Number Complement.java

class Solution {
    public int findComplement(int num) {
       int x=0;int sum=0;
        while(num>0){
           int i = num%2;
            if(i==0){
               sum+=Math.pow(2,x++);
            }
            else{
                x++;
            }
            num/=2;
        }
        return sum;
    }
}