View Code of Problem 48

#include<iostream>
#include<iomanip>

using namespace std;

int main()
{
    int n;
    cin>>n;
    int fm[n],fz[n];
    double result[n],sum;
    fm[0]=1;fz[0]=2;sum=2.0;
    for(int i=1;i<n;i++)
    {
        fz[i]=fm[i-1]+fz[i-1];
        fm[i]=fz[i-1];
        result[i]=fz[i]*1.0/fm[i];
        sum+=result[i];
    }
    cout<<fixed<<setprecision(6)<<sum;
    return 0;
}