View Code of Problem 48

#include<stdio.h>
main()
{
	int n,i;
	double sum,a,b,c,d,x,y;
	scanf("%d",&n);
	a=2;
	b=3;
	c=1;
	d=a;
	if(n==1)
	sum=2;
	else
	sum=a/c+b/d;
	for(i=3;i<=n;i++){
		x=a+b;
		y=c+d;
		sum=sum+x/y;
		a=b;
		b=x;
		c=d;
		d=y;
	}
	printf("%.6f",sum);
}