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 in = new Scanner(System.in);
        int num = in.nextInt();
        int count = (int)Math.log10(num) + 1;//计算是几位数
        if(num ==0){
             System.out.print(num);
        }
        else{
            for(int i  = 0;i < count ;i++){//倒序输出
            System.out.print(num%10);
            num = num/10;
        }
        }
        }
        
    }