/**
 * An IntList is a list of ints.
 */
public class IntList {
    private int[] values;

   private IntList(int[] values) {
       this.values = values;
  }

    public static IntList make(int... values){
        return new IntList(values);
    }

    public final static IntList NIL = new IntList(new int[0]);

  /**
   * Cons the given element h onto us and return the
   * resulting IntList.
   * @param h the head int for the new list
   * @return the IntList with head h and us for a tail
   */
  public IntList cons (int h) {
      //make new array
      int[] array = new int[values.length + 1];
      // copy old array in starting at position 1
      for(int i = 1; i < array.length; i++)
          array[i] = values[i-1];
      // put h at position 0
      array[0] = h;
      return new IntList(array);
  }

  /**
   * Get our length.
   * @return our int length
   */
  public int length() {
    return values.length;
  }

  /**
   * Print ourself to System.out.
   */
  public void print() {
    System.out.print("[");
    for(int i = 0; i < values.length; i++){
        if(i>0) System.out.print(",");
        System.out.print(values[i]);
    }        
    System.out.println("]");
  }
    
}