#include <exception>
#include <iostream>
#include <string>
using   std::exception, std::runtime_error, std::invalid_argument, std::out_of_range,
        std::cin, std::cout, std::cerr, std::endl,
        std::string, std::getline, std::stoi;

auto fail( const string& s ) -> bool { throw runtime_error( s ); }

#define FAIL( s ) fail( string() + __func__ + " - " + s )

auto input()
    -> string
{
    string line;
    getline( cin, line ) or FAIL( "std::getline failed" );
    return line;
}

auto input_int( const string& prompt )
    -> int
{
    for( ;; ) {
        cout << prompt;
        try {
            return stoi( input() );
        } catch( const invalid_argument& ) {
            cout << "^ Not a valid integer." << endl;
        } catch( const out_of_range& ) {
            cout << "^ That value is too large." << endl;
        }
    }
}

void cpp_main()
{

    const int n = input_int( "Enter a number: " );
    const string kind = (n % 2 == 0? "EVEN" : "ODD");
    cout << endl;
    cout << "\bThe number you entered is an " << kind << " NUMBER." << endl;
    cout << "Thank you." << endl;
}

#include <stdlib.h>     // EXIT_...

auto main()
    -> int
{
    try {
        cpp_main();
        return EXIT_SUCCESS;
    } catch( const exception& x ) {
        cerr << "!" << x.what() << endl;
    }
    return EXIT_FAILURE;
}