abstract class Shape
{
    // Placeholder
    abstract public double getArea( );
}

class Circle extends Shape
{
    public static final double PI = 3.14;
    
    public Circle( double r )
    {
        radius = r;
    }
    
    public String toString( )
    {
        return "Circle with radius " + radius;
    }
    
    public double getArea( )
    {
        return PI * radius * radius;
    }
    
    private double radius;
}


class Rectangle extends Shape
{
    public Rectangle( double len, double wid )
    {
        length = len;
        width = wid;
    }
    
    public double getArea( )
    {
        return length * width;
    }
    
    public String toString( )
    {
        return "Rectangle with dimensions " + length + "*" + width;
    }
    
    double length;
    double width;
}


/** OPTION #1
class Square extends Shape
{
    public Square( double s )
    {
        side = s;
    }

    public String toString( )
    {
        return "Square with side " + side;
    }
    
    public double getArea( )
    {
        return side * side;
    }
    
    private double side;
}
 **/

/** OPTION #2
 */
class Square extends Rectangle
{
    public Square( double s )
    {
        super( s, s );
    }
}

class Day11
{
    public static double getTotalArea( Shape [ ] arr )
    {
        double sum = 0.0;
        
        for( Shape s : arr )
            sum += s.getArea( );
        
        return sum;
    }

    public static void printArray( Object [ ] arr, String str )
    {
        for( int i = 0; i < arr.length; i++ )
            System.out.println( str + "[" + i + "] = " + arr[ i ] );
    }
    
    public static void main( String [ ] args )
    {
        Circle [ ] arr1 = { new Circle( 2 ), new Circle( 4 ) };
        Square [ ] arr2 = { new Square( 2 ), new Square( 4 ) };
        
        printArray( arr1, "Circle" );
        System.out.println( "Total area is: " + getTotalArea( arr1 ) );
        
        printArray( arr2, "Square" );
        System.out.println( "Total area is: " + getTotalArea( arr2 ) );
     
        Shape [ ] arr3 = { arr1[ 0 ], arr2[ 0 ],
                        arr1[ 1 ], arr2[ 1 ], new Rectangle( 4, 5 ) };
        printArray( arr3, "Shape" );
        System.out.println( "Total area is: " + getTotalArea( arr3 ) );
        
    }
    
}