Easy 2 Reverse Integer（7）

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

click to show spoilers.

Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.

Subscribe to see which companies asked this question.

Solution
转换过程很简单，主要是溢出的判断（依据时，如果计算过程溢出，则是运算是不可逆的）。

class Solution {public:    int reverse(int x) {        int res=0;        int ress=0;        while(x){            ress=res*10+x%10;            if(res!=(ress/10)) return 0;//溢出的判断            res=ress;            x=x/10;        }       return res;    }};