public class Exercise6c
{
  public static class NotFoundException extends Exception { }

  // returns first position in a at which x occurs
  // (throws exception, if there is no such position)
  public static int search(int[] a, int x) throws NotFoundException
  {
    int n = a.length;
    for (int i=0; i<n; i++) 
      if (a[i] == x) return i;
    throw new NotFoundException();
  }
}