View Code of Problem 48

#include <stdio.h>

int main(){
	int n;
	double sum = 0.0;
	int a[11] ={0};
	a[0]=1;
	a[1]=2;
	for(int i = 2;i<11;i++){
		a[i]=a[i-2]+a[i-1];
	}
	scanf("%d",&n);
	for(int i = 0;i<n;i++){
		double num = (double)a[i+1]/a[i];
		sum += num;
	}
	printf("%f\n",sum);
}