View Code of Problem 48

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