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); |
double rint( |
double | x); |
float
rintf( |
float | x); |
long
double rintl( |
long double | x); |
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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.
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).)
COLOPHON
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright 2001 Andries Brouwer <aebcwi.nl>. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. |