C++PrimerPlus学习——第十三章编程练习

13-1
注意char*前面加const，不然就会报错
Classis.h

#ifndef CLASSIC_H_
#define CLASS_H_
#include <string>
class Cd {private:char performers[50];char label[20];int selections;double playtime;
public:Cd(const char* s1, const char* s2, int n, double x);Cd(const Cd& ｄ);Cd();virtual ~Cd();virtual void Report() const;virtual Cd& operator=(const Cd& d);
};
class Classic:public Cd
{private:char major[50];
public:Classic(const char* s1, const char* s2, const char* s3, int n, double x);Classic();~Classic();void Report();Classic& operator=(const Classic& d);
};
#endif // !CLASSIC_H_

Classic.cpp

#include <iostream>
#include "Classic.h"Cd::Cd(const char* s1, const char* s2, int n, double x)
{strcpy_s(performers, strlen(s1) + 1, s1);strcpy_s(label, strlen(s2) + 1, s2);selections = n;playtime = x;
}
Cd::Cd(const Cd& d)
{strcpy_s(performers, strlen(d.performers) + 1, d.performers);strcpy_s(label, strlen(d.label) + 1, d.label);selections = d.selections;playtime = d.playtime;
}
Cd::Cd()
{performers[0] = '\0';label[0] = '\0';selections = 0;playtime = 0.0;
}
Cd::~Cd()
{}
void Cd::Report() const
{std::cout << "Preformers: " << performers << '\n';std::cout << "Label: " << label << '\n';std::cout << "selectiongs: " << selections << '\n';std::cout << "playtime: " << playtime << '\n';
}
Cd& Cd::operator=(const Cd& d)
{if (this == &d)return *this;strcpy_s(performers, strlen(d.performers) + 1, d.performers);strcpy_s(label, strlen(d.label) + 1, d.label);selections = d.selections;playtime = d.playtime;return *this;
}
Classic::Classic(const char* s1, const char* s2, const char* s3, int n, double x):Cd(s2, s3, x, n)
{strcpy_s(major, strlen(s1)+1, s1);
}
Classic::Classic():Cd()
{major[0] = '\0';
}
Classic::~Classic()
{}
void Classic::Report()
{Cd::Report();std::cout << "Major: " << major << '\n';
}
Classic& Classic::operator=(const Classic& d)
{if (this == &d)return *this;Cd::operator=(d);strcpy_s(major, strlen(d.major) + 1, d.major);return *this;
}

main.cpp

#include <iostream>
#include "Classic.h"
using std::cout;
void Bravo(const Cd& disk);int main()
{Cd c1("Beatles", "Capitol", 14, 35.5);Classic c2 = Classic("Piano Sonata in B flat, Fantasia in C", "Alfred Brendel", "Philips", 2, 57.17);Cd* pcd = &c1;cout<<"Using object directly:\n";c1.Report();c2.Report();cout << "Calling a function with a Cd reference argument:\n";Bravo(c1);Bravo(c2);cout << "Testing assignment: ";Classic copy;copy = c2;copy.Report();return 0;
}void Bravo(const Cd& disk)
{disk.Report();
}

13-2
主函数仍然不变
Classic.h

#ifndef CLASSIC_H_
#define CLASSIC_H_
#include <string>
class Cd {private:char* performers;char* label;int selections;double playtime;
public:Cd(const char* s1, const char* s2, int n, double x);Cd(const Cd& ｄ);Cd();virtual ~Cd();virtual void Report() const;virtual Cd& operator=(const Cd& d);
};
class Classic:public Cd
{private:char* major;
public:Classic(const char* s1, const char* s2, const char* s3, int n, double x);Classic();~Classic();void Report();Classic& operator=(const Classic& d);
};
#endif // !CLASSIC_H_

