View Code of Problem 48

#include<stdio.h>
int main() {
	int i,n;
	double sum=0.0,a=2,b=1,c,p;	
	scanf("%d",&n);
	
	for(i=0;i<n;i++){
		sum+=(a/b);
		c=a;
		a=a+b;
		b=c;
	}
	printf("%.6lf\n",sum);
  return 0;
}