java - How to keep a total with an array? -

question: write program creates 2 parallel arrays. first string array contains names of items in grocery list. second array of prices each item. must satisfy following conditions:

1. print numbered list of items in first array prices.
2. ask user select item , specify quantity.
3. keep track of running total shopping.
4. when enter 0 exit, print total amount due.

i'm confused arrays, , having trouble calculating total. appreciated.

here's have far...

 public static void main(string[] args) {     scanner in = new scanner(system.in);     system.out.println("items on list");     string[] list = {"eggs", "milk", "chicken", "cereal"};     double[] prices = {2.00, 2.50, 4.50, 1.00};     (int = 0; < 4; i++) {         system.out.println((i + 1) + ". " + list[i] + " " + prices[i]);     }      system.out.println("what item want");     int item1 = in.nextint();     system.out.println("what quantity");     int quantity1 = in.nextint();     double total1;     double total2;     double total = 0;     while (item1 != 0) {         system.out.println("would item");         int item2 = in.nextint();         if (item2 == 0) {             system.out.println(total);             break;         }         system.out.println("what quantity?");         int quantity2 = in.nextint();         total1 = (prices[item1 - 1] * quantity1);         total2 = (prices[item2 - 1] * quantity2);         total = total1 + total2;     } } 

}

ah, close. don't need keep track of 2 items, one. also, want add total each iteration, not overwrite it. currently, total variable contains price of first item * quantity plus last item entered.

system.out.println( "what want?" ); int item = in.nextint(); double total = 0;  while( item != 0 ) {      system.out.println( "how many?" );     int quant = in.nextint();      // below equiv total += prices[item-1] * quant;     total = total + (prices[item-1] * quant); // add total                                               // 0, after first                                               // iteration cost of first item*quantity.                                               // , keeps adding new item*quantity it.      // notice done @ end of loop next statement     // gets executed whether continue or not.     system.out.println( "which item?" );     item = in.nextint(); }