Temperature Conversion (without Kelvin)

// Brett Westbrook
// COSC 1330 - 003
// Chapter 9 - Temperature Conversion
// Converts from Fahrenheit to Celsius and vice versa. (Might implement Kelvin)

/*

Formulas

[°C] = ([°F] - 32) × 5/9 | FAHRENHEIT TO CELSIUS
[°F] = [°C] × 9/5 + 32   | CELSIUS TO FAHRENHEIT

*/

#include <iostream>
#include <iomanip>

using namespace std;

char getTempType(char convertSelect);
double convertToCelsius(double inFahrenheit, double outCelsius);
double convertToFahrenheit(double inCelsius, double outFahrenheit);

int main()
{
    // Variable Declarations

    // Celsius
    double inputCelsius = 0.0;
    double outputCelsius = 0.0;

    // Fahrenheit
    double inputFahrenheit = 0.0;
    double outputFahrenheit = 0.0;

    char selection = ' ';

    selection = getTempType(selection);

    system("PAUSE");
    return 0;
}

// Functions

char getTempType(char convertSelect) // Processes the arithmetic and conversions
{
    char selection = ' ';
    char loop = ' ';

    // Celsius
    double inputCelsius = 0.0;
    double outputCelsius = 0.0;

    // Fahrenheit
    double inputFahrenheit = 0.0;
    double outputFahrenheit = 0.0;

    do { // begin loop
        cout << "Press 1 to convert from Celsius to Fahrenheit" << endl;
        cout << "Press 2 to convert from Fahrenheit to Celsius" << endl;
        cin >> selection;

        system("CLS");

        // selecting a method of conversion
        switch (selection) {
        case '1':
            outputFahrenheit = convertToFahrenheit(inputCelsius, outputFahrenheit);
            break;
        case '2':
            outputCelsius = convertToCelsius(inputFahrenheit, outputCelsius);
            break;
        default:
            cout << "Invalid input." << endl;
        }

        cout << endl << "Would you like to make another conversion? (Y for yes / N for no)" << endl;
        cin >> loop;

        system("CLS");

        if (loop == 'n' || loop == 'N') {
            cout << "Thanks for using this conversion tool!" << endl;
        }
    } while (loop == 'y' || loop == 'Y'); // end loop

    return selection;
}

double convertToFahrenheit(double inCelsius, double outFahrenheit) // CELSIUS TO FAHRENHEIT
{
    // [°F] = [°C] × 9/5 + 32   | CELSIUS TO FAHRENHEIT

    double inputCelsius = 0.0;
    double outputFahrenheit = 0.0;

    cout << "[Celsius] Enter temperature: ";
    cin >> inputCelsius;

    outputFahrenheit = (((inputCelsius * 9) / 5) + 32);

    cout << "Fahrenheit conversion: " << outputFahrenheit << endl;

    return outputFahrenheit;
}

double convertToCelsius(double inFahrenheit, double outCelsius) // FAHRENHEIT TO CELSIUS
{
    // [°C] = ([°F] - 32) × 5 / 9 | FAHRENHEIT TO CELSIUS

    double inputFahrenheit = 0.0;
    double outputCelsius = 0.0;

    cout << "[Fahrenheit] Enter temperature: ";
    cin >> inputFahrenheit;

    outputCelsius = (((inputFahrenheit - 32) / 9) * 5);

    cout << "Celsius conversion: " << fixed << setprecision(1) << outputCelsius << endl;

    return outputCelsius;
}