Name
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); |
long
double rintl( |
long double |
x); |
![[Note]](../stylesheet/note.png) |
Note |
|
Link with −lm.
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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
SUSv2 and POSIX.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 numbers the maximum value of the exponent is
128 (resp. 1024), and the number of mantissa bits is 24
(resp. 53).)
SEE ALSO
ceil(3), floor(3), lrint(3), nearbyint(3), round(3), trunc(3)
Copyright 2001 Andries Brouwer <aeb@cwi.nl>.
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