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

int main()
{
    int i, j;
    long t1, t2, t3;
    double r = 0;
  
  t1 = clock();

    for (i = 0; i < 10; ++i)
    {
        for (j = 0; j < 100000000; ++j)
        {
            r += cos(1);
        }
    }

    t1 = clock() - t1;
    printf("test1 = %f microseconds\n", 1e6f * (float)t1 / CLOCKS_PER_SEC);

    t2 = clock();

    for (i = 0; i < 100000000; ++i)
    {
        for (j = 0; j < 10; ++j)
        {
            r += cos(1);
        }
    }

    t2 = clock() - t2;
    printf("test2 = %f microseconds, debug: %f\n", 1e6f * (float)t2 / CLOCKS_PER_SEC, r);
  
    return 0;
}