题解 | #数字颠倒#

题目 数字颠倒

日期 2022/03/17

思路

用取余法将数字从后开始加入一个StringBuffer

代码

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        System.out.println(numTostr(num));
    }
    public static String numTostr(int num){
        StringBuffer sb = new StringBuffer();
        if(num==0)
            return "0";
        while(num!=0){
            int yu = num%10;
            char ch = (char) ('0'+yu);
            sb.append(ch);
            num/=10;
            //System.out.println("yu:"+yu+" char:"+('0'+yu)+" sb:"+sb+" num:"+num);
        }
        return sb.toString();
    }
}