#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;
}

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