nearbyintl

RINT(3)			  Linux Programmer’s Manual		      RINT(3)



NAME
       nearbyint, nearbyintf, nearbyintl, rint, rintf, rintl - round to near-
       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);

DESCRIPTION
       The nearbyint functions round their argument to an  integer  value  in
       floating	 point format, using the current rounding direction and with-
       out 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
       The  rounded  integer value. If x is integral or infinite, x itself is
       returned.

ERRORS
       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
       SUSv2  and  POSIX 1003.1-2001 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 num-
       bers  the  maximum  value of the exponent is 128 (resp. 1024), and the
       number of mantissa bits is 24 (resp. 53).)

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

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



				  2001-05-31			      RINT(3)