import java.util.Scanner;

/**
 * This program takes a number from the user and calculates the volume of a
 * sphere with that radius
 * 
 * @author Steven Karas
 */
public class Volume {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		/*
		 * I could have declared all the variables at the top. This is a
		 * convention thing. So long as you are consistent (only doing one or
		 * the other), it is acceptable.
		 * 
		 * Styling conventions are used to enhance the readability of our code.
		 * For example, single line comments are actual comments for this class.
		 * Block comments, like these, describe alternative ways to complete the
		 * section, or provide an indepth explanation.
		 */
		// Get the radius from the user
		System.out.print("Enter a radius: ");
		double radius = scan.nextDouble();

		/*
		 * You could have used Math.pow instead of multiplying three times.
		 * 
		 * Note that 4.0 and 3.0 include the decimals. Otherwise it is treated
		 * by Java as integers, and 4 / 3 as integers is 1.
		 */
		// formula for the volume of a sphere (as given)
		double volume = (4.0 / 3.0) * Math.PI * radius * radius * radius;

		/*
		 * This could have been split up over several lines, with multiple calls
		 * to System.out.print, instead.
		 */
		System.out.println("The volume of a sphere with radius " + radius
				+ " is " + volume);
	}

}