#include <expected>
#include <print>
#include <string>

std::expected<int, std::string> question(int n)
{
  if (n == 42) return n;
  else return std::unexpected{ n < 42 ? "zu klein" : "zu groß" };
}

int main()
{
  for (int n : { 6, 7, 8, 9 })
  {
    auto answer = question(6*n);
    if (answer.has_value())        // oder: if(answer)
      std::println("Die richtige Antwort ist {}", answer.value());
    else
      std::println("Fehler: {}", answer.error());
  }
}