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

  /* Primjer za funkciju clock() = procesorsko vrijeme. */
 
double dsecnd (void) {
    return (double)( clock() ) / CLOCKS_PER_SEC;
}

int main(void)
{
    int i, j;
    double t1, t2, time;

    t1 = dsecnd();

    for (i = 1; i < 100000; ++i)
        for (j = 1; j < i; ++j)
            rand();

    t2 = dsecnd();

    time = t2 - t1;
    printf("%g\n", time);

    return 0;
}