message: Update Q4.cpp
  Please have a look.......its my first time trying out more such problems
diff: @@ -6,9 +6,14 @@ using namespace std;
  class Solution
  {
  public:
  - int setBits(int N)
  + int setBits(int n)
  {
  - // Write Your Code here
  + unsigned int count = 0;
  + while (n) {
  + count += n & 1;
  + n >>= 1;
  + }
  + return count;
  }
  };
  