Run the following program:
import java.util.Scanner;
/** Project1.java by
*/
public class Project1
{
public static void main(String[] args)
{
final double PI = 3.1428;
Scanner keyboard = new Scanner(System.in);
System.out.print("Think of a planet and enter its + "radius in miles: ");
double radius = keyboard.nextDouble();
double volume = 4.0 * PI * radius * radius * radius / 3.0;
double earthVolume = 4.0 * PI * 3963 * 3963 * 3963 / 3.0;
double proportion = volume / earthVolume;
System.out.println();
System.out.println("Your planet has a radius of " + radius +" miles");
System.out.println("and has a volume of " + volume + " cubic miles.");
System.out.println("This volume is " + proportion + " times the earth's volume.");
} // end main
} // end Project1
Now make the following changes to the program and run it again:
• Add comments to the program to make it more readable.
• The value of the constant PI is incorrect. Correct this value rounded to four decimal places.
• Replace the unnamed constant 3963 with a named constant. It represents the earth’s radius in miles.
• Compute the surface area of the planet and display it. The surface area of a sphere of radius r is 4 π r2.