using System;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace final

{

    public class Program

    {

        public static string pN = "";

        public static Dictionary<string, int> prodPrice = new Dictionary<string, int>();

        static void Main(string[] args)

        {

            const int ext = 5;

            int loop = 0;

            while (loop != ext)

            {

                Console.Clear();

                DrawLine();

                DisplayTitle();

                DrawLine();

                DisplayMenu();

                try

                {

                    int choice = int.Parse(Console.ReadLine());

                    switch (choice)

                    {

                        case 1: { Addnew(); break; }

                        case 2: { View(); break; }

                        case 3: { Delete(); break; }

                        case 4: { Transact(); break; }

                        case 5:

                            {

                                Console.WriteLine("Good Bye! Thank you for transacting with us");

                                System.Threading.Thread.Sleep(2000);

                                Environment.Exit(0); break;

                            }

                        default: Console.WriteLine("Choice not in the menu, press key to continue."); break;

                    }

                }

                catch (Exception err)

                {

                    Console.WriteLine(err.Message + "Try again ...!");

                }

​

                Console.ReadKey();

            }

        }

​

        static void DrawLine()

        {

            Console.WriteLine("==============================================");

        }

​

        static void DisplayTitle()

        {

            Console.WriteLine("        +++   KD & MJ Shop (POS)   +++        ");

        }

​

        static void DisplayMenu()

        {

            Console.WriteLine();

            Console.WriteLine("\t1. Add a Product");

            Console.WriteLine("\t2. View Product List");

            Console.WriteLine("\t3. Delete a Product");

            Console.WriteLine("\t4. Transact Sales");

            Console.WriteLine("\t5. Exit Program");

            Console.WriteLine();

            DrawLine();

            Console.WriteLine("Make your choice: Type 1, 2,... or 5 for exit");

            DrawLine();

        }

​

​

        static void Addnew()

        {

            Console.Clear();

            double pP = 0;

            string pN = "";

            Console.WriteLine("= = = = = = < Add New Product > = = = = = =");

            do

            {

                try

                {

                    Console.Write("Product Name: ");

                    pN = Console.ReadLine();

                    Console.Write("Product Price: ");

                    pP = Convert.ToDouble(Console.ReadLine());

                    prodPrice[pN] = pP;

                    Console.WriteLine("! Product added to the system.");

                    Console.WriteLine();

                    Console.WriteLine("Press any key to continue, [x] to stop");

                    Console.WriteLine();

                }

                catch (Exception err)

                {

                    Console.WriteLine("! Product not added." + err.Message);

                    Console.WriteLine();

                    Console.WriteLine("Press any key to continue, [x] to stop");

                    Console.WriteLine();

                }

            }

            while (Console.ReadKey(true).Key != ConsoleKey.X);

        }

        static void View()

        {

            Console.Clear();

            Console.WriteLine("= = = = = = < Product List View > = = = = = =");

            foreach (KeyValuePair<string, int> kvG in prodPrice)

            {

                Console.WriteLine("Product Name: {0}", kvG.Key, kvG.Value);

                Console.WriteLine("    Price: {1}", kvG.Key, kvG.Value);

            }

        }

        static void Delete()

        {

            Console.Clear();

            Console.WriteLine("= = = = = = < Delete Product > = = = = = =");

​

            do

            {

                foreach (KeyValuePair<string, int> kvG in prodPrice)

                {

                    Console.Write("Product Name: ");

                    pN = Console.ReadLine();

​

                    if (prodPrice.ContainsKey(pN))

                    {

                        prodPrice.Remove(pN);

                        Console.Write("Product was succefully deleted!");

                        Console.WriteLine();

                        Console.Write("Press any key to delete another, [x] to stop");

                        Console.WriteLine();

​

​

                    }

                    else

                    {

                        Console.Write("Product do not exists! Press any key to continue, [x] to stop");

                        Console.WriteLine();

​

                    }

                }

            }

            while (Console.ReadKey(true).Key != ConsoleKey.X);

        }

​

        static void Transact()

        {

            Console.Clear();

            double prd;

            Console.WriteLine(" = = = = = = < Transact Sales > = = = = = =");

            Console.WriteLine("Note:Press any key after selecting product to continue, [x] to stop transaction!");

​

        }

    }

}

​

​