#include<stdio.h>
#include<time.h>
int main(){
        clock_t start, end;
        double tp;
        int i;
        long cyc=1000000000;
        start = clock();
        printf("Start: %d \n",start);
        for(i=0; i<cyc; i++){}
        end = clock();
        printf("End: %d \n",end);
        tp=(end-start);
        printf("CLOCKS_PER_SECOND: %d \n",CLOCKS_PER_SEC);
        printf("Tempo trascorso: %f sec. \n",tp/CLOCKS_PER_SEC);
        return 0;
}