#include <iostream.h>
  #include <conio.h>
 
  const  int MAX_ITEMS = 5;
 
  typedef int InventoryArray[MAX_ITEMS];
 
  void DisplayOpeningMessage();
  void DisplayEndMessage();
  void OutputInventory(const InventoryArray items);  // const used to protect the array from being changed
  void InputInventory(InventoryArray items);
  void ProcessChoices();
 
  void OutputOneInventoryAmount(int amount, int itemCode);
  void ChangeOneInventoryAmount(InventoryArray items, int itemCode);
  char GetItemCode();
 
  void DeductInventory(InventoryArray items, int itemCode);
 
 
  void AddInventory(InventoryArray items, int itemCode);
 
  char GetUsersChoice();
 
 
  void main()
  {
 
 
   DisplayOpeningMessage();
   ProcessChoices();
   DisplayEndMessage();
  }
 
 
 
  void DisplayOpeningMessage()
 
  {
           cout << "\n\n\n\n\n";
   cout << "                 Iventory\n\n";
   cout << "                 Program\n\n";
   cout << "                 Collective\n\n\n\n\n\n";
 
  }
 
  void DisplayEndMessage()
  {   cout << "           Thanks for your effort\n\n\n\n\n\n";
  }
 
  void ProcessChoices()
  {
   InventoryArray itemInventory;
 
   char choice;
   int itemCode;
 
   InputInventory(itemInventory);   // Create the initial inventory
 
   bool done = false;
 
   choice = GetUsersChoice();
   while (!done)
   {
    switch (choice)
    { case 'L':  // List Inventory
     case 'l':
      OutputInventory(itemInventory);
      break;
 
     case 'S':  // Single product listed
     case 's':
      itemCode = GetItemCode();
      while ((itemCode < MAX_ITEMS) && (itemCode >= 0))
 
      { OutputOneInventoryAmount(itemInventory[itemCode], itemCode);
       itemCode = GetItemCode();
       cout <<  "\n\n\n";
      }
      break;
     case 'C':
     case 'c':
      itemCode = GetItemCode();
      while ((itemCode < MAX_ITEMS) && (itemCode >= 0))
 
      { ChangeOneInventoryAmount(itemInventory, itemCode);
       itemCode = GetItemCode();
       cout <<  "\n\n\n";
      }
      break;
     case 'A': // Add to inventory
     case 'a':
      itemCode = GetItemCode();
      while ((itemCode < MAX_ITEMS) && (itemCode >= 0))
 
      { AddInventory(itemInventory, itemCode);
       itemCode = GetItemCode();
       cout <<  "\n\n\n";
      }
      break;
     case 'D': // Deduct from inventory
     case 'd':
                                  itemCode = GetItemCode();
      while ((itemCode < MAX_ITEMS) && (itemCode >= 0))
 
      { DeductInventory(itemInventory, itemCode);
       itemCode = GetItemCode();
       cout << "\n\n\n";
      }
      break;
     case 'E': //Exit from program
     case 'e':
      cout << "Do you want to really want top quit (Y) or (N)\n";
      char answ;
      cin >> answ;
      if ((answ =='Y') || (answ == 'y'))
      {
       done = true;
      }
 
      break;
     default:
      cout << "Choice is invalid. Select another.\n\n";
    } // end switch
                 if (!done)
    {
     choice = GetUsersChoice();
    }
 
   } // end while
  }
 
  char GetUsersChoice()
  {  char choice;
   cout <<  "\n\n\n\n";
   cout << "Please make a selection:\n";
   cout << "   <L> List inventory\n";
   cout << "   <S> Show inventory of singular item\n";
   cout << "   <D> Deduct singular item\n";
   cout << "   <A> Add an item\n";
   cout << "   <C> Change location of an item\n";
   cout << "   <Q> Exit\n";
   cin >> choice;
   return choice;
  }
 
 
  char GetItemCode()
  { int code;
   cout << "Please enter the code for the item you wish to work with\n"; //+++++++++++++++trouble spot
   cout << "Enter a negative number to indicate you are finished\n";
   cin >> code;
   while (code > MAX_ITEMS -1) // check for code that is too high
   { cout << "Invalid item code. Please enter a valid code.\n";
    cin >> code;
   }
  // cin.ignore(1);
   return code;
 
  }
 
 
  void OutputOneInventoryAmount(int amount, int itemCode)
  {  cout << endl << endl << "The inventory amount for item " << itemCode
       << " is: "      <<  amount << endl << endl;
  }
 
  void OutputInventory(const InventoryArray items)
  {
   cout << "\n\n\n\n\n";
   for (int itemCode = 0; itemCode < MAX_ITEMS;  itemCode++)
   {
    cout << "The inventory amount for item " << itemCode
       << " is: "      <<  items[itemCode] << endl;
   }
   cout << "\n\n\n\n\n\n";
  }
 
 
  void InputInventory(InventoryArray items)
  {  int itemAmount;
   for (int itemCode = 0; itemCode < MAX_ITEMS;  itemCode++)
   {
    cout << "Please enter the inventory item " << itemCode << ": ";  //++++++++++++++++trouble spot
    cin >> itemAmount;
    items[itemCode] = itemAmount;
   }
  }
 
  void ChangeOneInventoryAmount(InventoryArray items, int itemCode)
  { int amount;
   cout << "Please enter the new amount in the inventory\n";
   cin >> amount;
   items[itemCode] = amount;
  }
 
  void DeductInventory(InventoryArray items, int itemCode)
  { int amount;
   cout << "Please enter the amount sold of item\n";
   cin >> amount;
   items[itemCode] -= amount;
  }
 
 
  void AddInventory(InventoryArray items, int itemCode)
  { int amount;
   cout << "Please enter the amount to add of item\n";
   cin >> amount;
   items[itemCode] += amount;
  }