Enum Basics

An enum gives names to a small set of related choices.

enum_basics.cpp

#include <iostream>
#include <string>

enum TrafficLight {
    Red,
    Yellow,
    Green
};

std::string describe(TrafficLight light) {
    if (light == Red) {
        return "stop";
    }
    if (light == Yellow) {
        return "slow";
    }
    return "go";
}

int main() {
    TrafficLight light = ;

    std::string action = describe(light);

    std::cout << "light=" << light << std::endl;
    std::cout << "action=" << action << std::endl;
    return 0;
}

#include <iostream>
#include <string>

enum TrafficLight {
    Red,
    Yellow,
    Green
};

std::string describe(TrafficLight light) {
    if (light == Red) {
        return "stop";
    }
    if (light == Yellow) {
        return "slow";
    }
    return "go";
}

int main() {
    TrafficLight light = ;

    std::string action = describe(light);

    std::cout << "light=" << light << std::endl;
    std::cout << "action=" << action << std::endl;
    return 0;
}

#include <iostream>
#include <string>

enum TrafficLight {
    Red,
    Yellow,
    Green
};

std::string describe(TrafficLight light) {
    if (light == Red) {
        return "stop";
    }
    if (light == Yellow) {
        return "slow";
    }
    return "go";
}

int main() {
    TrafficLight light = ;

    std::string action = describe(light);

    std::cout << "light=" << light << std::endl;
    std::cout << "action=" << action << std::endl;
    return 0;
}

unscoped enum An unscoped enum creates named constants that can be used instead of plain numbers.