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#include<iostream>

#include<iomanip>

#include<limits>

#include<cmath>

using namespace std;

int main()

{

double pi = 4 * atan(1.0);

cout << pi << endl;

cout << fixed << pi << endl;

cout << scientific << pi << endl;

pi /= 1000000.0;

cout << setprecision (numeric_limits<double>::digits10 + 1) << fixed << pi << endl;

cout << setprecision (numeric_limits<double>::digits10 + 1) << scientific << pi << endl;

}

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