virtual void read()=0;virtual void add()=0; virtual void modify(int)=0;virtual void del(int)=0;virtual void save()=0;virtual void sear()=0;
char carID[20];char carName[20];int carNum;
char busID[20];char busName[20];int busNum;
char Time[20];int ForRoad; unsigned Distance; float ForFuel;
Bus类
void read();void add();void modify(int);void del(int); void save();void sear();
char truckID[20];char truckName[20];int truckNum;
void read();void add();void modify(int);void del(int);void save();void sear();
Base类
Struck类
Car类
