/** Functions to calculate the area of pizza purchased, given a diameter.
 *
 * @author Ian Barland
 * @version 2007.Jan.10
 */
class PizzaServer {

  /** Calculate the area of a pizza, given its diameter.
   * @param diam The diameter of the pizza, in inches.
   * @return The area of the pizza, in square inches.
   *    p.pizzaArea( 0) =    0
   *    p.pizzaArea( 2) =~   3.14
   *    p.pizzaArea(12) =~ 113.04
   *    p.pizzaArea(16) =~ 209.96
   *    p.pizzaArea(20) =~ 314
   */
  double pizzaArea( double diam ) {
    return 3.14 * (diam/2) * (diam/2);
    }







  /** Calculate the area of pizza ordered, given its diameter,
   * based on the "free foot friday" promo of itec120-lect01c.
   * @param diam The diameter of the pizza ordered, in inches.
   * @return The total area of pizza received, in square inches.
   *  p.friPizzaArea( 0) = p.pizzaArea( 0) + pizzaArea(12) =~ 113.04
   *  p.friPizzaArea( 2) = p.pizzaArea( 2) + pizzaArea(12) =~ 116.18
   *  p.friPizzaArea(12) = p.pizzaArea(12) + pizzaArea(12) =~ 226.08
   *  p.friPizzaArea(16) = p.pizzaArea(16) + pizzaArea(12) =~
   *  p.friPizzaArea(20) = p.pizzaArea(20) + pizzaArea(12) =~ 427.04
   */
  double friPizzaArea( double diam ) {
    return this.pizzaArea(diam) + this.pizzaArea(12);
    }




  /** Calculate the area of pizza ordered, given its diameter,
   *     based on the "20% Tuesday" promo of itec120-lect01c.
   * @param diam The diameter of the pizza ordered, in inches.
   * @return The total area of pizza received, in square inches.
   *  p.tuePizzaArea( 0) = 1.20 * p.pizzaArea( 0)  =~   0
   *  p.tuePizzaArea( 2) = 1.20 * p.pizzaArea( 2)  =~   3.768
   *  p.tuePizzaArea(20) = 1.20 * p.pizzaArea(20)  =~ 376.8
   */
  double tuePizzaArea( double diam ) {
    return 1.20 * this.pizzaArea(diam);
    // Alternately:
    //   return this.pizzaArea(diam) + 0.20*this.pizzaArea(diam);
    // However you compute "20% more", your code should match that.
    }



  /** Calculate the area of a pizza, given its diameter,
   * based on the "widening wednesdays" promo of itec120-lect01c.
   * @param diam The diameter of the pizza ordered, in inches.
   * @return The total area of pizza received, in square inches.
   *  p.wedPizzaArea( 0) = p.pizzaArea(  0 * 1.10 )  =~   0
   *  p.wedPizzaArea( 2) = p.pizzaArea(  2 * 1.10 )  =~   3.7994
   *  p.wedPizzaArea(12) = p.pizzaArea( 12 * 1.10 )  =~ 136.7784
   */
  double wedPizzaArea( double diam ) {
    return this.pizzaArea( 1.10 * diam );
    }

  }