using System;

​

namespace pizza_exam

{

    internal class Program

    {

        static void Main(string[] args)

        {

            // Customer details

            Console.WriteLine("Enter Customer Name:");

            string name = Console.ReadLine();

​

            Console.WriteLine("Enter Address:");

            string address = Console.ReadLine();

​

            Console.WriteLine("Enter Phone Number:");

            string phone_number = Console.ReadLine();

​

            // Pizza order details

            Console.WriteLine("\nHow many pizzas would you like to order? (1-6)");

            int num_of_pizzas = Convert.ToInt32(Console.ReadLine());

            if (num_of_pizzas < 1 || num_of_pizzas > 6)

            {

                Console.WriteLine("Invalid number of pizzas. Please enter a number between 1 and 6.");

                return;

            }

​

            double totalCost = 0;

            double pizzaCost;

            int toppingsChoice;

            string[] pizzaSizes = { "Small", "Medium", "Large" };

            double[] pizzaPrices = { 3.25, 5.50, 7.15 };

            double[] toppingPrices = { 0, 0.75, 1.35, 2.00, 2.50 };

​

            for (int i = 0; i < num_of_pizzas; i++)

            {

                Console.WriteLine($"\nChoose size for pizza {i + 1}: (1) Small, (2) Medium, (3) Large");

                int pizzaSizeChoice = Convert.ToInt32(Console.ReadLine());

                if (pizzaSizeChoice < 1 || pizzaSizeChoice > 3)

                {

                    Console.WriteLine("Invalid pizza size choice.");

                    return;

                }

​

                pizzaCost = pizzaPrices[pizzaSizeChoice - 1];

                Console.WriteLine($"Cost for {pizzaSizes[pizzaSizeChoice - 1]} pizza: £{pizzaCost}");

​

                Console.WriteLine("Choose extra toppings: (1) None, (2) 1 Topping, (3) 2 Toppings, (4) 3 Toppings, (5) 4 or more Toppings");

                toppingsChoice = Convert.ToInt32(Console.ReadLine());

                if (toppingsChoice < 1 || toppingsChoice > 5)

                {

                    Console.WriteLine("Invalid toppings choice.");

                    return;

                }

​

                pizzaCost += toppingPrices[toppingsChoice - 1];

                totalCost += pizzaCost;

                Console.WriteLine($"Cost for pizza {i + 1} with toppings: £{pizzaCost}");

            }

​

            // Apply discount

            if (totalCost > 20)

            {

                double discount = totalCost * 0.10;

                totalCost -= discount;

                Console.WriteLine($"Discount applied: £{discount}");

            }

​

            // Delivery option

            Console.WriteLine("Do you require delivery? (y/n)");

            string deliveryOption = Console.ReadLine();

            double deliveryCharge = 0;

​

            if (deliveryOption.ToLower() == "y")

            {

                deliveryCharge = 2.50;

                totalCost += deliveryCharge;

            }

​

            // Displaying the bill

            Console.WriteLine("\n----- Final Bill -----");

            Console.WriteLine($"Name: {name}");

            Console.WriteLine($"Address: {address}");

            Console.WriteLine($"Phone Number: {phone_number}");

            Console.WriteLine($"Total Cost of Pizzas: £{totalCost - deliveryCharge}");

            if (deliveryCharge > 0)

            {

                Console.WriteLine($"Delivery Charge: £{deliveryCharge}");

            }

            Console.WriteLine($"Total Cost: £{totalCost}");

        }

    }

}

​