document was created by
using the manual pages.
Time: 21:49:29 GMT, April 16, 2011