View Code of Problem 48

#include<stdio.h>
int main()
{
	int i,n,t;
	double a=1.0,b=2.0;
	double sum=0.0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		sum+=b/a;
		t=b;
		b=a+b;
		a=t;
	}
	printf("%.6lf",sum);
	return 0;
}