Mode Selection Enum

#include <iostream>
#include <cstdint>
using namespace std;

// your code here: declare enum class Mode with values Input, Output, PullUp, PullDown
enum Mode {
    Input,
    Output,
    PullUp,
    PullDown
};

// your code here: implement const char* toString(Mode m)
const char* toString (Mode m) {
    char *ret = nullptr;
    switch(m) {
        case Mode::Input:
            ret = "INPUT";
            break;

        case Mode::Output:
            ret = "OUTPUT";
            break;

        case Mode::PullUp:
            ret = "PULLUP";
            break;

        case Mode::PullDown:
            ret = "PULLDOWN";
            break;

        default:
            ret = "ERROR";
    }
    return ret;
}

int main() {
    int x;
    cin >> x;

    Mode m = Mode::Input; // default
    if (x == 0)      m = Mode::Input;
    else if (x == 1) m = Mode::Output;
    else if (x == 2) m = Mode::PullUp;
    else if (x == 3) m = Mode::PullDown;

    cout << toString(m);

    return 0;
}