Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

Input: 123Output:  321

Example 2:

Input: -123Output: -321

Example 3:

Input: 120Output: 21

class Solution {    public int reverse(int x) {        long tmp = x <= Integer.MIN_VALUE ? 0 : x;        long rst = 0, div = 10, tag = x & 0x80000000, val = 0 != tag ? ~tmp + 1 : tmp;                while (val / div > 0) {        	rst = rst * 10 + (val % div) / (div / 10);        	div *= 10;        }                rst = rst * 10 + (val % div) / (div / 10);                return (int) (0 != tag ? (~rst + 1 < Integer.MIN_VALUE ? 0 : ~rst + 1) : rst < Integer.MAX_VALUE ? rst : 0);    }}