{

std::vector<int> items = {1,2,3,4};

for (int i = 0; i < items.size(); i++)

{

std::cout << items[i] << std::endl;

}

for (auto it = items.begin(); it != items.end(); it++)

{

std::cout << *it << std::endl;

}

for (auto &i : items)

{

std::cout << i << std::endl;

}