View Code of Problem 48

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