View Code of Problem 48

#include <stdio.h>

int main (){
	int n;
	scanf("%d",&n);
	double a=1.0;
	double b=2.0;
	double result=0;
	while(n--){
		result=result+b/a;
		int mid =a+b;
		a=b;
		b=mid;
	}
	printf("%.6f",result);
}