【13.4】c++ primer plus 課後編程答案

C++ PRIMER PLUS 課後答案 
使用IDE爲window7系統下的VS2010

/*user.h*/
#ifndef USERSH_H_
#define USERSH_H_
#include <string>
using std::ostream;
using std::istream;
using std::string;

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 *nm, 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

/*userfucntion.cpp*/
#include "usersh.h"
#include <iostream>
#include <cstring>
using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::ostream;
using std::istream;

Port::Port(const char * br /* = "none" */, const char * st /* = "none" */, int b /* = 0 */)
{
	brand = new char [strlen(br) + 1];
	strcpy(brand, br);
	strcpy(style, st);
	bottles = b;
}

Port::Port(const Port & p)
{
	brand = new char [strlen(p.brand) + 1];
	strcpy(brand, p.brand);
	strcpy(style, p.style);
	bottles = p.bottles;
}

Port & Port::operator = (const Port & p)
{
	if(this == &p)
		return * this;
	delete [] brand;
	brand = new char [strlen(p.brand) + 1];
	strcpy(brand, p.brand);
	strcpy(style, p.style);
	bottles = p.bottles;
	return * this;
}

Port & Port::operator += (int b)
{
	bottles += b;
	return * this;
}

Port & Port::operator -=(int b)
{
	bottles -= b;
	return * this;
}

void Port::Show()const
{
	cout << "Brand: " << brand <<endl;
	cout << "Style: " << style <<endl;
	cout << "Bottles: " << bottles <<endl;
}

ostream & operator << (ostream & os, const Port & p)
{
	os << p.brand <<", ";
	os << p.style <<", ";
	os << p.bottles <<", ";
	return os;
}


VintagePort::VintagePort()
	:Port()
{
	nickname = new char [5];
	strcpy(nickname, "none");
	year = 0;
}

VintagePort::VintagePort(const char * br, const char *st, int b, const char *nm, int y)
	: Port(br,st,b)
{
	nickname = new char [strlen(nm) + 1];
	strcpy(nickname, nm);
	year = y;
}

VintagePort::VintagePort(const VintagePort & vp)
	:Port(vp)
{
	nickname = new char [strlen(vp.nickname) + 1];
	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 [strlen(vp.nickname) + 1];
	strcpy(nickname, 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;
	os << vp.nickname << ", ";
	os << vp.year << ". ";
	return os;
}

/*main*/
#include <iostream>
#include <Windows.h>
#include <cstring>
#include "usersh.h"

using std::cout;
using std::cin;
using std::endl;



int main()
{   
	Port a;
	a.Show();
	Port b("123", "456", 20);
	cout << b << endl;
	b+=1;
	b.Show();
	a=b;
	a-=2;
	cout << a << endl << endl;

	VintagePort aa;
	aa.Show();
	VintagePort bb("aaa", "bbb", 1, "ccc", 1995);
	aa=bb;
	aa+=1;
	aa.Show();
	aa-=2;
	aa.Show();
	cout << aa << endl;

	system("pause");
	return 0;
}