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# 7. Reverse Integer

## Medium

***

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`