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RedHat 9 (Linux i386) - man page for roundf (redhat section 3)

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 maximum value of the  expo-
       nent is 128 (resp. 1024), and the number of mantissa 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)


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