/******************************************************************************
 * This program demonstrates floating point error.
 * 
 * Copyright © 2021 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;

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

    double oneThird = 1. / 3.;
    wcout << fmt::format(L"1/3: {0:.16f}", oneThird) << endl;
    wcout << fmt::format(L"one: {0:.16f}", oneThird * 3.0) << endl;
    wcout << fmt::format(L"three: {0:.16f}", oneThird * 9.0) << endl;
    wcout << fmt::format(L"hundred: {0:.16f}", oneThird * 300.0) << endl;

    double twoTenths = 0.2;
    double sum = 0.0;
    for (int x = 0; x < 1000; ++x) {
        sum += twoTenths;
    }
    wcout << fmt::format(L"twoTenths: {0:.16f}", twoTenths) << endl;
    wcout << fmt::format(L"sum: {0:.16f}", sum) << endl;
    wcout << fmt::format(L"200: {0:.16f}", twoTenths * 1000.) << endl;
    return 0;
}