nearbyint, nearbyintf, nearbyintl, rint, rintf, rintl — round to nearest integer
#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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Note |
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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.
No errors other than EDOM and ERANGE can occur. If
x
is NaN, then NaN is
returned and errno
may be set to
EDOM.
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).)
ceil(3), floor(3), lrint(3), nearbyint(3), round(3), trunc(3)
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