Sn = 1 + 2 + *** + n; value calculating 1 / S1 + 1 / S2 + *** + 1 / Sn is

#include<iostream>
using namespace std;
float sn(int n)
{
 float sum=0;
 float s,res=0;
 for(int i=1;i<=n;i++)
 {
  sum=sum+1;
  s=1/sum;
  res=res+s;
 }
 printf("%.6f",res);
}
int main()
{
 int n=0;
 cin>>n;
 sn(n);
}