231. Power of Two

Given an integer n, return true if it is a power of two. Otherwise, return false.

An integer n is a power of two, if there exists an integer x such that n == 2x.

Example 1:

Input: n = 1
Output: true
Explanation: 20 = 1

Example 2:

Input: n = 16
Output: true
Explanation: 24 = 16

Example 3:

Input: n = 3
Output: false

Example 4:

Input: n = 4
Output: true

Example 5:

Input: n = 5
Output: false

Constraints:

• -231 <= n <= 231 - 1

Follow up: Could you solve it without loops/recursion?

public class Solution {
    public bool IsPowerOfTwo(int n) {
      if(n <= 0)
        return false;
      char[] charlist = Convert.ToString(n,2).ToCharArray();
      var count = 0;
      foreach (char elem in charlist){
        if(elem == '1'){
          count += 1;
        }
      }
      return count == 1 ? true : false;
    }
}