/******************************************************************************
 * This program prints physical constants.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#undef NDEBUG

#include <clocale>
#include <cmath>
#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 AVOGADRO = 6.0221412927e23;
static double const ELECTRON_MASS = 9.1093821545e-31;

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

    wcout << L"General Format" << endl;
    wcout << fmt::format(L"π: {0:g} {0:.2g} |{0:10.2g}|", M_PI) << endl;
    wcout << fmt::format(L"ℯ: {0:g} {0:.2g} |{0:10.2g}|", M_E) << endl;
    wcout << fmt::format(L"N\u2090: {0:g} {0:.2g} |{0:10.2g}|", AVOGADRO) << endl;
    wcout << fmt::format(L"m\u2091: {0:g} {0:.2g} |{0:10.2g}|", ELECTRON_MASS) << endl;

    wcout << L"Fixed Format" << endl;
    wcout << fmt::format(L"π: {0:f} {0:.2f} |{0:10.2f}|", M_PI) << endl;
    wcout << fmt::format(L"ℯ: {0:f} {0:.2f} |{0:10.2f}|", M_E) << endl;
    wcout << fmt::format(L"N\u2090: {0:f} {0:.2f} |{0:10.2f}|", AVOGADRO) << endl;
    wcout << fmt::format(L"m\u2091: {0:f} {0:.2f} |{0:10.2f}|", ELECTRON_MASS) << endl;

    wcout << L"Scientific Format" << endl;
    wcout << fmt::format(L"π: {0:e} {0:.2e} |{0:10.2e}|", M_PI) << endl;
    wcout << fmt::format(L"ℯ: {0:e} {0:.2e} |{0:10.2e}|", M_E) << endl;
    wcout << fmt::format(L"N\u2090: {0:e} {0:.2e} |{0:10.2e}|", AVOGADRO) << endl;
    wcout << fmt::format(L"m\u2091: {0:e} {0:.2e} |{0:10.2e}|", ELECTRON_MASS) << endl;
    return 0;
}