leetcode Reverse Integer

Javascipt version

Javascript have the function that reverse the String, so it is pretty easy to do in js.

/**
 * @param {number} x
 * @return {number}
 */
var reverse = function(x) {
    var y = parseInt(x.toString().split('').reverse().join(''))
    if (y >= 2**31-1 || -y <= -(2**31)) return 0;
    return x < 0 ?  -y : y
}

Java version

This java version is not prefect through, I have not handle the overflow.

public class Solution {
    public static int reverse(int x) {
        int result = 0;
        if(x == 10){return 1;}
        while (x!=0){
            int tail = x % 10;
            int newResult = result * 10 + tail;
            result =newResult;
            x = x /10;
        }
        return result;
    }
    public static void main(String[] args){
        System.out.print(reverse(123));
    }
}