View Code of Problem 48

#include<stdio.h>
int main()
{
	int i,n;
	double x1,x2,temp,sum=0.0;
	scanf("%d",&n);
	x1=2.0;
	x2=1.0;
	for(i=0;i<n;i++)
	{
		sum=x1/x2+sum;
		temp=x1;
		x1=x1+x2;
		x2=temp;
	}
	printf("%.6lf\n",sum);
}