using System;

public class Program

{

public static void Main()

    {

            int quantity, cash, change;

            int total;

            string choice, YN;

        do

                      {

                Console.WriteLine("Welcome To Store 101");

                 Console.WriteLine("item id: 001 | Item Name: Item 1 | Price: P20");

                Console.WriteLine("item id: 002 | Item Name: Item 2 | Price: P40");

                Console.WriteLine("item id: 003 | Item Name: Item 3 | Price: P60");

​

                Console.Write("Select Item Id: ");

                choice = Console.ReadLine();

​

                 if (choice == "001")

                            {

                    Console.WriteLine("Item Selected: item id: 001 | Item Name: Item 1 | Price: P20");

                    Console.Write("Input Quantity: "); 

                    quantity = Int32.Parse(Console.ReadLine());

​

                    total = quantity * 20;

​

                    Console.WriteLine("Total: " + total);

                    Console.Write("Cash Rendered: ");

                    cash = Int32.Parse(Console.ReadLine());

​

                    if (cash >= total)

                           {

                        change = cash - total;

​

                        Console.WriteLine("Change: " + change);

                            }

                    else

                            {

                        Console.WriteLine("Not Enough Cash");

                            }

                      }

                 else if  (choice == "002")

                      {

                    Console.WriteLine("Item Selected: item id: 002 | Item Name: Item 2 | Price: P40");

                    Console.Write("Input Quantity: ");

​

                    quantity = Int32.Parse(Console.ReadLine());

​

                    total = quantity * 40;

​

                    Console.WriteLine("Total: ", total);

​

                    Console.Write("Cash Rendered: ");

                    cash = Int32.Parse(Console.ReadLine());

                    if (cash >= total)

                          {

                         change = cash - total;

                        Console.WriteLine("Change: " + change);

                          }

                    else

                          {

                        Console.WriteLine("Not Enough Cash");

                          }

                      }

                else if (choice == "003")

                          {

                    Console.WriteLine("Item Selected: item id: 003 | Item Name: Item 3 | Price: P60");

                    Console.Write("Input Quantity: ");

​

                    quantity = Int32.Parse(Console.ReadLine());

​

                    total = quantity * 60;

​

                    Console.WriteLine("Total: " + total);

​

                    Console.Write("Cash Rendered: ");   

                    cash = Int32.Parse(Console.ReadLine());

​

                      if (cash >= total)

                            {

                        change = cash - total;

​

                        Console.WriteLine("Change: " + change);

                      }

                        else

                             {

                        Console.WriteLine("Not Enough Cash");

                          }

                         }

                      else

                           {

                    Console.WriteLine("You Enter the wrong Item ID!");

                           }

                Console.Write("Enter 'Y' for another transaction Or Enter any key to exit:");

                YN = Console.ReadLine();

                Console.Clear();

                          }

              while (YN == "Y");

                            }

               }