public class Utility
{
	/**
    * Prints an array of int for indices ranging from lo to hi.  The printed array
    * should be bracketted by by matching curly braces.  The array elements should
    * be separated by commas.
    * Examples:
    * The empty array should print as {}.
    * The array containing the single int -3 should print as {-3}.
    * The array containing -3 and 5 in this order should print as {-3, 5}.
    *
	 * @param A an array of int.
	 * @param lo an index in the range [0:A.length-1].
	 * @param hi an index in the range [0:A.length-1].
	 */
	public static void printArray(int[] A, int lo, int hi)
	{
      if (hi < lo)
      {
         System.out.println ("{}");
         return;
      }
      System.out.print ("{");
      for (int i = lo; i < hi; i++)
      {
         System.out.print(A[i] + ", ");
      }
      System.out.println (A[hi] + "}");
	}

	/**
    * Computes and returns x to the n-th power.
	 * @param x 
	 * @param n >= 0.
    * @return x to the n-th power.
	 */
	public static int power(int x, int n)
	{
      int iP = 1;
      for (int i = 1; i <= n; i++)
      {
         iP *= x;
      }
      return iP;
	}

	/**
    * Tests printArray(...) and power(...).
	 * @param args 
	 */
	public static void main(String[] args)
	{
      int[] A0 = {};
      printArray (A0, 0, A0.length - 1);
      int[] A1 = {-3};
      printArray (A1, 0, A1.length - 1);
      int[] A = {99, 0 , -8, 55, 0, 23};
      printArray (A, 1, A.length - 2);
      System.out.println ("power (-2, 0) = " + power (-2, 0));
      System.out.println ("power (-2, 1) = " + power (-2, 1));
      System.out.println ("power (-2, 2) = " + power (-2, 2));
	}
}