using System;

​

public class Program

{

    public static void Main()

    {

        //Variable Declarations

        string option = "";

        //Display name of food canteen: Ran Dom's Dimsum

        Console.WriteLine("-=Ran Dom's Dimsum=-");

        //Display choices

        Console.WriteLine("Choose your option (1,2,3 or 4):");

        Console.WriteLine("1. Food Menu");

        Console.WriteLine("2. Drinks Menu");

        Console.WriteLine("3. Get Bill");

        Console.WriteLine("4. Loyalty Card");

        //Save choice to variable

        option = Console.ReadLine();

        //if option is 1 run code for food 

        if (option == "1")

        {

            //variable declaration

            string choice = "A";

            double quantity = 0.0;

            //declare choices

            Console.Write("\nA) Dimsum");

            Console.Write("\nB) Pecking Duck");

            Console.Write("\nC) Roast Pork");

            //ask user to select food

            Console.Write("\n\n\nWhat is your order?");

            choice = Console.ReadLine();

            if (choice == "A")

            {

                Console.Write("\nEnter Quantity:");

                quantity = double.Parse(Console.ReadLine());

                Console.Write("\n\nYou ordered {0} orders of dimsum.", quantity);

            }

            else if (choice == "B")

            {

                Console.Write("\nEnter Quantity:");

                quantity = double.Parse(Console.ReadLine());

                Console.Write("\n\nYou ordered {0} orders of Pecking duck.", quantity);

            }

            else if (choice == "C")

            {

                Console.Write("\nEnter Quantity:");

                quantity = double.Parse(Console.ReadLine());

                Console.Write("\n\nYou ordered {0} orders of roast pork.", quantity);

            }

            else

            {

                Console.Write("\nOrder Error");

            }

​

            Console.Read();

        }

        else if (option == "2")

        {

            //variable declaration

            string choice = "A";

            double quantity = 0.0;

            //declare choices

            Console.Write("\nA) Tea");

            Console.Write("\nB) Milk");

            Console.Write("\nC) Milktea");

            //ask user to select food

            Console.Write("\n\n\nWhat is your order?");

            choice = Console.ReadLine();

            if (choice == "A")

            {

                Console.Write("\nEnter Quantity:");

                quantity = double.Parse(Console.ReadLine());

                Console.Write("\n\nYou ordered {0} orders of tea.", quantity);

            }

            else if (choice == "B")

            {

                Console.Write("\nEnter Quantity:");

                quantity = double.Parse(Console.ReadLine());

                Console.Write("\n\nYou ordered {0} orders of milk.", quantity);

            }

            else if (choice == "C")

            {

                Console.Write("\nEnter Quantity:");

                quantity = double.Parse(Console.ReadLine());

                Console.Write("\n\nYou ordered {0} orders of milktea.", quantity);

            }

            else

            {

                Console.Write("\nOrder Error");

            }

        }

        else if (option == "3")

        {

            //Variable Declarations

            string senior = "";

            double totalorder = 0.0;

            double VAT = 0.0;

            double service = 0.0;

            double seniordiscount = 0.0;

            double newbill = 0.0;

            //Ask user for total order cost

            Console.Write("Enter the total order cost: ");

            //Save total bill to variable

            totalorder = double.Parse(Console.ReadLine());

            //Inform user of extra charges

            Console.WriteLine("Additional Charges: ");

            Console.WriteLine("12% Charge for VAT");

            Console.WriteLine("10% Charge for service");

            //Calculate extra charges

            VAT = totalorder * 0.12;

            service = totalorder * 0.10;

            //Ask if user is Senior Citizen/PWD

            Console.WriteLine("Are you a senior citizen? (Y/y or N/n) ");

            //Save answer to variable

            senior = (Console.ReadLine());

            //If Else

            if (senior == "Y")

            {

                seniordiscount = totalorder * 0.20;

                newbill = totalorder + VAT + service - seniordiscount;

                //Display the new bill

                Console.WriteLine("Your new bill is {0}.", newbill);

            }

            else if (senior == "y")

            {

                seniordiscount = totalorder * 0.20;

                newbill = totalorder + VAT + service - seniordiscount;

                //Display the new bill

                Console.WriteLine("Your new bill is {0}.", newbill);

            }

            else if (senior == "N")

            {

                newbill = totalorder + VAT + service;

                //Display the new bill

                Console.WriteLine("Your new bill is {0}.", newbill);

            }

            else if (senior == "n")

            {

                newbill = totalorder + VAT + service;

                //Display the new bill

                Console.WriteLine("Your new bill is {0}.", newbill);

            }

            else

            {

                Console.WriteLine("Invalid answer!");

            }

        }

        else if (option == "4")

        {

            //Variable Declarations

            double totalorder = 0.0;

            double loyalty = 0.0;

            double newbill = 0.0;

            //Ask user for total order

            Console.Write("Enter your total order: ");

            //Save user's bill to a variable

            totalorder = double.Parse(Console.ReadLine());

            //Ask user for loyalty card points

            Console.Write("Enter your loyalty card points: ");

            //Save user's points to a variable

            loyalty = double.Parse(Console.ReadLine());

            //Computations

            newbill = totalorder - loyalty;

            //Display result

            Console.WriteLine("Your new bill is {0}", newbill);

        }

​

        Console.Read();

    }

}