Reverse Integer
Description
Given a signed 32-bit integer x
, return x
with its digits reversed. If reversing x
causes the value to go outside the signed 32-bit integer range [-231, 231 - 1]
, then return 0
.
Assume the environment does not allow you to store 64-bit integers (signed or unsigned).
Example 1:
Input: x = 123 Output: 321
Example 2:
Input: x = -123 Output: -321
Example 3:
Input: x = 120 Output: 21
Constraints:
-231 <= x <= 231 - 1
Solution(javascript)
/**
* @param {number} x
* @return {number}
*/
var reverse = function(x) {
var reverseX = parseInt(x.toString().split('').reverse().join(''));
if (reverseX < (Math.pow(2, 31) * -1) || reverseX > Math.pow(2, 31) - 1) return 0;
return reverseX* Math.sign(x);
};