/**
 * @author Mark Davis
 * @version 11/22/2013
 */
import java.util.Scanner;
import java.io.File;
import java.io.IOException;

public class Weight
{
    static final double G = 6.67 * Math.pow(10,-17);

    public static void main(String[] args)throws IOException
    {

        // Extension idea... instead of hard codeing the weight, you may propt the user for input.

        double earthWeight = 100.0; // initalize Earth weight to 100 lbs.

        String[] names = {"Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto"};
        double[] gravity = getGravity();                            // static method you write
        double[] weight = calcWeight(earthWeight, gravity);  // static method you write
        printResults(names, gravity, weight);                   // static method you write

    }

    public static double[] getGravity()
    {

        double[] radii = {2439.7, 6051.9, 6378, 3402.5, 71492, 60270, 25562, 24774, 1195};
        double[] masses = {3.3022 * Math.pow(10,23), 4.8685 * Math.pow(10,24), 5.9736 * Math.pow(10,24), 6.4185 * Math.pow(10,23), 1.8986 * Math.pow(10,27), 5.6846 * Math.pow(10,26), 8.6810 * Math.pow(10,25), 1.0243 * Math.pow(10,26), 1.312 * Math.pow(10,22)};
        double gravities[] = new double[radii.length];
        for (int i = 0; (i <= radii.length -1); i++)
        {
            double result = calcGravity(radii[i], masses[i]);
            gravities[i] = result;
        }
        return gravities;
    }

    public static double calcGravity(double radius, double mass)
    {
        return (G * mass)/Math.pow(radius, 2.0);

    }

    public static double[] calcWeight(double earthWeight, double[] gravity)
    {
        double[] weight = new double[gravity.length];

        for (int i = 0; (i <= gravity.length -1); i++)
		{
			weight[i] = (earthWeight / G) * gravity[i];
		}
		return weight;
    }

    public static void printResults(String[] a, double[] b, double[] c)
    {
        System.out.printf("%7s %7s %22s", "Names", "Gravity", "Weights");

        for (int i = 0; (i <= a.length -1); i++)
		{
		    System.out.println();
		    System.out.printf("%7s %7.2f %22.0f", a[i], b[i], c[i]);
		}
		System.out.println();

    }
}