PU Reverse Integer

int reverse(int x) {
    if (x == INT_MIN) return 0;
    int sign = 1;
    if (x < 0) {
        sign = -1;
        x = -x;
    }
    int limit = INT_MAX / 10, _limit = INT_MAX % 10;
    int res = 0;
    while (x && res < limit) {
        res = res * 10 + x % 10;
        x /= 10;
    }
    if (!x) return res * sign;
    if (res > limit) return 0;
    if (x > _limit) return 0;
    return (res * 10 + x) * sign;
}