/** Our internal representation of a number in the N0 language.
 * See http://www.radford.edu/itec380/2009fall-ibarland/Hw06/hw06.html
 * 
 * @author Ian Barland
 * @version 2008.Nov.30
 */
public class Num extends Value {
  private double x;
  Num( double _x ) { this.x = _x; }
  
  public String toString() {
      // Let's make ints look better than, say, "43.0":
      if (UtilIan.equalsApprox(x,UtilIan.roundTo(x,0))) {
          return Long.toString(Math.round(x));
          }
      else {
          return Double.toString(x);
          }
      }
 
  /** Return the Java double this Value represents
   *  (for use by other primitives in our language.)
   * @return the Java double this Value represents.
   */
  double doubleValue() { return this.x; }

  }