回文数（3.13 leetcode每日打卡）

 1 bool isPalindrome(int x)
 2 {
 3     long tem;
 4     long n = 0;
 5     int ans = 0;
 6 
 7     tem = x;
 8     if(x < 0)
 9     return false;
10     
11     while(tem != 0)
12     {
13         ans = tem%10;
14         n = n*10 + ans;
15         tem = tem/10;
16     }
17 
18     if(n == x)
19     return true;
20     else
21     return false;
22 }