201512-1 数位之和 Java

思路：

mod 10获取最低位，除以10去掉最低位

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int sum = 0;
		while(n>0) {
			sum = sum + n%10;
			n = n/10;
		}
		sc.close();
		System.out.println(sum);
	}
}