rintl

       est integer

SYNOPSIS
       #include <math.h>

       double nearbyint(double x);
       float nearbyintf(float x);
       long double nearbyintl(long double x);

       double rint(double x);
       float rintf(float x);
       long double rintl(long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       nearbyint(), nearbyintf(), nearbyintl():
           _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L ||
           _ISOC99_SOURCE;
           or cc -std=c99
       rint():
           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
           _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
           _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99
       rintf(), rintl():
           _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99

DESCRIPTION
       The nearbyint() functions round their argument to an integer  value  in
       floating-point  format,  using the current rounding direction (see fes-
       etround(3)) and without raising the inexact exception.

       The rint() functions do the same, but will raise the inexact  exception
       (FE_INEXACT,  checkable via fetestexcept(3)) when the result differs in
       value from the argument.

RETURN VALUE
       These functions return the rounded integer value.

       If x is integral, +0, -0, NaN, or infinite, x itself is returned.

ERRORS
       No errors occur.  POSIX.1-2001 documents a range error  for  overflows,
       but see NOTES.

CONFORMING TO
       C99, POSIX.1-2001.

NOTES
       SUSv2  and  POSIX.1-2001  contain  text about overflow (which might set
       ceil(3), floor(3), lrint(3), round(3), trunc(3)

COLOPHON
       This  page  is  part of release 3.35 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.



                                  2010-09-20                           RINT(3)
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