SumOfDigits.java

import java.util.Scanner;

public class SumOfDigits {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		System.out.println("Enter a number between 0 and 1000");

		int n = sc.nextInt();

		if (n > 0 && n < 1000) {

			int sum = 0;

			while (n > 0) {

				sum = sum + n % 10;
				n = n / 10;
			}

			System.out.println("Sum of digits is: " + sum);
			
		} else {
			
			System.out.println("INVALID INPUT: Enter a valid number between 0 and 1000");
		
		}

		sc.close();
	}

}