import java.util.*;
import java.io.*;
 
 
public class GrocerySim {
 
        // consider to use array list instead of table
        public static final int MAXNUMBEROFITEMS = 100;    // the maximum number of items that can be bought.
        static GroceryItem[] dataList=new GroceryItem[MAXNUMBEROFITEMS];
        static int inventory=0;
        static int quantity=0;
        static int productNumber=0;
 
 
/* readIventory will read in the file "inventory.dat" */
 
 
    private static void readInventory(String filename)
    {
        Scanner fileInput;
        File inFile = new File("inventory.dat");
        try
         {
           fileInput =  new Scanner(inFile);
           while(fileInput.hasNext())
           {
                 //You havent got items stored!!!
                 GroceryItem tempItem = new GroceryItem(); // creating new item
                 tempItem.readItem(fileInput); // filling it with data
                 dataList[inventory] = tempItem; // putting it in table
 
 
                 ++inventory;  //stick update for inventory
                 //System.out.print(inventory);
 
                   if(inventory>100)
                   {
                                        {
                                                System.out.println("Item Number "+dataList[inventory].getProductNumber()+" has already been added.");
                                        }
                   }
 
                }
 
         }
          catch(FileNotFoundException e)
          {
            System.out.println(e);
            System.exit(1);
          }
    }
 /*readCustomerInput(Scanner keyboard) will get the user input for the product number and
  * quantity of that item they want.
  */
        public static void readCustomerInput(Scanner keyboard)
        {
 
                System.out.print("Enter Product Number and Quantity:"+'\n');
                while(keyboard.hasNext())
                {
                        if(productNumber == 0 && quantity == 0)
                        {
                        	   productNumber=keyboard.nextInt();
                               quantity=keyboard.nextInt();
                               // the values are not stored anywhere,
                               // so you only have one item for 1 customer
 
                        }
                        else break;
 
                }
              }
                // System.out.println(productNumber+ " "+quantity); // debug to make sure productNumber and quantity are being read in.
 
 
 
 
 
/*calcCustomerReciept() will calculate the customers order displaying the subtotal, tax,
 * and final price.
 */
 public static void calcCustomerReciept()
 {
                int item=0;
                int numberOfCustomers=1;
                int nonFoodItem=0;                      // will determine if the item is a nonFoodItem.
                int foodItem=0;                         // will determine if the item is a foodItem.
                double foodTax = 0.2;           // food tax is 2%
                double nonFoodTax = 0.7;    // nonfood tax is 7%
 
                System.out.println('\n'+"Customer"+" "+numberOfCustomers+'\n');
                System.out.println("debug: "+productNumber+ " "+quantity);
 
                // this loop makes mo sense at all 
                // while(productNumber == 0 && quantity== 0)
 
                                               	//System.out.println("stop");
                                item=GroceryItem.itemSearch(dataList,inventory,productNumber);
 
                                if(item!=-1)
                                {
                                double priceTimesQuantity = dataList[item].getPrice()*quantity*100.0f/100.0f;
                                if(dataList[item].getTax() == 'N')
                                {
                                        nonFoodItem += priceTimesQuantity;
                                }
                                else
                                {
                                        foodItem += priceTimesQuantity;
                                }
 
                                System.out.println(dataList[item].getDescription()+"\t"+
                                        quantity+" @ "+ "$ "+ (dataList[item].getPrice())*100.0f/100.0f+
                                " "+"\t"+"$ "+priceTimesQuantity+" "+dataList[item].getTax());           // displays the quantity followed by the price
                                }                                                                        // then quantity times price and finally the food tax.)
                                //{
                                //      System.out.println("Item number "+productNumber+" is not in located in the inventory.");
 
                              //}
 
                        float subtotal = nonFoodItem+foodItem*100.0f/100.0f;                                    // subtotal = the addition of both food and nonfood items
                        double tax = (foodItem*foodTax)+(nonFoodItem*nonFoodTax)*100.0f/100.0f; // tax is food items * 2% and non food * 7%
 
                        System.out.println('\n'+"\t"+"Subtotal:\t"+"$ "+subtotal);                                        //display the subtotal
                        System.out.println("\t"+"Tax:\t\t"+"$ "+tax+'\n');                                                                                              // display the tax
                        System.out.println("\t"+"Total:\t\t"+"$ "+(subtotal+tax)*100.0f/100.0f+'\n');                               // display the final total
                        numberOfCustomers++;    //begin new customer
 
 
 }
 
 
 
        public static void main( String [] args)
        {
                        Scanner keyboard = new Scanner(System.in);
                        readInventory("inventory.dat");
                        readCustomerInput(keyboard);
                        calcCustomerReciept();
 
 
 
        }
 
}

import java.util.*;
 
public class GroceryItem
{
// static means that you have only one variable per class!!!
 
 
private int productNumber;           // the product number for an item
private String description;                      // the description of the item
private double price;                // the price for the item
private char tax;                        // the tax for the item
 
// accessor methods
 
  public  int getProductNumber() { return productNumber;}
  public String getDescription() { return description;}
  public double getPrice() { return price;}
  public char getTax() { return tax;}
 
 
 //*******************************************************************************************
 
        /* readItem(Scanner file) will read in the productNumber, description, price and tax from
         * the inventory data, it will then leave the position of the object on the next input line.
         */
 
    public GroceryItem readItem(Scanner file) // it should return new object containing data
        {
                // while(file.hasNext())
                //   you don't need that loop here it reads trough all file
                //   only most recent line in the object and leves
                //{
 
                productNumber= file.nextInt();
                description=file.next();
                price=file.nextDouble();
                tax=(file.next()).charAt(0);
                //System.out.print(productNumber+"  "+ description+"  "+ price+"  "+ tax+"  "); // debug test
                file.hasNextLine();    //leaves at the next input line
                //}
                return this;
 
        }
 
    /* itemSearch(GroceryItem [] data, int elementsUsed, int productItem) searches the array of items
     * looking for the item that matches productItem. It if cannot find it wil return -1.
     */
 
    public static int itemSearch(GroceryItem [] data, int elementsUsed , int productItem)
    {
 
        int index = -1;
        for(int i = 0; i < elementsUsed; i++)
        {
        	System.out.print("debug: "+data[i].getProductNumber());
                if(data[i].getProductNumber() == productItem)
                {
                        index = i;
                        break;
                }
        }
        return index;
    }
 
    /* printIventory(GroceryItem[] data, int elementsUsed) prints all the inventory that is
     * from i to i<elementsUsed.
     */
    public static void printInventory(GroceryItem[] data, int elementsUsed)
        {
                for(int i=0; i<elementsUsed; i++)
                {
                        System.out.printf("\t"+data[i].getProductNumber()+"\t"+data[i].getDescription()+"\t"
                                        +"\t"+data[i].getPrice()+"\t"+data[i].getTax()+'\n');
                }
        }
 
}