/******************************************************************************
 * This program computes a table of temperatures in four different scales.
 * 
 * See: https://en.wikipedia.org/wiki/Conversion_of_units_of_temperature
 * 
 * Copyright © 2016 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#include <clocale>
#include <codecvt>
#include <fmt/format.h>
#include <fmt/xchar.h>
#include <iostream>
#include <string>

std::locale utf8loc(std::locale(), new std::codecvt_utf8<wchar_t>);
using namespace std;

static double const CELCIUS_TO_KELVIN = 273.15;
static double const FAHRENHEIT_TO_RANKINE = 459.67;

int main(int argc, char **argv) {
    setlocale(LC_ALL, "en_US.UTF-8");
    wcout.imbue(utf8loc);
    wcin.imbue(utf8loc);

    wcout << fmt::format(L"{0:>7s} {1:>7s} {2:>7s} {3:>7s}", L"C", L"F", L"K", L"R") << endl;
    for (int i = -270; i <= 120; i += 5) {
        double degreesC = i;
        double degreesF = 1.8 * degreesC + 32.;
        double degreesK = degreesC + CELCIUS_TO_KELVIN;
        double degreesR = degreesF + FAHRENHEIT_TO_RANKINE;
        wcout << fmt::format(L"{0:7.2f} {1:7.2f} {2:7.2f} {3:7.2f}", degreesC, degreesF, degreesK, degreesR) << endl;
    }
    return 0;
}