输入123，打印1 2 3（两种方法）

import java.util.Scanner;
public class test72 {
    /**
     *
     * @param args
     */
    public static void num(int n) {
        if(n > 9) {
            num(n/10);
        }
        System.out.println(n%10);
    }
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();

        while(n != 0) {
            int a = n %  10;
            System.out.println(a);
            n /= 10;
        }
        num(123);
    }
}