#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;

int main()
{
    /*
    cout << setfill('.');
    string s = "hello";
    cout << '*' << s << '*' << endl;
    cout << '*' << setw(9) << s << '*' << endl;
    cout << '*' << left << setw(9) << s << '*' << s << '*' << endl;
    s = "hello there y'all";
    cout << '*' << setw(9) << s << '*' << endl;
    */
/*
    vector<int> x(10);
    vector<double> vd;
    for (int i = 0; i < 10; i++)
        cout << x[i] << endl;
    cout << x.size() << endl;
    x.push_back(23);
    cout << x.size() << endl;
    cout << vd.size() << endl;

  */

  double pi = 3.141592654;

  cout << setprecision(3) << pi << endl;
  cout << fixed << setprecision(3) << pi << endl;
}