/*CMPS161
 *Program Assignment 06
 *
 *
Page 234
6.2 (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
   use 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 Exercise6_2 {
	public static void main(String[] args) {
      // Enter a postive integer: Scanner(System.in)
		Scanner input = new Scanner(System.in);
		System.out.println("Enter a positive integer: ");
		int userInput = input.nextInt();
		//Call method sumDigits and then display the result
		sumDigits (userInput);
		System.out.println(userInput);
	}
// end of main

	public static int sumDigits(int n) {
		int temp = (int)Math.abs(n);	// temp value
		int sum = 0;	// the sum of the digits

		while (sum > 0) {
			sum = sum + temp % 10;
			temp = temp / 10;

		System.out.print(sum);


	}
		return sum;
	}
}










		/*int temp = (int)Math.abs(n);	// temp value
		int sum = 0;	// the sum of the digits

		// while (loop until all the digits are extracted) {
			// extract a digit (%)
			input % 10
			// add the extracted digit into sum
			// remove the extracted digit (/)

		// }
		// return the sum of the digits
		return sum;
	}	// end of sumDigits
} // end of Exercise6_2

/* Sample Run
   Enter a  number: 234
   The sum of digits for 234 is 9
*/