LRINT(3) Linux Programmer's Manual LRINT(3)
lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest integer
long int lrint(double x);
long int lrintf(float x);
long int lrintl(long double x);
long long int llrint(double x);
long long int llrintf(float x);
long long int llrintl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
All functions shown above: _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
These functions round their argument to the nearest integer value, using the current
rounding direction (see fesetround(3)).
Note that unlike rint(3), etc., the return type of these functions differs from that of
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 first appeared in glibc in version 2.1.
ceil(3), floor(3), lround(3), nearbyint(3), rint(3), round(3)
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