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LROUND(3)                  Linux Programmer's Manual                 LROUND(3)



NAME
       lround, lroundf, lroundl, llround, llroundf, llroundl - round to nearest integer, away from zero

SYNOPSIS
       #include <math.h>

       long int lround(double x);
       long int lroundf(float x);
       long int lroundl(long double x);

       long long int llround(double x);
       long long int llroundf(float x);
       long long int llroundl(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, rounding away from zero, regardless of the
       current rounding direction (see fenv(3)).

       Note that unlike round(3), ceil(3), etc., the return type of these functions differs from that of  their  argu-
       ments.

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  func-
       tions.

       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), lrint(3), nearbyint(3), rint(3), round(3)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



                                  2008-08-11                         LROUND(3)