[LeetCode] Reverse Integer

暫時不考慮溢出的問題。

class Solution {
public:
    int reverse(int x) {
        int result = 0;
        while(x != 0) {
            result *= 10;
            result += x % 10;
            x /= 10;
        }
        if (x < 0) {
            result *= -1;
        }
        return result;        
    }
};