#include <iostream>
#include <array>
#include <format>
#include <string>

int main() {
    auto options = std::to_array<std::string>(
        { "ICU Monitor","Get'er Done! Monitor","Gamer's Delight Monitor", "Checkout" });
    auto prices = std::to_array<float>({ 159.99, 179.99, 249.99 });

    float total = 0.0;
    for(;;)
    {
        std::cout << std::format("\n{0:>13}\n", "MENU");
        for (size_t n = 0; n < options.size(); ++n)
        {
            std::cout << std::format("{0}. {1}", (n + 1), options[n]);
            if (n < prices.size()) std::cout << " $" << prices[n];
            std::cout << "\n";
        }
        std::cout << std::format("\nEnter the option (1-{}): ", options.size());

        int choice;
        std::cin >> choice;

        if ((choice > 0) && (choice <= prices.size()))
        {
            std::cout << "Enter Item Quantity: ";

            int quantity;
            std::cin >> quantity;

            total += quantity * prices[choice - 1];
        }
        else if (choice == options.size()) break;
        else
        {
            std::cout << "Invalid option";
        }
    }

    const float tax_rate = 0.065F;
    float sales_tax = total * tax_rate;
    std::cout <<
        std::format(
            "\nTotal Cost of Monitors: ${0:.2f}"
            "\nSales Tax(calculated at {1:.1f} %) : ${2:.2f}"
            "\nBalance Due: ${3:.2f}\n",
            total, (tax_rate * 100.0), sales_tax, (total + sales_tax));

    return 0;
}