C/math.h/llround
llround: returns the value of arg rounded to the nearest long long integer
//Declaratin: long long int llroundf(float arg);
long long int llround(double arg);
long long int llroundl(long double arg);
//Values precisely between two values, such as 3.5, are rounded up.
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%l", llround (1.2));
return 0;
}