View Code of Problem 48

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