View Code of Problem 48

#include<iostream>
#include<string.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	double a[100],b[100];
	a[0]=2;a[1]=3;
	b[0]=1;b[1]=2;
	double sum=0;
	for(int i=2;i<n;i++){
		a[i]=a[i-1]+a[i-2];
		b[i]=b[i-1]+b[i-2];
	}
	for(int i=0;i<n;i++){
		sum=sum+a[i]/b[i];
	}
	printf("%.6lf",sum);
	
}