GPIO State Enum

#include <iostream>
#include <cstdint>

// Declare enum class PinState with underlying type uint8_t
// Values: Low, High
enum class PinState : uint8_t { Low, High};

// Implement: const char* toString(PinState s)
const char* toString(PinState s)
{
    return ( s == PinState::Low ) ? "LOW" : "HIGH";
}
int main() {
    int x;
    std::cin >> x;

    // x is guaranteed to be 0 or 1
    PinState s = (x == 0) ? PinState::Low : PinState::High;
    std::cout << toString(s);
    return 0;
}

Solving Approach