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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:
       _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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 the round(3) and ceil(3), 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   │
   ├──────────────────────────────────┼───────────────┼─────────┤
   │lround(), lroundf(), lroundl(),   │ Thread safety │ MT-Safe │
   │llround(), llroundf(), llroundl() │               │         │
   └──────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO

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

SEE ALSO

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

COLOPHON

   This  page  is  part of release 4.09 of the Linux man-pages project.  A
   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                         LROUND(3)



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