lrint(3) - Linux manual page (original) (raw)

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)](../man3/fesetround.3.html)).

   Note that unlike the [rint(3)](../man3/rint.3.html) 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)](../man7/math%5Ferror.7.html) 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](../man3/errno.3.html)_.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **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)](../man3/ceil.3.html), [floor(3)](../man3/floor.3.html), [lround(3)](../man3/lround.3.html), [nearbyint(3)](../man3/nearbyint.3.html), [rint(3)](../man3/rint.3.html), [round(3)](../man3/round.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 lrint(3)

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