View Code of Problem 71

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