#include <iostream>
#include <fstream>
#include <string>
#include <iomanip> // needed for setw()

using namespace std;

int main() 
{

  double a;

  a = 123.456;

  cout.setf(ios::scientific);
  cout << a << endl;
  cout.unsetf(ios::scientific);

  cout << a << endl;

  cout.setf(ios::scientific);
  long flags = cout.flags();
  cout << a << endl;
  cout.flags(flags);

  cout << a << endl;


  
  return 0;
}