sysy/functional_c/sy/34_arr_expr_len.sy

#define N -1

int arr[N + 2 * 4 - 99 / 99] = { 1, 2, 33, 4, 5, 6 };

int main()
{
    int i = 0, sum = 0;
    while (i < 6) {
        sum = sum + arr[i];
        i = i + 1;
    }
    return sum;
}