View Code of Problem 48

#include<stdio.h>
int main(){
	int n,i;
	
	scanf("%d",&n);
	int a=1,b=2,c;
	double sum=b/a;
	for(i=2;i<=n;i++){
		c=a+b;
		a=b;
		b=c;
		sum=sum + (double)b/a;
		
	
	
	}
	printf("%.6f",sum);
	
	
	
	return 0;
}