View Code of Problem 48

#include<stdio.h>
#include<math.h>
#include<string.h>

int main()
{	
	int t=0.0;
 	double  a=1.0;
 	double  b=2.0;
 	int n;
 	scanf("%d",&n);
	//int i=1;
	double sum=0.0;
	for(int i=1;i<=n;i++){
		sum+=(b/a);
		t=b;
		b=a+b;
		a=t;
	}
 	printf("%.6f",sum);
 	
 
	return 0;
	
}