#include <iostream.h>
#include <stl.h>

int main ()
{
  bit_vector b (3);
  for (int i = 0; i < b.size (); i++)
    cout << b[i];
  cout << endl;
  b[0] = b[2] = 1;
  for (i = 0; i < b.size (); i++)
    cout << b[i];
  cout << endl;
  return 0;
}