View Code of Problem 71

#include<stdio.h>
int main()
{
	int i,n;

	double sum=0,t,a=1.0,b=2.0;
	scanf("%d",&n);
	for (i=0;i<n;i++)
	{	
		sum=sum+b/a;
		t=b;
		b=b+a;
		a=t;	
	}
	printf("%.2f\n",sum);
	return 0;
}