nearbyint, nearbyintf, nearbyintl, rint, rintf, rintl -
round to nearest 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 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 argu
ment.
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 man
tissa 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 func
tions are from C99.
SEE ALSO
ceil(3), floor(3), lrint(3), nearbyint(3), round(3),
trunc(3)
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