View Code of Problem 48

#include <stdio.h>
#include <iostream>
#include <string.h>
#include <string>
#include <algorithm>
#include <iomanip>
#include<vector>
#include<math.h>
//#include<bits/stdc++.h>
using namespace std;
int main()
{
	double a = 2, b = 1;
	int n;
	cin >> n;
	double sum=0;
	double t;
	while (n--) {
		sum += a / b;
		t = a;
		a = a + b;
		b = t;
	}
	cout << fixed << setprecision(6) << sum;
}

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