How to get the time elapsed in C in milliseconds? (Windows)

Question

I\'ve searched in the Web but I\'ve only found a way for do it, but in this way it returns in seconds instead of milliseconds.

My code is:

#include 

        

Answer 1

The solution below seems OK to me. What do you think?

#include 
#include 

long timediff(clock_t t1, clock_t t2) {
    long elapsed;
    elapsed = ((double)t2 - t1) / CLOCKS_PER_SEC * 1000;
    return elapsed;
}

int main(void) {
    clock_t t1, t2;
    int i;
    float x = 2.7182;
    long elapsed;

    t1 = clock();
    for (i=0; i < 1000000; i++) {
           x = x * 3.1415; 
    }
    t2 = clock();

    elapsed = timediff(t1, t2);
    printf("elapsed: %ld ms\n", elapsed);


    return 0;
}

Reference: http://www.acm.uiuc.edu/webmonkeys/book/c_guide/2.15.html#clock