View Code of Problem 71

#include<stdio.h>
int main(){
	float up=2.0,down=1.0;
	int n,i;
   	int temp;
	float sum=0.0;
	scanf("%d",&n);
	for(i=1;i<=n;i++){
		sum = sum + up/down;
		temp = up + down;
		down = up;
		up = temp;
	}
	printf("%.2f",sum);
	return 0;
}