## Determine if a positive integer is a power of two.

```C
bool isPowerOfTwo(int n) {
    if (n <= 0)
        return false;

return !(n & (n - 1));
}
```

### Explanation
- This function checks if a given positive integer `n` is a power of two. 
- It utilizes a bitwise operation to confirm whether `n` has only one bit set in its binary representation.