Library Manager

/* dycesM */

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

int money = 5000; // Global Variable

struct database
{
    string songName;
    int songPrice;
    int songNumber;
    int songID;
}userStorage[30], storeStorage[30];

struct transaction
{
    string songName;
    int songPrice;
}transactionStorage[30];

void userStorageDisplay()
{
    for (int i = 0; i <= 30; i++)
    {
        if (userStorage[i].songID != NULL)
        {
            cout << "\n" << i << ". " << userStorage[i].songName << "\n" << endl;
        }
    }
}

void storeStorageDisplay()
{
    for (int i = 0; i <= 30; i++)
    {
        if (storeStorage[i].songID != NULL)
        {
            cout << "\n" << i << ". " << storeStorage[i].songName << endl;
            cout << "\t" << "Price: $" << storeStorage[i].songPrice << "\n" << endl;
        }
    }
}

void transactionStorageDisplay()
{
    for (int i = 0; i < 30; i++)
    {
        if (transactionStorage[i].songPrice != NULL)
        {
            cout << "\n" << transactionStorage[i].songName << " $:" << transactionStorage[i].songPrice << "\n" << endl;
        }
    }
}

int checkDuplicate(int songStorageValue)
{
    for (int j = 0; j <= 30; j++)
    {
        if (userStorage[j].songID == storeStorage[songStorageValue].songID)
        {
            return 0;
        }
    }
    return 1;
}

int checkBankDetails(int songNumber)
{
    if (storeStorage[songNumber].songPrice > money)
    {
        return 1;
    }
}

void purchase(int songNumber)
{
    int verification;
    int &moneyBalance = money;

    cout << "\nAre you sure you wish to purchase: " << storeStorage[songNumber].songName << " for a price of: " << storeStorage[songNumber].songPrice << " ?" << endl;
    cout << "Press 1 to confirm or 2 to exit." << endl;
    cin >> verification;

    if (verification == 1)
    {
        if (checkBankDetails(songNumber) != 1)
        {

            if (checkDuplicate(songNumber) == 1)
            {
                for (int i = 0; i <= 30; i++)
                {
                    if (userStorage[i].songID == NULL)
                    {
                        userStorage[i].songName = storeStorage[songNumber].songName;
                        userStorage[i].songNumber = i;
                        userStorage[i].songPrice = storeStorage[songNumber].songPrice;
                        userStorage[i].songID = storeStorage[songNumber].songID;

                        for (int a = 0; a <= 30; a++)
                        {
                            if (transactionStorage[a].songPrice == NULL)
                            {
                                transactionStorage[a].songName = storeStorage[songNumber].songName;
                                transactionStorage[a].songPrice = storeStorage[songNumber].songPrice;

                                money = money - transactionStorage[a].songPrice;

                                cout << "\nRemaining Value: $" << money << "\n";

                                a = 30; // To end the loop.
                            }
                        }

                        cout << "\n" << storeStorage[songNumber].songName << " has been added to your library at position number: " << i << "\n" << endl;
                        i = 30; // To end the loop.
                    }
                }
            }
            else if (checkDuplicate(songNumber) == 0)
            {
                cout << "\nYou already own this song. Purchase Cancelled." << endl;
            }
        }
        else if (checkBankDetails(songNumber) == 1)
        {
            cout << "\nInsufficient funds. Purchase cancelled." << endl;
        }
    }
    else if (verification != 1)
    {
        cout << "Transaction Aborted.";
    }
}

void main()
{

    char rerun;

    //Store Song's added for demonstration purposes.

