to check if it is power of 2 or not

class Solution {
public:
    bool isPowerOfTwo(int n) {
        int count =0;
        if(n<0)
        {
            return 0;
        }
        while(n)
        {
          n&=n-1;
          count = count +1;
        }
        if(count ==1){
            return 1;
        }
        else{
            return 0;
        }
    }
};