lrint(3) — Linux manual page

lrint(3)                Library Functions Manual                lrint(3)

NAME         top

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

LIBRARY         top

       Math library (libm, -lm)

SYNOPSIS         top

       #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         top

       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         top

       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         top

       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         top

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

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │lrint(), lrintf(), lrintl(),          │ Thread safety │ MT-Safe │
       │llrint(), llrintf(), llrintl()        │               │         │
       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       glibc 2.1.  C99, POSIX.1-2001.

SEE ALSO         top

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

Linux man-pages 6.04           2023-03-30                       lrint(3)

Pages that refer to this page: ceil(3),  floor(3),  lround(3),  rint(3),  roundup(3),  trunc(3)

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