View Code of Problem 48

#define _CRT_SECURE_NO_DEPRECATE
#include <iostream>
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<string>
using namespace std;
int main()
{
	int n,t;
	double a1 = 1.0, a2 = 2.0;
	double a[10];
	//printf("%lf %lf", a1, a2);
	for (int i = 0; i < 10; i++) {
		a[i] = a2 / a1;
		//printf("%lf %lf\n", a1, a2);
		t = a2;
		a2 = a2 + a1;
		a1 = t;
		
		//printf("%lf\n", a[i]);
	}
	double sum = 0;
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		sum =sum + a[i];

	}
	printf("%lf", sum);
}