(Sum the digits in an integer) Write a method that computes the sum of the digits in an integer. Use the following method header:

/*
(Sum the digits in an integer) Write a method that computes the sum of the digits
in an integer. Use the following method header:

public static int sumDigits(long n)

For example, sumDigits(234) returns 9 (2 + 3 + 4). (Hint: Use the % operator
to extract digits, and the / operator to remove the extracted digit. For instance,
to extract 4 from 234, use 234 % 10 (= 4). To remove 4 from 234, use 234 / 10
(= 23). Use a loop to repeatedly extract and remove the digit until all the digits
are extracted. Write a test program that prompts the user to enter an integer and
displays the sum of all its digits.
*/
import java.util.Scanner;

public class Exercise_06_02 {
	/** Main Method */
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in); // Create a Scanner

		// Prompt the user to enter an integer
		System.out.print("Enter a integer: ");
		long number = input.nextLong();

		// Display the sum of all the digits in the integer
		System.out.println("The sum of the digits in " + number + " is " +
			sumDigits(number));
	}

	/** Compute the sum of the digits in an integer */
	public static long sumDigits(long n) {
		int sum = 0;
		while (n > 0) {
			sum += n % 10;
			n /= 10;
		}

		return sum;
	}
}