#include<iostream>

using namespace std;

double ToCelsius(double farhrenheit);
double ToKelvin(double fahrenheit);

int main()
{
    // Prompt the user and get their input.
    cout << "Enter a temperature in Fahrenheit and it will be converted into Celsius and Kelvin." << endl;

    // TODO: Change this to an int to follow the specification to the T.
    // It doesn't really make sense to only allow whole numbers to be entered,
    // but whatever.
    double fahrenheit = 0.0;
    cin >> fahrenheit;

    // Call into our functions to perform the calculations.
    double celsius = ToCelsius(fahrenheit);
    double kelvin = ToKelvin(fahrenheit);

    // Print the results.
    cout << fahrenheit << " is " << celsius << " in Celsius." << endl;
    cout << fahrenheit << " is " << kelvin << " in Kelvin." << endl;
    system("pause");

    return 0;
}

double ToCelsius(double fahrenheit)
{
    // Hi, my name is *ms narrator voice starts* Paul Pham *ms narrator voice ends* and this is a micro-optimization.
    // Division takes longer to perform than multiplication, so we'll only do the division one time
    // then just use that calculated value.

    const double FIVE_OVER_NINE = 5.0 / 9.0;
    return (fahrenheit - 32) * FIVE_OVER_NINE;

    // Use this one to remove the constant double...
    // return (fahrenheit - 32) * (5.0 / 9.0);
}

double ToKelvin(double fahrenheit)
{
    // It'll save us some typing - and reduce code duplication - to convert to celsius first.
    // We could just accept the celsius as an input parameter, but that would be inconsistent
    // with our ToCelsius function.
    return ToCelsius(fahrenheit) + 273.15;
}