package algs13;

import java.util.Iterator;
import stdlib.*;

public class XIteratorClient {
  public static int sum1 (Stack<Integer> a) {
    int result = 0;
    Iterator<Integer> it = a.iterator ();
    while (it.hasNext ()) {
      int item = it.next ();
      result += item;
    }
    return result;
  }
  public static int sum2 (Stack<Integer> a) {
    int result = 0;
    for (int item : a) {
      result += item;
    }
    return result;
  }
  public static void main (String[] args) {
    Stack<Integer> a = new Stack<> ();
    a.push (-1);
    a.push (-2);
    a.push (-3);
    StdOut.println (sum1(a));

  }

}