Power Of Two

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

Example 1:

Input: 1
Output: true
Example 2:

Input: 16
Output: true
Example 3:

Input: 218
Output: false

Power Of Two Solution

class PowerOfTwo {
    public boolean isPowerOfTwo(int n) {
        long i = 1;
        while(i < n) {
            i <<= 1;
        }

        return i == n;
    }
}