power-of-two

Power of two

Complete the function power_of_two/powerOfTwo (or equivalent, depending on your language) that determines if a given non-negative integer is a power of two. From the corresponding Wikipedia entry:

a power of two is a number of the form 2ⁿ where n is an integer, i.e. the result of exponentiation with number two as the base and integer n as the exponent.

You may assume the input is always valid.

Examples

PowerOfTwo.isPowerOfTwo(1024) // -> true
PowerOfTwo.isPowerOfTwo(4096) // -> true
PowerOfTwo.isPowerOfTwo(333)  // -> false

Beware of certain edge cases - for example, 1 is a power of 2 since 2^0 = 1 and 0 is not a power of 2.