LROUND(3) Linux Programmer's Manual LROUND(3)
lround, lroundf, lroundl, llround, llroundf, llroundl - round to near-
est integer, away from zero
long int lround(double x);
long int lroundf(float x);
long int lroundl(long double x);
long long int llround(double x);
long long int llroundf(float x);
long long int llroundl(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
These functions round their argument to the nearest integer value,
rounding away from zero, regardless of the current rounding direction.
If x is infinite or NaN, or if the rounded value is outside the range
of the return type, the numeric result is unspecified. A domain error
may occur if the magnitude of x is too large.
The rounded integer value. Note that unlike round(3), ceil(3), etc.,
the return type of these functions differs from that of their argu-
EDOM The magnitude of x is too large and (math_errhandling &
MATH_ERRNO) is non-zero.
ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)
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