0007. Reverse Integer

https://leetcode.com/problems/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

Example 4:

**Input:** x = 0
**Output:** 0

Constraints:

• -231 <= x <= 231 - 1

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