题解 | #数字颠倒#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
        int nextInt = sc.nextInt();
        String result = new String();
        while (nextInt != 0){
            Integer x = nextInt % 10;
            result = result + x.toString();
            nextInt = nextInt / 10;
        }
        System.out.println(result.equals("") ? 0 : result);
    }
}