/** Functions to calculate the area of pizza purchased, given a diameter.
 *
 * @author Ian Barland
 */
class Pizzeria extends Object120 {

    static double pizzaArea( double diam ) {
        double r;
        r = diam/2;
        return Math.PI * r * r;
    }

    
    /** The amount of crust (in sq. in) on a pizza of the given diameter.
     * Our pizzeria uses 3" crust, all the way around.
     * @param d the diameter of the pizza.  Must be >= 6.
     * @return The amount of crust (in sq. in) on a pizza of diameter `d`.
     */
    static double crustArea_v1( double d ) {
        double totalArea;
        totalArea = Math.PI * d/2 * d/2;
        
        double toppingArea;
        toppingArea = Math.PI * (d-6)/2 * (d-6)/2 ;
        
        return totalArea - toppingArea ;
    }
    
    static double crustArea( double d ) {
        return (Math.PI * d/2 * d/2) - (Math.PI * (d-6)/2 * (d-6)/2);
    }
    
    static double crustArea_v3( double d ) {
        return pizzaArea(d) - pizzaArea(d-6);
    }
    
    static double crustArea_v4( double d ) {
        double totalArea;
        totalArea = pizzaArea(d);
        
        double toppingArea;
        toppingArea = pizzaArea(d-6);
        
        return totalArea - toppingArea ;
    }
    
    
    static void testPizzeria() {
        System.out.println( "The area of a 20-inch pizza:" );
        System.out.println( "Actual: " + pizzaArea(20) );
        System.out.println( "Expect: 314 (approx)" );
        System.out.println( "" );

        System.out.println( "The area of a 0-inch pizza:" );
        System.out.println( "Actual: " + pizzaArea(0) );
        System.out.println( "Expect: 0" );
        System.out.println( "" );

        System.out.println( "The area of a 2-inch pizza:" );
        System.out.println( "Actual: " + pizzaArea(2) );
        System.out.println( "Expect: 3.14 (approx)" );
        System.out.println( "" );
        
        

        System.out.println( "The crust on a 6-inch pizza:" );
        System.out.println( "Actual: " + crustArea(6) );
        System.out.println( "Expect: 28.27 (approx)" );
        System.out.println( "" );

        System.out.println( "The crust on a 26-inch pizza:" );
        System.out.println( "Actual: " + crustArea(26) );
        System.out.println( "Expect: 216.8 (approx)" );
        System.out.println( "" );

        System.out.println( "The crust on a 14-inch pizza:" );
        System.out.println( "Actual: " + crustArea(14) );
        System.out.println( "Expect: 103.67\"sq (approx)" );
        System.out.println( "" );
        
        
        System.out.println( "Buffet price for 1 person:" );
        System.out.println( "Actual answer: " + buffetPrice(1) );
        System.out.println( "Expect answer: 8.00" );
        
        System.out.println( "Buffet price for 2 people:" );
        System.out.println( "Actual answer: " + buffetPrice(2) );
        System.out.println( "Expect answer: 12.50" );
        
        System.out.println( "Buffet price for 11 people:" );
        System.out.println( "Actual answer: " + buffetPrice(11) );
        System.out.println( "Expect answer: 53.00" );
        
        System.out.println( "========" );
        
    }

    static double buffetPrice( int numCusts ) {
        return 8 + (numCusts-1)*4.5;
    }
    
    
    
}