Question

write a C++ program to display sum of factorial upto n series

Answer 1

#include<iostream>
using namespace std;
int factorial(int n); //factorial function declaration

int main()
{
int n,sum=0;
     cout << "Enter a positive integer: ";
    cin >> n;
     for(int i=1;i<=n;i++)
{
 sum = sum+factorial(i);
 }
cout<<"sum = "<<sum;
   return 0;
}
//factorial function definition
int factorial(int n)
{
    if(n > 1)
         return n * factorial(n - 1);
     else
        return 1;
}