package utils;
/**
*
* @author Dung X. Nguyen
*/
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;
	}
}