Reverse Integer

class Solution {public:    int reverse(int x) {        bool negative=x<0?true:false;        long long xx=x;        if(negative)        {            xx=-xx;        }        long long res=0;        while(xx)        {            int tmp=xx%10;            res*=10;            res+=tmp;            xx=xx/10;            if(res>((1<<31)-1))            {                return 0;            }        }        if(negative)        {            return -res;        }        else        {            return res;        }    }};