/**
 * A PizzaServer knows how to answer basic
 * questions about the area of pizzas.
 * Also, this version adds a salary.
 *      
 * @author Ian Barland
 * @version 2007.Feb.05
 */
class PizzaServer {
 
  
  /** The salary of this particular PizzaServer (in $/hr). */
  double salary = 5.75;
  
  /** Ask this particular PizzaServer about their salary.
   * @return This PizzaServer's salary (in $/hr). 
   *
   *   Note: No test cases, for the moment!
   *   (Because the answer depends on the history of the 
   *    particular PizzaServer we ask; we can no longer say 
   *    'with a certain input, the answer is always such-and-such'.
   *    We'll discuss proper testing of methods-involving-fields soon.)
   */
  double getSalary() {
    return this.salary;
    }   

  /** Set this particular PizzaServer's salary.
   * @param _salary  The new salary for this employee (in $/hr).
   */
  void setSalary( double _salary ) {
    this.salary = _Salary;
    }
  


  
  /** 
   * Calculate the area of a pizza, given its diameter.
   *
   * @param diam The diameter of a pizza (in inches).
   * @return The area (in sq.in.).
   * <br/>
   * <br/> Test cases (if p is a PizzaServer instance):
   * <br/> p.pizzaArea( 0) =   0          +/- 0.0001
   * <br/> p.pizzaArea( 2) =   3.14       +/- 0.0001
   * <br/> p.pizzaArea(20) = 314.0        +/- 0.0001
   * 
   * <br/> p.pizzaArea( 4) = 12.52        +/- 0.0001
   * <br/> p.pizzaArea(16) = 201.5        +/- 0.0001
   */
  double pizzaArea( double diam ) {
    double radius = diam/2.0;
    return Math.PI * radius * radius;
    }
 
    
  /**
   * Given a pizza diameter, calculate how much crust there is (in sq.in.).
   * It is guaranteed that there is {@value CRUST_WIDTH}" of crust around the edge;
   * hey, this means 2*{@value CRUST_WIDTH}" is the smallest allowable pizza.
   *
   * @param diam The diameter of the pizza (in inches); diam must be >= 4.
   * @return The amount of crust (in sq.in.).
   * <br/>
   * <br/> Test cases:
   * <br/> p.crustArea( 6) =  28.16  +/- 0.0001
   * <br/> p.crustArea(20) = 160.14  +/- 0.0001
   */
  double crustArea( double diam ) {
    return pizzaArea(diam) - pizzaArea( diam - 2*3 );
    }


  }