7. Reverse Integer

Reverse digits of an integer.

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

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解决代码：

class Solution {public:    int reverse(int x) {        long long temp = abs((long long)x);        long long curr = 0;        while (temp)        {            curr = curr * 10 + temp % 10;            if (curr > INT_MAX)            {                return 0;            }            temp /= 10;        }        if (x >= 0)            return curr;        else            return -curr;    }};