64. GPIO State Enum

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

enum class PinState : uint8_t { Low, High };

const char* toString(PinState s) {
    switch (s) {
        case PinState::Low:  return "LOW";
        case PinState::High: return "HIGH";
    }
    return "LOW"; // unreachable fallback
}

int main() {
    int x;
    cin >> x;

    PinState s = (x == 0) ? PinState::Low : PinState::High;
    cout << toString(s);
    return 0;
}

Solution Details

• enum class is strongly typed and scoped, so you must use PinState::Low/High.
• The explicit underlying type : uint8_t matches typical register bit sizes.
• toString centralizes text conversion for logging or debugging.
  
   

Significance for Embedded Developers

• Replaces “magic numbers” with clear, type-safe states.
• Keeps API surfaces clean and prevents accidental mixing with integers.
• Using uint8_t mirrors hardware register widths and saves RAM/ROM.