View Code of Problem 48

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
using namespace std;

int main()
{
    int num[20];
    double sum = 0;
    int n;
    num[0]=1,num[1]=2;
    for(int i =2;i<20;i++)
        num[i] = num[i-1]+num[i-2];
    scanf("%d",&n);
    for(int i = 0;i<n;i++)
    {
        sum = sum + double(num[i+1]) / double(num[i]);
    }
    printf("%.6lf",sum);
    return 0;
}