lrint(3) Library Functions Manual lrint(3)
NAME
lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest in-
teger
LIBRARY
Math library (libm, -lm)
SYNOPSIS
#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
DESCRIPTION
These functions round their argument to the nearest integer value, us-
ing 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.
RETURN VALUE
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.
ERRORS
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.
VERSIONS
These functions were added in glibc 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│lrint(), lrintf(), lrintl(), llrint(), │ Thread safety │ MT-Safe │
│llrintf(), llrintl() │ │ │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO
ceil(3), floor(3), lround(3), nearbyint(3), rint(3), round(3)
Linux man-pages 6.03 2022-12-15 lrint(3)
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