lround, lroundf, lroundl - Round off to nearest whole number

Definition	#include <math.h> long int lround(double x); long int lroundf (float x); long int lroundl (long double x); Each of the functions returns the whole number nearest to x, represented as a number of type long int. The return value is independent of the defined rounding mode. If the difference between x and the rounded result is exactly 0.5, the larger whole number is returned.
Return val.	integer	represented as a number of type long long int if successful.
	undefined	in the event of an overflow or underflow, errno is set to ERANGE to indicate the error.
See also	abs, ceil, floor, llrint, llround, lrint, rint, round