/* Temperature2.java (child class of Temperature)
** An instance of this class has all the capabilities of an instance of its
** parent class, but in addition supports expressing temperatures (and 
** temperature changes) in terms of Fahrenheit degrees. 
*/

public class Temperature2 extends Temperature {

   // constructor
   // -----------

   /* Initializes this Temperature to be the specified # of degrees,
   ** where that measure is to be interpreted as on the Celsius scale if
   ** the 2nd parameter is true but on the Fahrenheit scale if it is false.
   */
   public Temperature2(double degrees, boolean inCelsius) {
      // STUB!
   }


   // observer
   // --------

   /* Returns this Temperature2's value as expressed on the Fahrenheit scale.
   */
   public double degreesFahrenheit() {
      return 0.0;   // STUB!!
   }


   // mutators
   // --------

   /* Sets this Temperature2 object to the specified number of degrees on
   ** the Fahrenheit scale.
   */
   public void setToFah(double fahDeg) { }   // STUB!

   /* Changes this Temperature2 object by the specified number of Fahrenheit
   ** degrees.
   */
   public void changeByFah(double fahDeg) { }   // STUB!


   // private stuff 
   // -------------

   // The ratio describing the change in a temperature reading on the Celsius
   // scale vs. that on the Fahrenheit scale.  (A change of five degree Celsius
   // corresponds to a change of nine degrees Celsius.)
   private static final double CEL_TO_FAH_RATIO = 5.0 / 9.0;

   /* Returns the equivalent change on the Celsius scale of a change by the
   ** specified # of degrees on the Fahrenheit scale.
   */
   private double deltaFahToDeltaCel(double deltaFah) {
      return CEL_TO_FAH_RATIO * deltaFah;
   }

   /* Returns the equivalent, on the Celsius scale, of a temperature of the
   ** specified number of degrees on the Fahrenheit scale.
   */
   private double fahToCel(double fahDeg) {
      return CEL_TO_FAH_RATIO * (fahDeg - 32);
   }

}