Leetcode 3——Palindrome Number(回文数)

Problem:

Determine whether an integer is a palindrome. Do this without extra space.

简单的回文数,大一肯定有要求写过,不过从基础开始尝试吧。

Solution:

public class Solution {
    public boolean isPalindrome(int x) {
        int n=1;
        int copyx=x;
        if(x<0)return false;
        if(x<10)return true;
        while(x>=10){
            x=x/10;
            n++;
            if(x<10)break;
        }
       
        if(n%2==0)
        {
            while(copyx/(int)Math.pow(10,n-1)==copyx%10)
            {
                copyx=copyx%(int)Math.pow(10,n-1);
                copyx=copyx/10;
                // if(x==0)return true;
                n=n-2;
                if(n==0)return true;
                
            }
        }
        if(n%2==1)
        {
            while(copyx/(int)Math.pow(10,n-1)==copyx%10)
            {
                copyx=copyx%(int)Math.pow(10,n-1);
                copyx=copyx/10;
                // if(x==0)return true;
                n=n-2;
                if(n==1)return true;
                
            }
        }
        return false;
    }
}
原文地址:https://www.cnblogs.com/GoForMyDream/p/6106153.html