lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest integer
Math library (
libm,
-lm)
#include <math.h>
long lrint(double x);
long lrintf(float x);
long lrintl(long double x);
long long llrint(double x);
long long llrintf(float x);
long long llrintl(long double x);
All functions shown above:
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
These functions round their argument to the nearest integer value, using the
current rounding direction (see
fesetround(3)).
Note that unlike the
rint(3) family of functions, the return type of
these functions differs from that of their arguments.
These functions return the rounded integer value.
If
x is a NaN or an infinity, or the rounded value is too large to be
stored in a
long (
long long in the case of the
ll*
functions), then a domain error occurs, and the return value is unspecified.
See
math_error(7) for information on how to determine whether an error
has occurred when calling these functions.
The following errors can occur:
- Domain error: x is a NaN or infinite, or the rounded
value is too large
- An invalid floating-point exception (FE_INVALID) is
raised.
These functions do not set
errno.
These functions were added in glibc 2.1.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
lrint (), lrintf (), lrintl (), llrint (), llrintf (), llrintl () |
Thread safety |
MT-Safe |
C99, POSIX.1-2001, POSIX.1-2008.
ceil(3),
floor(3),
lround(3),
nearbyint(3),
rint(3),
round(3)