C++ program to find the sum of the series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n!

In this tutorial, we will be discussing a program to find the sum of the given series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n!.

For this, we will be given with the value of n and our task is to add up every term starting from the first one to find the sum of the given series.

Example

#include <iostream>
using namespace std;
//calculating the sum of the series
double calc_sum(int n) {
   int i;
   double sum = 0, fact=1;
   for (i = 1; i <= n; i++)
   fact = fact * i;
   sum += i/fact;
   return sum;
}
int main() {
   int n = 6;
   double res = calc_sum(n);
   cout << res << endl;
   return 0;
}

Output

0.00972222