    storeStorage[0].songName = "Daughter - Youth";
    storeStorage[0].songPrice = 25;
    storeStorage[0].songID = 2000;
    storeStorage[1].songName = "Archive - Bullets";
    storeStorage[1].songPrice = 25;
    storeStorage[1].songID = 2001;
    storeStorage[2].songName = "Swedish House Mafia - Don't you worry child";
    storeStorage[2].songPrice = 25;
    storeStorage[2].songID = 2002;
    storeStorage[3].songName = "Roykossop - Running to the sea";
    storeStorage[3].songPrice = 25;
    storeStorage[3].songID = 2003;
    storeStorage[4].songName = "French Teen Idol - Shouting can have different meanings";
    storeStorage[4].songPrice = 25;
    storeStorage[4].songID = 2004;
    storeStorage[5].songName = "From Outer Space - THe Future";
    storeStorage[5].songPrice = 25;
    storeStorage[5].songID = 2005;
    storeStorage[6].songName = "Second Suspense - Immortal";
    storeStorage[6].songPrice = 25;
    storeStorage[6].songID = 2006;
    storeStorage[7].songName = "John Legend - All of me";
    storeStorage[7].songPrice = 25;
    storeStorage[7].songID = 2007;
    storeStorage[8].songName = "One Republic - Counting Stars";
    storeStorage[8].songPrice = 25;
    storeStorage[8].songID = 2008;
    storeStorage[9].songName = "Max Richter - The nature of daylight";
    storeStorage[9].songPrice = 25;
    storeStorage[9].songID = 2009;
    storeStorage[10].songName = "The Glitch Mob - Forture Days";
    storeStorage[10].songPrice = 25;
    storeStorage[10].songID = 2010;
    storeStorage[11].songName = "French Teen Idol - (un)Told Prejudice";
    storeStorage[11].songPrice = 25;
    storeStorage[11].songID = 2011;
    storeStorage[12].songName = "Angus and Julia Stone - All of me";
    storeStorage[12].songPrice = 25;
    storeStorage[12].songID = 2012;
    storeStorage[13].songName = "Temple - Final Years";
    storeStorage[13].songPrice = 25;
    storeStorage[13].songID = 2013;
    storeStorage[14].songName = "Metric - Help I'm Alive";
    storeStorage[14].songPrice = 25;
    storeStorage[14].songID = 2014;
    storeStorage[15].songName = "Of Monsters and Men - Little Talk";
    storeStorage[15].songPrice = 25;
    storeStorage[15].songID = 2015;
    storeStorage[16].songName = "Yuna - Lullabies";
    storeStorage[16].songPrice = 25;
    storeStorage[16].songID = 2016;
    storeStorage[17].songName = "Krewella - Rise & Fall";
    storeStorage[17].songPrice = 25;
    storeStorage[17].songID = 2017;
    storeStorage[18].songName = "Gemini - Blue";
    storeStorage[18].songPrice = 25;
    storeStorage[18].songID = 2018;
    storeStorage[19].songName = "Apex - Inner Space";
    storeStorage[19].songPrice = 25;
    storeStorage[19].songID = 2019;
    storeStorage[20].songName = "Daft Punk - Get Lucky";
    storeStorage[20].songPrice = 25;
    storeStorage[20].songID = 2020;
    storeStorage[21].songName = "Daft Punk - Something about us";
    storeStorage[21].songPrice = 25;
    storeStorage[21].songID = 2021;
    storeStorage[22].songName = "Ramesses B - I need you";
    storeStorage[22].songPrice = 25;
    storeStorage[22].songID = 2022;
    storeStorage[23].songName = "Phaeleh - In the twilight";
    storeStorage[23].songPrice = 25;
    storeStorage[23].songID = 2023;
    storeStorage[24].songName = "Tom Day - Going Home";
    storeStorage[24].songPrice = 25;
    storeStorage[24].songID = 2024;
    storeStorage[25].songName = "Hans Zimmer - Time";
    storeStorage[25].songPrice = 25;
    storeStorage[25].songID = 2025;
    storeStorage[26].songName = "Awolnation - Sail";
    storeStorage[26].songPrice = 25;
    storeStorage[26].songID = 2026;
    storeStorage[27].songName = "Sia - Breathe Me";
    storeStorage[27].songPrice = 25;
    storeStorage[27].songID = 2027;
    storeStorage[28].songName = "Lemaitre - Keep Close";
    storeStorage[28].songPrice = 25;
    storeStorage[28].songID = 2028;
    storeStorage[29].songName = "Justin Beiber - Dead";
    storeStorage[29].songPrice = 25;
    storeStorage[29].songID = 2029;


    do
    {
        int userOperationChoice;
        int userPurchaseQuery;

        cout << "Hello and Welcome to the Dyces Song Library. \n\nPlease select one of the operations below. \n\n 1 - View your own library \n\n 2 - View the Store Library \n\n 3 - View your transactions. \n\n 4 - Check Bank Details \n\n Selection:";
        cin >> userOperationChoice;

        switch (userOperationChoice)
        {
        case(1) :
        {
                    goto userLibrary;
                    break;
        }
        case(2) :
        {
                    goto storeLibrary;
                    break;
        }
        case(3) :
        {
                    goto transactionLibrary;
                    break;
        }
        case(4) :
        {
                    goto bankDetails;
                    break;
        }
        }


    userLibrary:

        system("CLS");
        cout << "\nThe current songs in your library are: \n\n";
        userStorageDisplay();

        goto programEnd;


    storeLibrary:

        system("CLS");
        cout << "\nThe Store's library is: \n";
        storeStorageDisplay();

        cout << "\nPlease enter the song you wish to purchase. \n";
        cin >> userPurchaseQuery;

        purchase(userPurchaseQuery);
        goto programEnd;


    transactionLibrary:

        system("CLS");
        cout << "Your transactions are: \n";
        transactionStorageDisplay();
        goto programEnd;


    bankDetails:

        char viewTransactionHistory;

        system("CLS");
        cout << "You have: $" << money << " left in your bank account." << endl;

        cout << "\nWould you like to check your transaction history? Y/N" << endl;
        cin >> viewTransactionHistory;

        if (viewTransactionHistory == 'y' || viewTransactionHistory == 'Y')
        {
            goto transactionLibrary;
        }
        goto programEnd;


    programEnd:

        cout << "\nWould you like to go back to the main menu? Y/N" << endl ;
        cin >> rerun;
        system("CLS");

    } while (rerun == 'y' || rerun == 'Y');
}