c++私有继承

//19.18 利用类的包含来实现代码重用 #include <iostream> #include <limits> // 为了使用numeric_limits using namespace std; class Data { public: Data(int number,float Price):num(number),price(Price){} virtual ~Data(){}; int GetNumber()const{return num;} float GetPrice()const{return price;} virtual void Print()const =0; private: int num; float price; }; class Book:public Data {