lrint(3)                   Library Functions Manual                   lrint(3)

NAME
       lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest
       integer

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,
       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.

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.

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |lrint (), lrintf (), lrintl (), llrint (),  | Thread safety | MT-Safe |
       |llrintf (), llrintl ()                      |               |         |
       +--------------------------------------------+---------------+---------+
STANDARDS
       C11, POSIX.1-2008.

HISTORY
       glibc 2.1.  C99, POSIX.1-2001.

SEE ALSO
       ceil(3), floor(3), lround(3), nearbyint(3), rint(3), round(3)

Linux man-pages 6.7               2023-10-31                          lrint(3)