Thread: Newbie.. Parrell arays with sentienal value . I am given RESULT must write the source code

This is the output below. I am given the 3 menu items, prices, and 3 Product numbers.

I have to create the source code. I am using elcipse ( My code at bottom)
OUTPUT
__________________________________________________ __________________________________________________ ________________________________


Enter ItemNumber of Product (OR ZERO to end) order.
1
Cheeseburger $2.49
Enter ItemNumber of Product (OR ZERO to end) order.
2
Pepsi
Enter ItemNumber of Product (OR ZERO to end) order.
3
Chips
Enter ItemNumber of Product (OR ZERO to end) order.
4
Sorry, we do not carry that item.
4 Enter ItemNumber of Product (OR ZERO to end) order.
0
Billy Goat Fast-Foods
Description Price
------------ -----
Cheeseburger $2.49
Pepsi $1.00
Chips $0.59
The total cost of this order is $ 4.08
Thank you from Bily Goat Fast-Foods.
__________________________________________________ __________________________________________________

My start on this problem

 <YOUR CODE HERE>
import.java.util.Scanner;
public class BillyGoatArrays {
 
 
	public static void main(String[] args) {
Scanner input = new Scanner (System.in);
		int itemNumber [] = {1,2, 3};
 
		String menu[] = {"Cheeseburger", "Pepsi", "Chips"};
	      double price[] = {2.49, 1.00, 0.59};
	      int loopIndex = 0;
	      for (loopIndex = 0; loopIndex < 3; loopIndex++)
	      {
	    	  System.out.println("Enter itemNumber of Product or enter ZERO to end order");
	    	  System.out.println("Menu is = " + menu[loopIndex]);
	          System.out.println(menu[loopIndex] +" Price is = " + price[loopIndex]);
	          }  
	       }
	    }

__________________________________________________ __________________________________________________ ____________________________________
I think I can figure out the print prompts . I am stuck on the array for the item number and the message for item 4. I do not understand why item number 4 shows up in output twice in a row but shows the Sorry message only once. To get the program to display all of the products sequentially and then total them has me stuck. I am wondering if I need an if statement for the number 4. Instructor says he wants this program to allow up to 100 items to be ordered. I don't know how to make the third array of item numbers with an index of 100 . Would I do something like itemnumber[100] and then go itemnumber[1] = cheeseburger, itemnumber [2] = Pepsi... and so on and then do the Sorry message for item number 4, or would I do some type of catch statement? I don't want the answers given to me.. Just a little guidance. My instructor is a a very old programmer and he DOES not Teach. He just throws this stuff at us with the chapter and expects it done when this is supposed to be our first INTRO to Programmming class. Basically everyone eventually copies the program of the one guy in the class that has a programming background.. But I don't learn anythng this way.. A littel advice appreciated. I also still have to creat a scanner object to allow console input.. That I know.. Setting the item numbet array to not use zero so it can be used as a way to end loop and total order is beyond me, too.

Please Edit your post and wrap your code with
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

Where does the program read any input from the user?

The way you use parallel arrays is to use the same index for all the arrays. For example if you search in one array and find what you were looking for, save the found index's value and use it in the other arrays to get the corresponding value from the other arrays.
Like columns written on a piece of paper. If you find something on a row in one column, the corresponding values are on the same row in the other columns. The index is the row.

gives me multiple errors

Please copy and paste here the full text of the compiler's error messages.

I am making some progress! I tested my input and everything works so far. AMAZING. I am stuck on how to "play back" the thired array in sequence to print out the description, price and total the order.. I am just learning arrays so this has me stumped. I am thinking I need to write a method of some sort that somehow references the index for the previous input.next Item numbers enter, but how do I only reference the previous input? Advice appreciated.

 <YOUR CODE HERE>
import java. util.Scanner; 
 
public class BillyGoatArrays {	
 
 
	public static void main(String[] args) {
	Scanner input = new  Scanner (System.in);
		int userInput = -1;
 
 
 
		int[] itemNumber  = new int[100];
 
 
 
		String menu[] = {"Cheeseburger", "Pepsi", "Chips"};
		double price[] = {2.49, 1.00, 0.59};
		int position = 0;
		while ( userInput != 0 )  
		{
			System.out.println("Enter itemNumber of Product (OR enter ZERO to end order): ");
			userInput = input.nextInt();
 
			if (userInput > 0 && userInput < 4)	
			{
 
			}
			else if (userInput != 0)
			{
				System.out.println("Sorry we do not carry that item ");
			} System.out.println (" Billy Goat Fast-Foods");
			System.out.println (" Description\t Price");
			System.out.println ("-----------\t-----");
 
 
		}  
	}
}

how to "play back" the thired array in sequence to print out the description, price and total the order

Can you explain what "play back" means.

Remember parallel arrays are like rows of data in columns on a piece of paper. The columns are represented by the arrays in your program. The row is selected by the array index
If you find an item on a row in a column that you are interested in, the data on the same row in the other columns are all related. Once the index is set to point to a row, then that same index can be used in the other arrays to get the corresponding data from the other arrays.

Do you have any specific questions about your assignment?
What are you trying to do next? Do one thing at a time, test it, get it to work before moving to the next thing. Use println statements to print out the results of each step to be sure the code is doing what you expect.

How to total everything

Use a variable to hold the total. As you get a new amount for the selected item, add it to the variable.
When you exit the loop the variable will have the total and can be printed.

it would not let me

Any time you get error messages you need help with should post them and the code.


I'm done for tonight, back tomorrow,