7. Reverse Integer

Reverse digits of an integer.

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

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public class Solution {    public int reverse(int x) {long res = 0; while (x != 0) { res = res * 10 + x % 10; x /= 10; } if (res > Integer.MAX_VALUE || res < Integer.MIN_VALUE) { return 0; } return (int) res;    }}