it works

// Exercise 1
// Game title tracking app

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <limits>

using namespace std;

int main(){

    enum menu
    {
        ENTER=1,
        DELETE,
        LIST,
        SORT_LIST,
        QUIT
    };

    vector<string> gameTitles;
    vector<string>::iterator gameTitleIter;
    bool running = true;

    int choice;
    string title;

    cout << "\t\t\tWelcome to my game title list program\n\n";
    do
    {
        cout << "Select an option:\n";
        cout << "\t" << ENTER << " - Enter a title\n";
        cout << "\t" << DELETE << " - Delete a title\n";
        cout << "\t" << LIST << " - List titles\n";
        cout << "\t" << SORT_LIST << " - Sort list\n";
        cout << "\t" << QUIT << " - Quit\n";

        cout << "Enter choice: ";
        cin >> choice;
        switch(choice){
            case ENTER:
                cout << "\nEnter Game title (to add): ";
                cin.ignore( numeric_limits<streamsize>::max(), '\n' );
                getline(cin,title);
                gameTitles.push_back(title);
            break;
            case DELETE:

                cout << "\nEnter a title (to delete): ";
                cin.ignore( numeric_limits<streamsize>::max(), '\n' );
                getline(cin,title);
                gameTitleIter = find(gameTitles.begin(), gameTitles.end(), title);
                if (gameTitleIter != gameTitles.end())
                {
                    gameTitles.erase(gameTitleIter);
                }else{
                    cout << "\nTitle was not found.";
                }

            break;
            case LIST:
                cout << "\nGame titles:\n";
                for (gameTitleIter = gameTitles.begin(); gameTitleIter != gameTitles.end(); ++gameTitleIter)
                {
                    cout << "\t" << *gameTitleIter << endl;
                }

            break;
            case SORT_LIST:
                sort(gameTitles.begin(), gameTitles.end());
                cout << "\nList sorted.\n";
            break;
            case QUIT:
                running = false;
            break;
            default:
                cout << "\nInvalid option.\n";
        }
        cin.clear();
    } while (running);
}