231. Power of Two

Practice Power of Two for free on NudgeCode: Easy, Bit Manipulation pattern. Write it in Python or JavaScript, run the tests in your browser, and ask for a hint when you are stuck.

Return true if the signed 32-bit integer n equals 2^k for some integer k >= 0, and false otherwise. Zero and negative numbers are never powers of two.

Example

n = 1    ->  true    (2^0)
n = 16   ->  true    (2^4)
n = 6    ->  false
n = -16  ->  false

Constraints

• -2^31 <= n <= 2^31 - 1