View Code of Problem 48

#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<math.h>
using namespace std;
int main()
{
	int n;
	int num[15];
	double d = 0;
	num[0] = 1;
	num[1] = 2;
	for(int i = 2; i < 15; i++)
		num[i] = num[i-1] + num[i-2];
	scanf("%d", &n);
	for(int i = 1; i <= n; i++)
		d += (double)num[i] / num[i-1];
	printf("%.6lf", d);
	return 0;
 }