import java.io.Serializable;

/** An evaluatable version of x^2. 
 *
 *  Taken from Core Web Programming from 
 *  Prentice Hall and Sun Microsystems Press,
 *  http://www.corewebprogramming.com/.
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

class Quadratic implements Evaluatable, Serializable {
  public double evaluate(double val) {
    return(val * val);
  }
  
  public String toString() {
    return("Quadratic");
  }
}