Reverse Integer

注意处理overflow和negative的问题。

class Solution {public:    int reverse(int x) {        bool positive = (x>=0);        x = abs(x);                int result = 0;                for(; x; x/=10)        {            result = result*10 + x%10;        }        if(result < 0)            return -1;                return positive?result:(0-result);    }};

class Solution {public:    int reverse(int x)     {        bool negative = (x<0);        if(x < 0) x = 0-x;        if(x < 0) return 0;                int result = 0;                while(x != 0)        {            if(result > INT_MAX/10)                return 0;            if(result == INT_MAX/10 && (x%10) > (INT_MAX%10))                return 0;            result = result*10+(x%10);            x /= 10;        }        return negative?(0-result):(result);    }};