c++ inheritance and polymorphism帮我补充以下sale class 的那6个functions 和 discontsale 的4个funciton#include#include using namespace std;// class Saleclass Sale {private:double price;public:Sale();Sale( double p );Sale( const Sale & r);vi

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c++ inheritance and polymorphism帮我补充以下sale class 的那6个functions 和 discontsale 的4个funciton#include#include using namespace std;// class Saleclass Sale {private:double price;public:Sale();Sale( double p );Sale( const Sale & r);vi

c++ inheritance and polymorphism帮我补充以下sale class 的那6个functions 和 discontsale 的4个funciton#include#include using namespace std;// class Saleclass Sale {private:double price;public:Sale();Sale( double p );Sale( const Sale & r);vi
c++ inheritance and polymorphism
帮我补充以下sale class 的那6个functions 和 discontsale 的4个funciton
#include
#include
using namespace std;
// class Sale
class Sale {
private:
double price;
public:
Sale();
Sale( double p );
Sale( const Sale & r);
virtual double bill()const;
double savings( const Sale& r ) const;
bool operator

c++ inheritance and polymorphism帮我补充以下sale class 的那6个functions 和 discontsale 的4个funciton#include#include using namespace std;// class Saleclass Sale {private:double price;public:Sale();Sale( double p );Sale( const Sale & r);vi
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