void do_add_change_entry(Phone_Directory& the_directory)
{
string name;
string number;
cout << "Enter name: ";
getline(cin, name);
cout << "Enter number: ";
getline(cin, number);
string old_number =
the_directory.add_or_change_entry(name, number);
if (old_number != "") {
cout << name << " has been changed in the directory\n";
cout << "Old number was " << old_number << "\n";
}
else {
cout << name << " has been added to the directory\n";
}
}
