plucky (3) lrint.3.gz

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(), llrintf(), llrintl()                   │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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)