c++第十三章第四题

#ifndef PORT_H_
#define PORT_H_
#include <iostream>
using namespace std;
class Port
{
    
    
 private:
    char* brand;
    char style[20];
    int bottles；
 public:
    Port(const char* br = "none", const char* st = "none", int b = 0);
    Port(const Port& p);
    virtual ~Port() {
    
     delete[] brand; }
    Port& operator=(const Port& p);
    Port& operator+=(int b);
    Port& operator-=(int b);
    int BottleCount() const {
    
     return bottles; }
    virtual void Show() const;
    friend ostream& operator<<(ostream& os, const Port& p);
};
class VintagePort : public Port
{
    
    
private:
    char* nickname;
    int year;
    public:
    VintagePort();
    VintagePort(const char* br, const char* st, int b, const char* nn, int y);
    VintagePort(const VintagePort& vp);
    ~VintagePort() {
    
     delete[] nickname; }
    VintagePort& operator=(const VintagePort& vp);
    void Show() const;
    friend ostream& operator<<(ostream& os, const VintagePort& vp);
};
#endif

#include<iostream>
#include"diyi.h"
#pragma warning(disable:4996)    //这里vs有个4996警告
Port::Port(const char* br, const char* st, int b)
{
    
    
 brand = new char[std::strlen(br) + 1];
 std::strcpy(brand, br);
 std::strncpy(style, st, 19);
 bottles = b;
}
Port::Port(const Port& p)
{
    
    
 brand = new char[std::strlen(p.brand) + 1];
 std::strcpy(brand, p.brand);
 std::strncpy(style, p.style, 19);
 bottles = p.bottles;
}
Port& Port::operator=(const Port& p)
{
    
    
 if (this == &p)
  return *this;
 delete[]brand;
 brand = new char[std::strlen(p.brand) + 1];
 std::strcpy(brand, p.brand);
 std::strncpy(style, p.style, 19);
 bottles = p.bottles;
 return *this;
}
Port& Port::operator+=(int b)
{
    
    
 bottles += b;
 return *this;
}
Port& Port::operator-=(int b)
{
    
    
 if (b > bottles)
  std::cout << "no!";
 bottles -= b;
 return *this;
}
void Port::Show()const
{
    
    
 std::cout << "brand: " << brand << std::endl;
 std::cout << "kind: " << style << std::endl;
 std::cout << "bottles: " << bottles << std::endl;
}
std::ostream& operator<<(std::ostream& os, const Port& p)
{
    
    
 os << p.brand << " ," << p.style << " ," << p.bottles << std::endl;
 return os;
}
VintagePort::VintagePort():Port()
{
    
    
 nickname = 0;
 year = 0;
}
VintagePort::VintagePort(const char* br, const char* st, int b,const char* nn, int y):Port(br,st,b)
{
    
    
 nickname = new char[std::strlen(nn) + 1];
 std::strcpy(nickname, nn);
 year = y;
}
VintagePort::VintagePort(const VintagePort& vp):Port(vp)
{
    
    
 nickname = new char[std::strlen(vp.nickname) + 1];
 std::strcpy(nickname, vp.nickname);
 year = vp.year;
}
VintagePort& VintagePort::operator=(const VintagePort& vp)
{
    
    
 if (this == &vp)
  return *this;
 Port::operator=(vp);
 delete[]nickname;
 nickname = new char[std::strlen(vp.nickname) + 1];
 std::strcpy(nickname, vp.nickname);
 year = vp.year;
 return *this;
}
void VintagePort::Show()const
{
    
    
 Port::Show();
 std::cout << "nickname: " << nickname << std::endl;
 std::cout << "year: " << year << std::endl;
}
std::ostream& operator<<(std::ostream& os, const VintagePort& vp)
{
    
    
 os << (const Port&)vp;
 os << "nickname； " << vp.nickname << std::endl;
 os << "year: " << vp.year << std::endl;
 return os;
}

#include <iostream>
#include <string>
#include "diyi.h"
using std::cout;
using std::endl;
int main()
{
    
    
    Port port1("gallo", "tawny", 20);
    cout << port1 << endl << endl;
    VintagePort vp("gallo", "vintage", 24, "Old Velvet", 16);
    VintagePort vp2(vp);
    cout << vp2 << endl << endl;
    VintagePort vp3;
    vp3 = vp;
    cout << vp3 << endl << endl;
    Port* p_port;
    p_port = &port1;
    p_port->Show();
    cout << endl;
    p_port = &vp;
    p_port->Show();
    cout << endl;
    return 0;
}