# Power of two

Given an integer, write a function to determine if it is a power of two.

Example 1:

```
Input: 1
Output: true
Explanation: 2 pow 0 = 1
```

Example 2:

```
Input: 16
Output: true
Explanation: 2 pow 4 = 16
```

Example 3:

```
Input: 218
Output: false
```

## Solution

If a number is power of 2, then its high bit is `1`

and there is only one `1`

. Therefore, `number & (number-1)`

is `0`

.

```
fun isPowerofTwo(n: Int): Boolean {
return (n>0).and((n and (n-1)) == 0)
}
```