NAME    [Toc]    [Back]

       nearbyint,  nearbyintf, nearbyintl, rint, rintf, rintl - round to nearest
 integer

SYNOPSIS    [Toc]    [Back]

       #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);

DESCRIPTION    [Toc]    [Back]

       The nearbyint functions round their argument to	an  integer  value  in
       floating point format, using the current rounding direction and without
       raising the inexact exception.

       The rint functions do the same, but will raise  the  inexact  exception
       when the result differs in value from the argument.

RETURN VALUE    [Toc]    [Back]

       The  rounded  integer  value. If x is integral or infinite, x itself is
       returned.

ERRORS    [Toc]    [Back]

       No errors other than EDOM and ERANGE can occur.	If x is NaN, then  NaN
       is returned and errno may be set to EDOM.

NOTES    [Toc]    [Back]

       The SUSv2 and Austin draft contain text about overflow (which might set
       errno to ERANGE, or raise an exception).  In practice, the result  cannot
  overflow  on  any current machine, so this error-handling stuff is
       just nonsense.  (More precisely, overflow can happen only when the maximum
 value of the exponent is smaller than the number of mantissa bits.
       For the IEEE-754 standard 32-bit and 64-bit floating point numbers  the
       maximum	value  of  the exponent is 128 (resp. 1024), and the number of
       mantissa bits is 24 (resp. 53).)

CONFORMING TO    [Toc]    [Back]

       The rint() function conforms to BSD 4.3.  The other functions are  from
       C99.

SEE ALSO    [Toc]    [Back]

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



				  2001-05-31			       RINT(3)