#include <fstream>
    #include <vector>
    #include <iostream>

    //Forward declarations of functions.

    std::vector<double> readFile                (); //Reads the file into a vector, and then returns it

    void                outputToTable           (const std::vector<double> temperatures); //Produces a new text file in the form of a table

    double              celciusToFahrenheit     (const double celcius); //Converts Celsius to Fahrenheit

    double              celciusToKelvin         (const double celcius); //Converts Celsius to Kelvin

    int main()
    {
        std::vector<double> temperatures = readFile(); //Fill the list
        outputToTable(temperatures);    //Output to table
    }

    std::vector<double> readFile() //Function to read file, and return a list
    {
        std::ifstream file;
        file.open("Celsius.txt"); //Your text file name here

        std::vector<double> temperatures; //List of temperatures

        if (file.is_open()) {
            double val;
            while (file >> val) {
                temperatures.emplace_back(val);
            }
        }
        else {
            std::cout << "File could not be opened" << std::endl;
        }
        return std::move(temperatures);  //More efficient to use std::move (not sure if I am doing it right though,
                                        //You are better off returning without the std::move) aka "return temperatures
    }

    void outputToTable(const std::vector<double> temperatures)
    {
        std::ofstream file;
        file.open("Temperature Table");

        file << "Celsius \t Fahrenheit  \t Kelvin \n";

        for (auto& tempreture : temperatures) //This is called a "for each loop". I suggest you look this one up!
        {
            file    << tempreture                       << "\t \t \t " // a \t means "print a tab" aka a few spaces.
                    << celciusToFahrenheit(tempreture)  << "\t \t \t"
                    << celciusToKelvin(tempreture)     << "\n";
        }


    }

    double celciusToFahrenheit(const double celcius)
    {
        return celcius * 1.8 + 32; //I just googled the formula to convert this
    }

    double celciusToKelvin(const double celcius)
    {
        return celcius + 273.15; //I just googled the formula to convert this
    }