View Code of Problem 48

#include<stdio.h>
int main()
{
	int t;
	scanf("%d",&t);

	int i=0;
	double sum=0;
	double a,b;
	a=2;
	b=1;
	double m;

	for(i=0;i<t;i++)
	{
		sum+=a/b;
		m=a;
		a=a+b;
		b=m;
	}

	printf("%.6lf\n",sum);

	return 0;
}