leetcode-9. Palindrome Number

leetcode

Question

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

Example

NULL

Tip

输入一个数，判断其是否为回文数

将数字“反过来”与原值进行比较

考虑负数的情况，负数不算回文数

Code

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class Solution {
public:
    bool isPalindrome(int x) {
        long long init = x;
        long long result = 0;
        while(x) {
            result = result * 10 + x % 10;
            x /= 10;
        }
        return init == result && init >= 0 ? true : false;
    }
};