LeetCode 7. Reverse Integer

class Solution {
public:
    int reverse(int x) {
        int rev = 0;
        while (x != 0) {
            if (rev < INT_MIN / 10 || rev > INT_MAX / 10)
                return 0;
            rev = rev * 10 + x % 10;
            x /= 10;
        }
        return rev;
    }
};