View Code of Problem 48

#include<stdio.h>
#include<string.h>
int main()
{
     int n,i;
     double s=2,f1=1,f2=2;
     scanf("%d",&n);
     for(i=2;i<=n;i++)
     {
         f2=f1+f2;
         f1=f2-f1;
         s=s+f2/f1;


     }
     printf("%.6lf\n",s);
      return 0;

}