View Code of Problem 48

#include<stdio.h>
#include<math.h>
int main(){
	int n,i;
	double sum=0,a=2,b=1;
	scanf("%d",&n);
		for(i=1;i<=n;i++){
		sum=sum+a/b;
		a=a+b;
		b=a-b;
	}
	printf("%.6f",sum);
	return 0;
}