public class Playing extends JPFalt
{
    public static void main(String[] args)
    {
        new Playing();
    }

    double areaOfDisk (double radius)
    {
        final double PI = 3.14159;
    
        return (PI * radius * radius);
    }
    
    void areaOfDiskTests()
    {
        testHeader("areaOfDisk");
        
        expected(3.14159);
        actual( areaOfDisk(1) );
        
        expected(102.0702591);
        actual( areaOfDisk(5.7) );
        
    }
}