namespace 활용 #include using namespace std; namespace CAR_CONST { enum { ID_LEN = 20, MAX_SPD = 200, FUEL_STEP = 2, ACC_STEP = 10, BRK_STEP = 10 }; } struct Car { char gamerID[CAR_CONST::ID_LEN]; int fuelGauge; int curSpeed; void ShowCarState() { cout