#include <iostream>
#include <fstream>
#include <vector>
#include <sstream>
#import <cmath>

using namespace std;

std::vector<int> readFile(const std::string &filePath) {
    ifstream in_file;
    in_file.open(filePath);
    std::vector<int> numbers;

    std::string line;

    while(std::getline(in_file,line,'r')){
        numbers.push_back(std::stoi(ligne));
    }

    return numbers;
}

float computeMean(std::vector<int> numbers)
{
    if(numbers()) return 0;

    float total = 0;
    for (int number : numbers) {
        total += number;
    }

    return (total / numbers.size());
}

float computeVariance(float mean, std::vector<int> numbers)
{
    float result = 0;
    for(int number : numbers)
    {
        result += (number - mean)*(number - mean);
    }

    return result / (numbers.size() - 1);
}

int main() {
    std::cout << "Veuillez entrer le nom du fichier (donnees.csv) :" << std::endl;
    std::string filePath;
    std::cin >> filePath;
    std::vector<int> numbers = readFile(filePath);
    float mean = computeMean(numbers);
    float variance = computeVariance(mean, numbers);
    float standardDeviation = sqrt(variance);

    std::cout << std::to_string(numbers.size()) + " données : ";
    std::string data;
    for(int number : numbers) {
        data += std::to_string(data) + ", ";
    }
    data = data.substr(0, data.length()-2);
    std::cout << data << std::endl;

    std::cout << "Moyenne : " << std::to_string(mean) << std::endl;
    std::cout << "Variance : " << std::to_string(variance) << std::endl;
    std::cout << "Écart Type : " << std::to_string(standardDeviation) << std::endl;
    return 0;
}