/******************************************************************************
 * This program computes leap years.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#undef NDEBUG

#include <clocale>
#include <codecvt>
#include <iostream>
#include <string>

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

/******************************************************************************
 * Returns true if a year is a leap year.
 *****************************************************************************/
bool is_leap_year(int Y) noexcept {
    return Y % 4 == 0 && Y % 100 != 0 || Y % 400 == 0;
}

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

    wcout << L"1900 is " << (is_leap_year(1900) ? L"" : L"NOT ") << L"a leap year." << endl;
    wcout << L"2000 is " << (is_leap_year(2000) ? L"" : L"NOT ") << L"a leap year." << endl;
    wcout << L"2012 is " << (is_leap_year(2012) ? L"" : L"NOT ") << L"a leap year." << endl;
    wcout << L"2019 is " << (is_leap_year(2019) ? L"" : L"NOT ") << L"a leap year." << endl;
    return 0;
}