#include<stdio.h>
#include<time.h>

int main(){
        clock_t start, end;
        time_t t0, t1;
        double tp;
        int i;
        long cyc=1000000000;

        printf("CLOCKS_PER_SECOND: %d \n",CLOCKS_PER_SEC);
        start = clock(); time(&t0);
        for(i=0; i<cyc; i++){}
        time(&t1); end = clock();
        printf("Start, end clock: %d, %d \n",start, end);
        printf("Start, end time: %d, %d \n",t0,t1);
        tp=(end-start);
        printf("Tempo trascorso: %f; cpu usata: %f (in sec.)\n",difftime(t1,t0), tp/CLOCKS_PER_SEC);

        printf("CLOCKS_PER_SECOND: %d \n",CLOCKS_PER_SEC);
        start = clock(); time(&t0);
        sleep(10);
        time(&t1); end = clock();
        printf("Start, end clock: %d, %d \n",start, end);
        printf("Start, end time: %d, %d \n",t0,t1);
        tp=(end-start);
        printf("Tempo trascorso: %f; cpu usata: %f (in sec.)\n",difftime(t1,t0), tp/CLOCKS_PER_SEC);
                
        return 0;
}