abstract class Shape
{
    abstract public double getArea( );
    abstract public double getPerimeter( );
    
    public double semiPerimeter( )
    {
        return getPerimeter( ) / 2.0;
    }
}

class Circle extends Shape
{
    public Circle( double r )
    {
        radius = r;
    }
    
    public String toString( )
    {
        return "Circle " + radius;
    }
    
    public double getArea( )
    {
        return 3.14 * radius * radius;
    }
    
    public double getPerimeter( )
    {
        return 2 * 3.14 * radius;
    }
    
    private double radius;
}
    
class Square extends Shape
{
    public Square( double s )
    {
        side = s;
    }
    
    public String toString( )
    {
        return "Square " + side;
    }
    
    public double getPerimeter( )
    {
        return 4 * side;
    }
    
    public double getArea( )
    {
        return side * side;
    }
    
    private double side;
}
  
class Rectangle extends Shape
{
    public Rectangle( double len, double wid )
    {
        length = len;
        width = wid;
    }
    
    public double getPerimeter( )
    {
        return 2 * ( length + width );
    }
    
    public String toString( )
    {
        return "Rectangle " + length + "*" + width;
    }
    public double getArea( )
    {
        return length * width;
    }
    private double length;
    private double width;
}

public class Day4a 
{
    public static void printArray( Object [ ] arr )
    {
        for( int i = 0; i < arr.length; i++ )
            System.out.println( "arr[" + i + "]=" + arr[ i ].toString( ) );
    }
    
    public static double totalArea( Shape [ ] arr )
    {
        double sum = 0.0;
        
        for( Shape s : arr )
            sum += s.getArea( );
        
        return sum;
    }
      
    
    public static void main( String [ ] args )
    {
        Shape [ ] arr = { new Circle( 2 ), new Square( 1 ), new Circle( 3 ),
                            new Rectangle( 3, 5 ), new Rectangle( 4, 7 ),
                           new Square( 2 ), new Circle( 1 ), new Square( 3 ) };
        
        printArray( arr );
        
        System.out.println( "Total of area is: " + totalArea( arr ) );
        
    }
    
    
}