int main()
{
    //stack allocation syntax 1
    string s = string("Sayounara");
    cout << s << endl;
    
    //stack allocation syntax 2
    string t("Goodbye");
    cout << t << endl;

    //heap allocation
    string *u = new string("Au revoir");
    cout << *u << endl;

    //stack allocation syntax 3
    string v;
    v.assign("Arrivederci");
    cout << v << endl;
    
    return 0;
}

Sayounara
Goodbye
Au revoir
Arrivederci