/**
 * 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 = 5.15;
  
  /** The bank balance of this particular PizzaServer (in $). */
  double balance = 0.0;
  
  
  /** Ask this particular PizzaServer about their salary.
   * @return This PizzaServer's salary (in $/hr). 
   */
  double getSalary() {
    return this.salary;
    }   

  /** Set this particular PizzaServer's salary.
   * @param newSalary  The new salary for this employee (in $/hr).
   */
  void setSalary( double newSalary ) {
    this.salary = newSalary;
    }
  
  /** Ask this particular PizzaServer about their balance.
   * @return This PizzaServer's balance (in $). 
   */
  double getBalance() {
    return this.balance;
    }   

  /** Set this particular PizzaServer's balance.
   * @param newSalary  The new balance for this employee (in $).
   */
  void setBalance( double newBalance ) {
    this.balance = newBalance;
    }
  


  
  /** 
   * 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:
   * <br> pizzaArea( 0) =  0
   * <br> pizzaArea( 2) =~ 3.14
   * <br> pizzaArea(20) =~ 314.0
   * 
   * <br> pizzaArea( 4) =~ 12.52
   * <br> pizzaArea(16) =~ 201.5ish
   */
  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> crustArea( 6) = pizzaArea( 6) - 0 =~ 28.16
   * <br> crustArea(20) = pizzaArea(20) - pizzaArea(14) =~ 314 - 153.86 = 160.14ish
   */
  double crustArea( double diam ) {
    return pizzaArea(diam) - pizzaArea( diam - 2*3 );
    }


  }