# Check Power of Two

Given an integer `n`

greater than or equal to `0`

, return whether it is a power of two.

**Constraints**

`0 ≤ n < 2 ** 31`

https://binarysearch.com/problems/Check-Power-of-Two

## Examples

### Example 1

**Input**

- n =
`2`

**Output**

- answer =
`True`

**Explanation**

2^1 = 2

### Example 2

**Input**

- n =
`0`

**Output**

- answer =
`False`

### Example 3

**Input**

- n =
`1`

**Output**

- answer =
`True`

**Explanation**

2^0 = 1

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