/**
 * class PizzaServer, version 3.
 *
 * A PizzaServer knows how to answer basic
 * questions about the area of pizzas.
 * Also, this version adds a salary, and uses javadoc comments.
 *      
 * @author Ian Barland
 * @version 3, having added a salary field. 
 */
class PizzaServer {
 
  /** The width of crust all the way around the edge of a pizza. */
  final double CRUST_WIDTH = 2.0;
    
  /** Minimum wage, in $/hr.  (Should be defined in some other class, gov.deptOfLabor ?) */
  final double MINIMUM_WAGE = 5.15;
  
  
  /** The salary of this particular PizzaServer (in $/hr). */
  double salary = MINIMUM_WAGE;
  
  
  /** Ask this particular PizzaServer about their salary.
   * @return This PizzaServer's salary (in $/hr). 
   */
  double getSalary() {
    return salary;
    }   

  /** 
   * Set this particular PizzaServer's salary.
   * @param newSalary  The new salary for this employee (in $/hr).
   */
  void setSalary( double newSalary ) {
    salary = newSalary;
    }
  
  
  
  /** 
   * 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> pieArea( 0) =  0
   * <br> pieArea( 2) =~ 3.14
   * <br> pieArea(20) =~ 314.0
   * 
   * <br> pieArea( 4) =~ 12.52
   * <br> pieArea(16) =~ 201.5ish
   */
  double pieArea( double diam ) {
    final 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( 4) = pieArea( 4) =~ 12.52
   * <br> crustArea(20) = pieArea(20) - pieArea(16) =~ 314 - 201.5ish = 112.5ish
   */
  double crustArea( double diam ) {
    return pieArea(diam) - pieArea( diam - 2*CRUST_WIDTH );
    }

  }