lrint(3)

NAME

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

SYNOPSIS

   #include <math.h>

   long int lrint(double x);
   long int lrintf(float x);
   long int lrintl(long double x);

   long long int llrint(double x);
   long long int llrintf(float x);
   long long int llrintl(long double x);

   Link with -lm.

   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.

VERSIONS

   These functions first appeared in glibc in version 2.1.

ATTRIBUTES

   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() │               │         │
   └───────────────────────────────┴───────────────┴─────────┘

CONFORMING TO

   C99, POSIX.1-2001, POSIX.1-2008.

SEE ALSO

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

COLOPHON

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   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at
   https://www.kernel.org/doc/man-pages/.

                              2016-03-15                          LRINT(3)

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