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template<size_t Nb>
class std::bitset< Nb >

#include <bitset>
#include <iostream>
#include <sstream>

using namespace std;

int main()
{
  long         a = 'a';
  bitset<10>   b(a);

  cout << "b('a') is " << b << endl;

  ostringstream s;
  s << b;
  string  str = s.str();
  cout << "index 3 in the string is " << str[3] << " but\n"
       << "index 3 in the bitset is " << b[3] << endl;
}