题解 | 反向输出一个四位数

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 in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        int n = in.nextInt();

//获取倒立数
        int high = n / 100;
        int highhigh = high / 10;
        int highlow = high % 10;
        int low = n % 100;
        int lowhigh = low / 10;
        int lowlow = low % 10;
        int daoli = lowlow * 1000 + lowhigh * 100 + highlow * 10 + highhigh;
        int temp = daoli;

        //使用变量表示相对应的位数
        int i = 0;
        while (temp > 0) {
            temp = temp / 10;
            i++;
        }



        for (int j = 4 - i; j > 0; j--) {
            System.out.print(0);
        }
        System.out.print(daoli);


    }
}