View Code of Problem 48

#include<stdio.h>
#include<math.h>
#include <string.h>
#define Max 91
int main()
{
	int n,i,t;
	scanf("%d",&n);
	double a=2,b=1,sum=0;
	for(i=1;i<=n;i++)
	{
		sum=sum+a/b;
		t=a;
		a=a+b;
		b=t;
	}
	printf("%.6lf\n",sum);

 return 0;
}