#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

const int sun {1 << 0};   //00000000000000000000000000000001
const int mon {1 << 1};   //00000000000000000000000000000010
const int tue {1 << 2};   //00000000000000000000000000000100
const int wed {1 << 3};   //00000000000000000000000000001000
const int thu {1 << 4};   //00000000000000000000000000010000
const int fri {1 << 5};   //00000000000000000000000000100000
const int sat {1 << 6};   //00000000000000000000000001000000

struct dining_option {       
	string name;
	int days;       //what day(s) of the week this restaurant is open
};

void f(const dining_option *p, int  current_day);

int main()
{
	//00000000000000000000000001011110   The vertical bar is "bitwise or".
	const dining_option Argo {"Argo Tea", mon | tue | wed | thu | sat};
					      
	//00000000000000000000000001111111
	const dining_option Community {"Community Dining Hall",
		mon | tue | wed | thu | fri | sat | sun}; 

	//00000000000000000000000001011110
	const dining_option RamCaf {"Ram Caf", mon | tue | wed | thu | sat};
	
	//Ask the operating system for the current day of the week.
	const time_t t {time(nullptr)};
	const tm *const localTime {localtime(&t)};
        const int current_day {localTime->tm_wday};   //day of week (0-6)

	//Pass  the addresses of the structures to the function
	f(&Argo, current_day);
	f(&Community, current_day);
	f(&RamCaf, current_day);

	return EXIT_SUCCESS;
}

//Check if the bit for current_day is turned on in p->days.

void f(const dining_option *p, int current_day)
{
	cout << p->name << " is ";
	if (p->days >> current_day & 1) {
		cout << "open";
	} else {
		cout << "closed";
	}
	cout << " today.\n";
}