C++ 类设计：汽车、客车、货车、客货两用车

class CAR { protected: int speed; public: CAR(int s) { speed = s; } ~CAR() { } void Show() { cout'Speed: ' << speed << endl; } };

class BUS : public CAR { protected: int seat; public: BUS(int s, int t) : CAR(s) { seat = t; } ~BUS() { } void Show() { cout'Speed: ' << speed << endl; cout'Seat: ' << seat << endl; } };

class TRUCK : public CAR { protected: int load; public: TRUCK(int s, int t) : CAR(s) { load = t; } ~TRUCK() { } void Show() { cout'Speed: ' << speed << endl; cout'Load: ' << load << endl; } };

class VAN : public BUS, public TRUCK { public: VAN(int s, int t, int u) : BUS(s, t), TRUCK(s, u), CAR(s) { } ~VAN() { } void Show() { cout'Speed: ' << speed << endl; cout'Seat: ' << seat << endl; cout'Load: ' << load << endl; } };