View Code of Problem 48

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