View Code of Problem 48

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