7. Reverse Integer

Reverse digits of an integer.

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

click to show spoilers.

Note: The input is assumed to be a 32-bit signed integer. Your
function should return 0 when the reversed integer overflows.

public class Solution {    public int reverse(int x) {        long res = 0;        int remainder = 0;        while(x != 0){            remainder = x%10;            res = 10*res + remainder;            x /= 10;        }        if(Math.abs(res) > (1<<31) -1) return 0;        return (int)res;    }}