7. Reverse Integer

description:

Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

Input: 123
Output: 321
Example 2:

Input: -123
Output: -321
Example 3:

Input: 120
Output: 21

my answer:

感恩

class Solution {
public:
    int reverse(int x) {
        int res = 0;
        while(x!=0){
            if(abs(res) > INT_MAX/10) return 0;
            res = res*10 + x%10; //this forum is important and i can't get it before i saw it ....
            x /= 10;
        }
        return res;
    }
};

relative point get√：

hint :

关键在于处理溢出情况