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

int main(void)
{
    clock_t begin = clock();
    int a = 1 + 1;
    clock_t end = clock();
    double time_spent = (double)(end - begin) / CLOCKS_PER_SEC;
    printf("%f seconds\n", time_spent); // Returns something like 0.000002 seconds
}