class Circle
{
    public static final double PI = 3.14;
    
    public Circle( double rad, String col )
    {
        if( rad < 0 )
        {
            System.out.println( "Error constructing Circle" );
            return;
        }
        
        radius = rad;
        color = col;
    }
    
    public Circle( String color )
    {
        this( 0, color );
    }
    
    public Circle( double rad )
    {
        this( rad, "RED" );
    }
    
    public Circle( )
    {
        this( 0 );
    }
    
    public double getArea( )
    {
        return PI * radius * radius;
    }
    
    public double getPerimeter( )
    {
        return 2 * PI * radius;
    }
    
    public double getRadius( )
    {
        return radius;
    }
    
    public void setRadius( double newRadius )
    {
        if( newRadius < 0 )
        {
            System.out.println( "Error setting radius" );
            return;
        }
        
        radius = newRadius;
    }
    
    public void expand( double factor )
    {
        if( factor < 0 )
        {
            System.out.println( "Error setting radius" );
            return;
        }
        
        radius *= factor;
    }
    
    public boolean equals( Object other )
    {
        // Is other a Circle? If NO ===> return false
        if( ( other instanceof Circle ) == false )
            return false;
        
        // Compare radius fields
        Circle otherCircle = (Circle) other;
        if( radius == otherCircle.radius
                && color.equals( otherCircle.color ) )
            return true;
        else
            return false;
        
    }
    
    public String getColor( )
    {
        return color;
    }
    
    public String toString( )
    {
        return "Circle with radius " + radius + " and color " + color;
    }
    
    
    // Data representation
    private double radius;
    private String color;
}

class Day02
{
    public static double getTotalArea( Circle [ ] arr )
    {
        double sum = 0.0;
        
        for( Circle c : arr )  // Enhanced for loop
            sum += c.getArea( );
        
        return sum;
    }
    
    
    public static void main( String [ ] args )
    {
        Circle [ ] arr =
            { new Circle( ), new Circle( 2, "BLUE" ),
              new Circle( 4 ), new Circle( "GREEN") };
        
        Circle c1 = new Circle( 2 );
        
        for( Circle c : arr )
            System.out.println( c );
        
        System.out.println( "Total area is " + getTotalArea( arr ) );
        
        if( c1.equals( arr[ 1 ] ) )
            System.out.println( "Circles are equal" );
        else
            System.out.println( "Circles are not equal" );
        
    }
    
    
}