cpp/choices.cpp at main · chuckbruno/cpp · GitHub

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#include <iostream>
#include <vector>
#include <array>

int main()
{
    using namespace std;
    double a1[4] = {1.2, 2.4, 3.6,  4.8};

    vector<double> a2(4);

    a2[0] = 1.0 / 3.0;
    a2[1] = 1.0 / 5.0;
    a2[2] = 1.0 / 7.0;
    a2[3] = 1.0 / 9.0;

    array<double, 4> a3 = {3.14, 2.72, 1.62, 1.41};
    array<double, 4> a4;

    a4 = a3;

    cout << "a1[2]: " << a1[2] << " at " << &a1[2] << endl;
    cout << "a2[2]: " << a2[2] << " at " << &a2[2] << endl;
    cout << "a3[2]: " << a3[2] << " at " << &a3[2] << endl;
    cout << "a4[2]: " << a4[2] << " at " << &a4[2] << endl;

    a1[-2] = 20.2;

    cout << "a1[-2]:" << a1[-2] << " at " << &a1[-2] << endl;
    cout << "a3[2]: " << a3[2] << " at " << &a3[2] << endl;
    cout << "a4[2]: " << a4[2] << " at " << &a4[2] << endl;
}