#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

const double N {15};
int main() {

    long intCalc {0};
    double approximation{0};

    intCalc = 15l * 14 * 13 * 12 * 11 * 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2;

    approximation = exp(-N) * pow(N,N) * sqrt(2 * N * M_PI);

    //cout << fixed;
    cout << setfill('*');
    cout << noshowpoint;
    cout << setprecision(0); 

    int spacing {5};

    cout << N  << setw(12) << "! = " << setw(spacing) << intCalc << endl;
    cout << N  << setw(12) << "! is about "  << setw(spacing)
         << approximation << defaultfloat << endl;
/*
    cout << endl << endl;
    cout << setw(1) << "hi" << endl;
    cout << setw(2) << "hi" << endl;
    cout << setw(3) << "hi" << endl;
    cout << setw(4) << "hi" << endl;
*/
    return 0;
}