How to calculate the value of e using series (C++)

Value of e

vofe() returns the value of e without using built-in function.

Code

#include "stdafx.h"

#include "iostream"

#include "conio.h"

#include "iomanip"

using namespace std;

double factorial(long number)

{

double factorial=1;

 for(int i=number;i>0;i--)

  factorial=factorial*i;

return factorial;

}

double vofe()

{

       double sum=1;

   

              for(int i=1;i<9;i++)

            sum=sum+(1/factorial(i));

return sum;

}

int main()

{

       cout << vofe() << endl ;

       _getche();

       return 0;

}

Output

2.71828