面向對象程序設計c++編程題，求解脫......跪求大神...小弟財富值沒了，實在不好意思！

class yearworker : public Company

{

virtual int salary() const = 0;

}

class monthwoker : public Company

{

}

class weekworker : public Company

{

}

每個子類去實現它(int salary() const )，