1 #include <iostream>
2 #include <bitset>
3 using namespace std;
4
5 class BitCount
6 {
7 public:
8 size_t Count1(size_t n)
9 {
10 size_t counts = 0;
11
12 while (n > 0)
13 {
14 counts += (n & 1);
15 n >>= 1;
16 }
17
18 return counts;
19 }
20
21 size_t Count2(const size_t n)
22 {
23 constexpr size_t N = sizeof(n);
24 std::bitset<N> tmp(n);
25
26 return tmp.count();
27 }
28 };
29
30 int main()
31 {
32 BitCount bc;
33
34 cout << bc.Count1(6) << endl;
35 cout << bc.Count2(6) << endl;
36
37 return 0;
38 }
