View Code of Problem 48

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