using System;

​

​

namespace U2Project

{

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Enter sandwich: (beef [$8.50], chicken [$7.50], veggie [$7.75])");

            double bill = 0;

            bool coop = false;

            String s = Console.ReadLine();

            String sc = "";

            String bs = "";

            String fs = "";

            switch (s)

            {

                case ("beef"):

                    Console.WriteLine("you chose beef");

                    sc = "beef";

                    bill += 8.5; 

                    break;

                case ("chicken"):

                    Console.WriteLine("you chose chicken");

                    sc = "chicken";

                    bill += 7.5;

                    break;

                case ("veggie"):

                    Console.WriteLine("you chose veggie");

                    sc = "veggie";

                    bill += 7.75;

                    break;

                default: Console.WriteLine("invalid");

                    sc = "invalid";

                    break;

​

            }

            Console.WriteLine("beverage? (Y or N)");

            bool b = false;

            string s2 = Console.ReadLine();

            switch (s2)

            {

                case ("Y"):

                    Console.WriteLine("OK");

                    b = true;

                    break;

                case ("N"):

                    Console.WriteLine("that's fine");

                    b = false;

                    break;

                default : Console.WriteLine("invalid");

                    break;

​

            }

            if(b)

            {

                Console.WriteLine("what size: (small [$1.50], medium [$2], large [$2.50])");

                string s3 = Console.ReadLine();

                switch (s3)

                {

                    case ("small"):

                        Console.WriteLine("you chose small");

                        bs = "small";

                        bill += 1.5;

                        break;

                    case ("medium"):

                        Console.WriteLine("you chose medium");

                        bs = "medium";

                        bill += 2;

                        break;

                    case ("large"):

                        Console.WriteLine("you chose large");

                        bs = "large";

                        bill += 2.5;

                        break;

                    default: Console.WriteLine("invalid");

                        bs = "invalid";

                        break;

                }

​

            }

            Console.WriteLine("fries? (Y or N)");

            string s4 = Console.ReadLine();

            bool f = false;

            switch (s4)

            {

                case ("Y"):

                    Console.WriteLine("OK");

                    f = true;

                    break;

                case ("N"):

                    Console.WriteLine("That's Fine");

                    f = false;

                    break;

                default: Console.WriteLine("invalid");

                    break;

            }

            if(f)

            {

                Console.WriteLine("what size: (small [$1.50], medium [$2], large [$2.50])");

                string s5 = Console.ReadLine();

                switch (s5)

                {

                    case ("small"):

                        Console.WriteLine("you chose small");

                        Console.WriteLine("supersize? (Y or N)");

                        string s6 = Console.ReadLine();

                        switch(s6)

                        {

                            case ("Y"):

                                Console.WriteLine("it's large now");

                                fs = "large";

                                bill += 2.5;

                            break;

                            case ("N"):

                                Console.WriteLine("fine");

                                break;

                             default: Console.WriteLine("invalid");

                                break;

                        }

                        fs = "small";

                        bill += 1.5;

                        break;

                    case ("medium"):

                        Console.WriteLine("you chose medium");

                        fs = "medium";

                        bill += 2;

                        break;

                    case ("large"):

                        Console.WriteLine("you chose large");

                        fs = "large";

                        bill += 2.5;

                        break;

                    default:

                        Console.WriteLine("invalid");

                        fs = "invalid";

                        break;

​

                }

            }

            if (f && b)

            {

                Console.WriteLine("you get $1 off for ordering a full package");

                coop = true;

                bill -= 1;

            }

            Console.WriteLine($"you ordered sandwich: {sc} drink: {bs} fries: {fs}");

            Console.WriteLine($"your bill is {bill} and coupon is {coop}");

            Console.WriteLine("enter pay amount");

            String s7 = Console.ReadLine();

            if (double.TryParse(s7, out double n) && n-bill > 0)

            {

                Console.WriteLine($"your change is {n - bill}");

            }

            else { Console.WriteLine("invalid"); }

            Console.WriteLine($"receipt: \n order {sc}, {bs} drink, and {fs} fries \n total {bill:C} discount {coop} change {n-bill:C}");

​

​

        }

    }

}

​