View Code of Problem 48

#include "stdio.h"
#include "math.h"
#include "string.h"

void main()
{
	int i,j,k;
	double a[100];
	double sum=0;
	int n;
	scanf("%d",&n);
	a[0]=1;
	a[1]=2;
	for(i=2;i<12;i++)
		a[i]=a[i-1]+a[i-2];
	for(i=0;i<n;i++)
	{
		sum=sum+a[i+1]/a[i];
	}
	printf("%.6lf",sum);

}