【Java】利用递归计算一个数字的各位数字和

import java.util.Scanner;
public class test48{
	public static void main(String args[]) {

	    Scanner in = new Scanner(System.in);
	    int a = in.nextInt();
	    System.out.println(fn(a));

}
	public static int fn(int n) {
	    if (n == 0) 
	    	return 0;
	    else 
	        return n%10 + fn(n/10);
	}
}