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问题:

解答:
main.cpp

#include <iostream>

#include "port.h"

int main() {
	Port p1;
	Port p2("Abc", "Bcc", 30);
	std::cout << p1 << std::endl<<endl;
	std::cout << p2 << std::endl << endl;
	Port p3 = p2;
	p3.Show();
	p3 += 3;
	p3.Show();
	Port p4 = p2;
	p3 -= 2;
	p3.Show();
	cout << endl;

	VintagePort vp1("Vabc", 50, "hn", 1983);
	vp1.Show();
	cout << endl;
	VintagePort vp2;
	vp2.Show();
	cout << endl;
	vp1 -= 3;
	vp2 = vp1;
	std::cout << vp2 << std::endl;

	return 0;
}

port.h

#pragma once
#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,int b,const char*nn,int y);
	VintagePort(const VintagePort&vp);
	~VintagePort() { delete[] nickname; }
	VintagePort& operator=(const VintagePort&vp);
	void Show()const override;
	friend ostream& operator<<(ostream& os, const VintagePort& vp);
};

port.cpp

#include "port.h"

Port::Port(const char* br, const char* st, int b)
{
	brand = new char[strlen(br) + 1];
	strcpy_s(brand, strlen(br) + 1, br);
	strcpy_s(style, strlen(br) + 1, st);
	bottles = b;
}
Port::Port(const Port& p)
{
	brand = new char[strlen(p.brand) + 1];
	strcpy_s(brand, strlen(p.brand) + 1, p.brand);
	strcpy_s(style, strlen(p.style) + 1, p.style);
	bottles = p.bottles;
}
Port& Port::operator=(const Port& p)
{
	if (this == &p)return *this;
	if (brand)delete[] brand;
	brand = new char[strlen(p.brand) + 1];
	strcpy_s(brand, strlen(p.brand) + 1, p.brand);
	strcpy_s(style, strlen(p.style) + 1, p.style);
	bottles = p.bottles;
	return *this;
}
Port& Port::operator+=(int b)
{
	this->bottles += b;
	return *this;
}
Port& Port::operator-=(int b)
{
	this->bottles -= b;
	return *this;
}
void Port::Show()const
{
	cout << "Brand:" << this->brand << endl;
	cout << "Kind:" << this->style << endl;
	cout << "Bottles:" << this->bottles << endl;
}
ostream& operator<<(ostream& os, const Port& p)
{
	os << p.brand << "," << p.style << "," << p.bottles;
	return os;
}


VintagePort::VintagePort():Port()
{
	nickname = new char[1];
	nickname[0] = '\0';
	year = 0;
}
VintagePort::VintagePort(const char* br, int b, const char* nn, int y):Port(br,"none",b)
{
	nickname = new char[strlen(nn) + 1];
	strcpy_s(nickname, strlen(nn) + 1, nn);
	year = y;
}
VintagePort::VintagePort(const VintagePort& vp):Port(vp)
{
	nickname = new char[strlen(vp.nickname) + 1];
	strcpy_s(nickname, strlen(vp.nickname) + 1, vp.nickname);
	year = vp.year;
}
VintagePort& VintagePort::operator=(const VintagePort& vp)
{
	if (this == &vp)return *this;
	if (nickname)delete[] nickname;
	Port::operator=(vp);
	nickname = new char[strlen(vp.nickname) + 1];
	strcpy_s(nickname, strlen(vp.nickname) + 1, vp.nickname);
	year = vp.year;
	return *this;
}
void VintagePort::Show()const
{
	Port::Show();
	cout << "nickname:" << nickname << endl;
	cout << "year:" << year << endl;
}
ostream& operator<<(ostream& os, const VintagePort& vp)
{
	os << (const Port&)vp << "," << vp.nickname << "," << vp.year << endl;
	return os;
}

运行结果:

考查点:

• 继承
• 虚函数

2024年9月9日16:05:29