class Solution {
    public int reverse(int x) {
        long result = 0;
        while(x != 0){
            long low = x%10;
            x = x/10;
            result = result * 10 + low;
        }

        // [-2^31,2^31-1]
        if(result > Integer.MAX_VALUE || result < Integer.MIN_VALUE) return 0;

        return (int)result;
    }
}