Ranged based for 루프와 vector

int main () {
    
    std::vector<int> v = { 0, 1, 2, 3, 4, 5 };

    for (const int& i : v) // access by const reference
        std::cout << i << ' ';
    std::cout << '\n';

    for (auto i : v) // access by value, the type of i is int
        std::cout << i << ' ';
    std::cout << '\n';

    return 0;
}