How to add all the prices?

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C++

I want to add the prices in the purchase if I want to buy more items. But I do not know how to do that. For example if, I confirm my purchase and want to buy more items, I want it to add the prices that is confirmed to purchase, and if I finally do not want to buy more items and not to look for more items, that total price would be computed. The total is not keeping in track. For example is that, I confirmed to purchase the first item, and if I wanted to buy more, the price of the first item is not adding, while the 2nd item that I confirmed to purchase is the one that been showing.

What I have tried:

int main()
    {
        int choice;
        int purchase;
        int quantity;
        double totalChoice1;
        double totalChoice2;
        char view;
        char confirm;
        char buyMore;
        char look;
        double alloy, apex, kraken, aorus;
        double oppo, alpha, rog, huawei;
        double ps4, nintendo, xbox, wii;

        alloy = 69.99;
        apex = 199;
        kraken = 90;
        aorus = 60;

do {
    cout << "What type of items would you like to view?" << endl;
    cout << " [1] Peripherals" << endl;
    cout << " [2] Mobile Phones" << endl;
    cout << " [3] Consoles" << endl;
    cout << " [4] Exit" << endl;
    cout << "Enter your choice: ";
    cin >> choice;


    if (choice == 1) {
        cout << "--------------------" << endl;
        cout << "What peripherals would you like to purchase?" << endl;
        cout << "[1] HyperX Alloy FPS PRO - $69.99" << endl;
        cout << "[2] SteelSeries APEX PRO - $199" << endl;
        cout << "[3] Razer Kraken X - $90" << endl;
        cout << "[4] AORUS K7 - $60" << endl;
        cout << "[5] BACK TO MENU"  << endl;
        cout << "Enter your choice: ";
        cin >> purchase;
        cout << "--------------------" << endl;


        if (purchase == 1) {
            cout << "How many would you like to purchase? ";
            cin >> quantity;
            totalChoice1 = quantity * alloy;

            cout << "The total price for that is " << totalChoice1 << endl;
            cout << "Confirm the Purchase? [Y]/[N]: ";
            cin >> confirm;

            if (confirm == 'Y') {
                totalChoice1; // This is just a trial code.
                cout << "Would you like to buy more items? [Y]/[N]: ";
                cin >> buyMore;
            }
            else if (confirm == 'N') {
                cout << "Do you still want to look for items? [Y]/[N]: ";
                cin >> look;

                if (look == 'N') {
                    break;
                }
            }
            else {
                break;
            }
        }
}
while (purchase == 5 || buyMore == 'Y' || look == 'Y');
cout << "The total price for your items is: " << totalChoice1; // This is also a trial code (totalChoice1)
}