View Source: nearbyint(3) - Waikato Linux Users Group

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RINT
!!!RINT
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
NOTES
CONFORMING TO
SEE ALSO
----
!!NAME


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


__#include
__ ''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 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


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


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


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)
----

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Last edited on Tuesday, June 4, 2002 12:24:29 am by "perry"

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