class Pizzeria extends Object120 {


    /* Return the area of a pizza with a given diameter, `diam`.
     * `diam` must be non-negative number of inches;
     * the result is in square-inches.
     */
    static double pizzaArea( double diam ) {
       // declare a local variable 'rad'
       double rad;
       rad = diam/toDouble(2);
       return Math.PI * Math.pow(rad,2.0);  
    }


  
    /* unit tests */
    static void testPizzaArea() {
        System.out.println( "Actual: " + pizzaArea( 20 ) );
        System.out.println( "Desire: " + 314.1592653589793238643383279 );
   
        System.out.println( "Actual: " + pizzaArea(14) );
        System.out.println( "Desire: " + 154.9 );
   
        System.out.println( "Actual: " + toString( pizzaArea(toDouble(14)) ) );
        System.out.println( "Desire: " + toString( 154.9 ) );
   
        System.out.println( "Actual: " + pizzaArea(0) );
        System.out.println( "Actual: " + 0.0 );
        return;
    }
}