View Code of Problem 71

#include<stdio.h>
#include<math.h>
#include <string.h>
#define Max 1000
int main ()
{
	double sum=0.0;
	double a=2,b=1,t;
	int n,i;
	scanf("%d",&n);
	for(i=1;i<=n;i++)
	{
		sum+=a/b;
		t=a;a=a+b;b=t;
	}
	printf("%.2lf",sum);
	
	return 0;

}