#include <math.h>long long int llroundf(float arg);long long int llround(double arg); long long int llroundl(long double arg);
llround( ), llroundf( ), and llroundl( ) were added by C99.
The llround( ) family of functions returns the value of arg rounded to the nearest long long integer. Values precisely between two values, such as 3.5, are rounded up.
Related functions are lround( ) and round( ).