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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: _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or
       cc -std=c99

DESCRIPTION

       These  functions  round  their  argument  to the nearest integer value,
       using the current rounding direction (see fesetround(3)).

       Note that unlike rint(3), etc., 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.

CONFORMING TO

       C99, POSIX.1-2001.

SEE ALSO

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

COLOPHON

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

                                  2008-08-11