LeetCode算法入门- Palindrome Number-day2
LeetCode算法入门- Palindrome Number-day2
Palindrome Number
Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.
Example 1:
Input: 121
Output: true
Example 2:
Input: -121
Output: false
Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
Example 3:
Input: 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
方法一：
将int类型x进行反转，如果反转之后和之前的数字一样，说明是回文，否则不是（记得排除负数的）
class Solution {public boolean isPalindrome(int x) {if(x < 0) return false;//这里是将int类型X进行反转int reverse = 0;int old = x;while(x != 0){reverse = reverse * 10 + x % 10;x = x / 10;}return reverse == old;}
}
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