LROUND(3) manual page
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lround, lroundf, lroundl, llround, llroundf,
llroundl - round to nearest integer, away from zero
#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
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 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.
The lround(), lroundf(), lroundl(), llround(), llroundf(),
and llroundl() functions are thread-safe.
C99, POSIX.1-2001.
ceil(3)
, floor(3)
, lrint(3)
, nearbyint(3)
, rint(3)
, round(3)
This
page is part of release 3.78 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 http://www.kernel.org/doc/man-pages/.
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