Q4

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

 Example 4:

 Input: x = 0

 Output: 0 

 Constraints: -231 <= x <= 231 - 1