#include <iostream>
#include <cstdlib>
#include <string>   // for class string
#include <chrono>   // for class system_clock
#include <ctime>    // for the function localtime
using namespace std;

int main()
{
    const char sun {1 << 0};   // 00000001
    const char mon {1 << 1};   // 00000010
    const char tue {1 << 2};   // 00000100
    const char wed {1 << 3};   // 00001000
    const char thu {1 << 4};   // 00010000
    const char fri {1 << 5};   // 00100000
    const char sat {1 << 6};   // 01000000

    struct restaurant {
        string name;
        char days;   // which days of the week the restaurant is open
    };

    const restaurant a[] {
        {"Katz's Delicatessen", sun | mon | tue},             // 00000111 0x07
        {"Tavern on the Green", sat | sun},                   // 01000001 0x41
        {"Wo Hop", sun | mon | tue | wed | thu | fri | sat},  // 01111111 0x7F
        {"Luchow's", mon | tue | wed},                        // 00001110 0x0E
        {"Delmonico's", thu | fri | sun},                     // 00110001 0x31
        {"Phantom Eats", 0x00}                                // 00000000 (never open)
    };

    const size_t n {size(a)};   // how many restaurants

    const auto now {chrono::system_clock::now()};
    const time_t t {chrono::system_clock::to_time_t(now)};
    const tm *const p {localtime(&t)};
    const int day {p->tm_wday}; // 0 = Sunday, 1 = Monday, ... 6 = Saturday

    const string dayname[] {
        "Sunday",    // 0
        "Monday",    // 1
        "Tuesday",   // 2
        "Wednesday", // 3
        "Thursday",  // 4
        "Friday",    // 5
        "Saturday"   // 6
    };

    cout << "Today is " << dayname[day] << ".\n";
    cout << "The following restaurants are closed today:\n";

    for (int i {0}; i < n; ++i) {
        // If the bit for 'day' is NOT set, the restaurant is closed today
        if (!(a[i].days >> day & 0x1)) {
            cout << a[i].name << "\n";
        }
    }

    return EXIT_SUCCESS;
}