Enum help

[domweng]

So I'm just doing a simple code to show use of enumerations in a code of our choice. I kind of understand how they work and I'm just doing a simple code where you enter the week day and it'll tell you what tomorrow is. My issue is I don't know how to output the corresponding week day with the number entered. I may be confused but the index position should go {sunday (0), monday (1)...} I don't know if I'm thinking of arrays but could somebody be so kind to help me as if the tommorow variable equals 0 it'll output "sunday" so on and so forth...

  #include <iostream>
#include <string>
#include <climits>

using namespace std;

enum weekDays {sunday, monday, tuesday, wednesday, thursday, friday, saturday};

int getDay()
{
    int day;
    cout << "Enter today: ";
    cin >> day;
    cout << endl;
    
    while(!cin || day < 0 || day > 7)
    {
        if(!cin)
        {
            cout << "You must enter a number" << endl;
            cin.clear();
            cin.ignore(INT_MAX, '\n');
        }
        else if(day < 0)
        {
            cout << "You must enter a number 0 - 7" << endl;
        }
        else
        {
            cout << "You must enter a number 0 - 7" << endl; 
        }
        cout << "Enter the day: ";
        cin >> day;
        cout << endl;
        
    }
    return day;
}

int nextDay(int day)
{
    int tommorow = day + 1;
    if(tommorow == 8)
    {
        tommorow = 0;
    }
    return tommorow;
}

int main()
{
    int day = getDay();
    cout << "Today is " << day << endl;
    int tommorow = nextDay(day);
    cout << "Tommorow will be " << tommorow << endl;
    
    
    return 0;
}

[Ganado]

Is this specifically an exercise to learn how to use enums, or is a solution without enums acceptable?

"You must enter a number 0 - 7"

I think you have some off-by-one errors. Are there 7 days or 8 days in a week? :)

The problem is that there is inherently no logical mapping between the integers of an enum and strings like "Tuesday"or "Wednesday". Enums are used to help avoid magic numbers like

if (option == 42) // wtf does 42 mean?
{
    // ...
}

You could use some clever macro magic to map the numbers to string literals, but I personally avoid it if possible.

To convert an int to a string for the day of the week, consider an array, like:

// expected input: [1, 7], inclusive
std::string day_of_the_week(int day)
{
    if (day <= 0 || day > 7)
        return ""; // invalid, return empty string

    static const string days[] = { "Sunday", "Monday", "Tuesday", 
        "Wednesday", "Thursday", "Friday", "Saturday" };

    return days[day - 1];
}

[seeplus]

#include <iostream>
#include <string>
#include <limits>

enum weekDays { sunday, monday, tuesday, wednesday, thursday, friday, saturday };

std::string dayName(weekDays day)
{
	static const std::string names[7] {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

	return names[day];
}

weekDays getDay()
{
	int day {};

	while ((std::cout << "Enter today (0 - 6): ")  && (!(std::cin >> day) || day < 0 || day > 6))
		if (!std::cin) {
			std::cout << "You must enter a number\n";
			std::cin.clear();
			std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
		} else
			std::cout << "You must enter a number 0 - 6\n";

	return static_cast<weekDays>(day);
}

weekDays nextDay(weekDays day)
{
	weekDays tommorow {static_cast<weekDays>(day + 1)};

	if (tommorow == saturday + 1)
		tommorow = sunday;

	return tommorow;
}

int main()
{
	const auto day {getDay()};

	std::cout << "Today is " << dayName(day) << '\n';

	const auto tommorow {nextDay(day)};

	std::cout << "Tomorrow will be " << dayName(tommorow) << '\n';
}

Enter today (0 - 6): 6
Today is Saturday
Tomorrow will be Sunday