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LROUND(3) Library Functions Manual LROUND(3)

llround, llroundf, llroundl, lround, lroundf, lroundl
convert to nearest integral value

#include <math.h>

long long
llround(double x);

long long
llroundf(float x);

long long
llroundl(long double x);

long
lround(double x);

long
lroundf(float x);

long
lroundl(long double x);

The lround() function returns the integer nearest to its argument x, rounding away from zero in halfway cases. If the rounded result is too large to be represented as a long value, an invalid exception is raised and the return value is undefined. Otherwise, if x is not an integer, lround() may raise an inexact exception. When the rounded result is representable as a long, the expression lround(x) is equivalent to (long)round(x) (although the former may be more efficient).

The llround(), llroundf(), llroundl(), lroundf() and lroundl() functions differ from lround() only in their input and output types.

lrint(3), rint(3)

The llround(), llroundf(), llroundl(), lround(), lroundf(), and lroundl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
August 14, 2013 OpenBSD-current