C++ sum series factorial

Question

We are suppose to get a sum series but I am running into a problem.

1/n + 2/n-1 + 3/n-2 ...n/1 is the sum she wants

My for loop is not right and I can't figure out why The answer is suppose to be 8.70 but I get 27.

#include <iostream>
using namespace std;
int main()
{  

int n=5;
float sum=0;

    for(int i=1; i<=n; i++){
        for(int j =n; j>0; j--){
            sum += i/j;

        }
    }
   cout<<"Sum : "<<sum;}

Answer 1

1. You are using two loops to compute the sum while the series sum can be computed by a single loop. That should be a red flag.

2. Also, you are using integer division. That's going to give you wrong results.

Use:

#include <iostream>
using namespace std;
int main()
{  
   int n=5;
   float sum=0;

   for(int i=1; i <= n; i++)
   {
      sum += i*1.0f/(n - i + 1);
   }

   cout<<"Sum : "<<sum;
}