/** Planet.java -- this file will define the attributes and operations for
 * a Planet object.  Sept. 17, 2002.
 */

public class Planet
{
    // attributes
    double radius;
    double percentWater;

    /** initial value constructor takes a radius and percent water */
    public Planet (double r, double p)
    {
        radius = r;
	percentWater = p;
    }

    /** operations -- define functions that find the volume of the planet
     * as well as land area
     * We assume that the planet is in the shape of a sphere.
     */
    double findVolume()
    {
        return (4.0/3.0) * Math.PI * Math.pow (radius, 3.0);
    }

    double findLandArea()
    {
        double totalArea = 4.0 * Math.PI * radius * radius;
	double landArea = totalArea - percentWater / 100.0 * totalArea;
	return landArea;
    }
}