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

NAME
       round, roundf, roundl - round to	nearest	integer, away from zero

SYNOPSIS
       #include	<math.h>

       double round(double x);
       float roundf(float x);
       long double roundl(long double x);

DESCRIPTION
       These functions round x to the nearest integer, but round halfway cases
       away from zero (regardless of the current rounding direction),  instead
       of to the nearest even integer like rint().

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
       POSIX  1003.1-2001  contains 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 max-
       imum  value of the exponent is 128 (resp. 1024),	and the	number of man-
       tissa bits is 24	(resp. 53).)

CONFORMING TO
       C99.

SEE ALSO
       ceil(3),	floor(3), lround(3), nearbyint(3), rint(3), trunc(3)

				  2001-05-31			      ROUND(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | CONFORMING TO | SEE ALSO

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