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

int a[1000];
int b[1000];

void setAandB()
{
    int i = 0;
    for(i = 0; i < 1000; i++) {
        a[i] = 0;
        b[i] = i;
    }
}
void bar()
{
    int i = 0;
    while (i < 1000){
      a[i] += b[i++];
      a[i] += b[i++];
      a[i] += b[i++];
      a[i] += b[i++];
    }
}
void foo() {
    int i;
    for (i = 0; i < 1000; i++) {
        a[i] = a[i] + b[i];
    }
}

int main()
{
    // setAandB();
    clock_t tic = clock();
    bar(); //slower
    clock_t toc = clock();
    printf("Elapsed: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
    // setAandB();
    clock_t tic1 = clock();
    foo(); //faster
    clock_t toc1 = clock();
    printf("Elapsed: %f seconds\n", (double)(toc1 - tic1) / CLOCKS_PER_SEC);

    return 0;
}