Number Factorizer. Enter a number to factorize. (long double)

factorize.cpp

// This source code written by Roland Ihasz
#include <iostream>
#include <vector>
#include <iomanip>      // std::setprecision

using namespace std;

int main()
{
    
    long double n;
    vector <long double> factorial;
    long double result = 1;
    cout << "Enter a number to factorize: ";
    cin >> n;
    if (n == 1 || n < 1)
    {
        cout << n << "! = " << 1 << endl;
    }
    if (n > 1)
    {
        for (long double i  = 0; i < n; i++)
        {
            result *=n-i;
            factorial.push_back(result);
        }
        cout << n << "! = " << setprecision(64) << factorial[n-2] <<  endl;
    }
    return 0;
}