Can anyone explain this program? [closed]

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int array[2][2] = {0, 1, 2, 3};
int i;
int sum = 0;

for (i =0; i < 4; ++i)
{

    int x, y;

    x = i % 2;

    if (x)
    {
        y = 0;
        }
    else
    {
        y = 1;
        }
    sum += array[x][y];
}

printf("%d\n", sum);

---

It's short enough that you could walk through it yourself (since this is homework) and run each line yourself on paper. If there is any line that you can't figure out, ask a more specific question. Just use pencil, make a box to show the values of x, y, i, sum and all 4 elements of the array. Then walk through changing the values in those boxes as you examine lines of code and you will see exactly what's happening. One thing you should know is that "if (x)" will treat x as true when it is 1.