test_Using.cpp

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#include <iostream>
#include <vector>
using namespace std;

int main()
{
    vector<double> a{3, 4, 5};
    auto b = a;

    for (int i=0; i < b.size(); i++) {
        cout << i << endl;
    }

    &b[0]
    b.begin()

    for (std::vector<double>::iterator i; i < i != b.end(), i=i.next())

    for (auto b_el : b) {
        cout << b_el << endl;
    }

    {
        using ulong = unsigned long;
        ulong a = 45;
        cout << a << endl;
    }
    return 0;
}