enum in c++

#include <iostream>

enum Days {
    Monday,    // 0
    Tuesday,   // 1
    Wednesday, // 2
    Thursday,  // 3
    Friday,    // 4
    Saturday,  // 5
    Sunday     // 6
};

int main() {
    Days today = Wednesday;

    switch (today) {
        case Monday:
            std::cout << "It's Monday." << std::endl;
            break;
        case Tuesday:
            std::cout << "It's Tuesday." << std::endl;
            break;
        case Wednesday:
            std::cout << "It's Wednesday." << std::endl;
            break;
        case Thursday:
            std::cout << "It's Thursday." << std::endl;
            break;
        case Friday:
            std::cout << "It's Friday." << std::endl;
            break;
        case Saturday:
            std::cout << "It's Saturday." << std::endl;
            break;
        case Sunday:
            std::cout << "It's Sunday." << std::endl;
            break;
    }

    return 0;
}