View Code of Problem 48

#include <stdio.h>
int main(){
	int n;
	scanf("%d",&n);
	int i,x,y;
	float sum=2;
	x=2;y=1;
	for(i=2;i<=n;i++){
		int tmp=y;
		y=x;
		x=tmp+x;
		sum=sum+(x*1.0)/y;	
	}
	printf("%.6f",sum);
	return 0;
}