Reverse Integer

Reverse digits of an integer.

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

Solution: first count the number of digits, then reverse it. Overflow is not considered.

Following code passes LeetCode Online Large Judge. 

class Solution {
public:
    int reverse(int x) {
        int result = 0, tmp = abs(x);
        bool sign = (x > 0);
        while(tmp > 0) {
            result *= 10;
            result += tmp % 10;
            tmp /= 10;
        }
        if(!sign) result = -1*result;
        return result;
    }
};