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

int main()
{
    string s1("Have a nice day.");

    //  cout << s1.begin() << endl;  ERROR

    cout << *s1.begin() << endl;
    cout << *(s1.begin()+2) << endl;

    cout << '/' << *s1.end() << '/' << endl;    // Runtime error on MSVC++ 2017
    cout << *(s1.end()-4) << endl;

    cout << "*s1.rbegin()=" << *s1.rbegin() << '/' << endl;
    cout << "*(s1.rbegin()+1)=" << *(s1.rbegin()+1) << '/' << endl;
    cout << "*(s1.rbegin()-1)=" << *(s1.rbegin()-1) << '/' << endl;
    cout << endl;
    cout << "*s1.rend()=" << *s1.rend() << '/' << endl;
    cout << "*(s1.rend()+1)=" << *(s1.rend()+1) << '/' << endl;
    cout << "*(s1.rend()-1)=" << *(s1.rend()-1) << '/' << endl;
    cout << endl;

    *s1.begin() = 'Z';
    cout << s1 << endl;

    // *s1.cbegin() = 'Z';     ERROR

    for (string::const_iterator it = s1.begin(); it != s1.end(); ++it)
        cout << *it << '/';
    cout << endl;
    for (string::const_reverse_iterator it = s1.rbegin(); it != s1.rend(); ++it)
        cout << *it << '/';
}