Classic.cpp

#include <iostream>
#include "Classic.h"Cd::Cd(const char* s1, const char* s2, int n, double x)
{performers = new char[strlen(s1) + 1];strcpy_s(performers, strlen(s1) + 1, s1);label = new char[strlen(s2) + 1];strcpy_s(label, strlen(s2) + 1, s2);selections = n;playtime = x;
}
Cd::Cd(const Cd& d)
{performers = new char[strlen(d.performers) + 1];strcpy_s(performers, strlen(d.performers) + 1, d.performers);label = new char[strlen(d.label) + 1];strcpy_s(label, strlen(d.label) + 1, d.label);selections = d.selections;playtime = d.playtime;
}
Cd::Cd()
{performers = new char[1];performers[0] = '\0';label = new char[1];label[0] = '\0';selections = 0;playtime = 0.0;
}
Cd::~Cd()
{delete[] performers;delete[] label;
}
void Cd::Report() const
{std::cout << "Preformers: " << performers << '\n';std::cout << "Label: " << label << '\n';std::cout << "selectiongs: " << selections << '\n';std::cout << "playtime: " << playtime << '\n';
}
Cd& Cd::operator=(const Cd& d)
{if (this == &d)return *this;delete[] performers;delete[] label;performers = new char[strlen(d.performers) + 1];strcpy_s(performers, strlen(d.performers) + 1, d.performers);label = new char[strlen(d.label) + 1];strcpy_s(label, strlen(d.label) + 1, d.label);selections = d.selections;playtime = d.playtime;return *this;
}
Classic::Classic(const char* s1, const char* s2, const char* s3, int n, double x):Cd(s2, s3, x, n)
{major = new char[strlen(s1) + 1];strcpy_s(major, strlen(s1)+1, s1);
}
Classic::Classic():Cd()
{major = new char[1];major[0] = '\0';
}
Classic::~Classic()
{delete[] major;
}
void Classic::Report()
{Cd::Report();std::cout << "Major: " << major << '\n';
}
Classic& Classic::operator=(const Classic& d)
{if (this == &d)return *this;Cd::operator=(d);delete[] major;major = new char[strlen(d.major) + 1];strcpy_s(major, strlen(d.major) + 1, d.major);return *this;
}

13-3
虽然不是很理解，但是这个套路是明白了
dma.h

#ifndef DMA_H_
#define DMA_H_
#include <iostream>class ABC
{char* fullname;int level;
public:ABC(const char* f = "null", int I = 0);ABC(const ABC& ab);virtual ~ABC();ABC& operator=(const ABC& ab);virtual void show();
};class baseDMA: public ABC
{private:char* label;int rating;
public:baseDMA(const char* l = "null", int r = 0, const char* f = "null", int lv = 0);baseDMA(const baseDMA& rs);~baseDMA();baseDMA& operator=(const baseDMA& rs);virtual void show();
};class lacksDMA: public ABC
{private:enum{ COL_LEN = 40 };char color[COL_LEN];
public:lacksDMA(const char* c = "blank", const char* l = "null", int r = 0);lacksDMA(const char* c, const baseDMA& rs);virtual void show();
};class hasDMA: public ABC
{private:char* style;
public:hasDMA(const char* s = "none", const char* l = "null", int r = 0);hasDMA(const char* s, const baseDMA& hs);hasDMA(const hasDMA& hs);~hasDMA();hasDMA& operator=(const hasDMA& rs);virtual void show();
};
#endif // !DMA_H_

dma.cpp

#include<cstring>
#include<string>
#include "dma.h"ABC::ABC(const char* a, int b)
{fullname = new char[strlen(a) + 1];strcpy_s(fullname, strlen(a) + 1, a);level = b;
}
ABC::ABC(const ABC& ab)
{fullname = new char[strlen(ab.fullname) + 1];strcpy_s(fullname, strlen(ab.fullname) + 1, ab.fullname);level = ab.level;
}
ABC::~ABC()
{delete[] fullname;
}
ABC& ABC::operator=(const ABC& ab)
{if (this == &ab)return *this;delete[] fullname;fullname = new char[strlen(ab.fullname) + 1];strcpy_s(fullname, strlen(ab.fullname) + 1, ab.fullname);level = ab.level;return *this;
}
void ABC::show()
{std::cout << "fullname: " << fullname << std::endl;std::cout << "level: " << level << std::endl;
}baseDMA::baseDMA(const char* l, int r, const char* f, int lv):ABC(f, lv)
{label = new char[strlen(l) + 1];strcpy_s(label, strlen(l) + 1, l);rating = r;
}
baseDMA::baseDMA(const baseDMA& rs):ABC(rs)
{label = new char[strlen(rs.label) + 1];strcpy_s(label, strlen(rs.label) + 1, rs.label);rating = rs.rating;
}
baseDMA::~baseDMA()
{delete[] label;
}
baseDMA& baseDMA::operator=(const baseDMA& rs)
{if (this == &rs)return *this;ABC::operator=(rs);delete[] label;label = new char[strlen(rs.label) + 1];strcpy_s(label, strlen(rs.label) + 1, rs.label);rating = rs.rating;return *this;
}
void baseDMA::show()
{ABC::show();std::cout << "label: " << label << std::endl;std::cout << "rating: " << rating << std::endl;
}
lacksDMA::lacksDMA(const char* c, const char* l, int r):ABC(l, r)
{strcpy_s(color, strlen(c) + 1, c);
}
lacksDMA::lacksDMA(const char* c, const baseDMA& rs):ABC(rs)
{strcpy_s(color, strlen(c) + 1, c);
}
void lacksDMA::show()
{ABC::show();std::cout << "color: " << color << std::endl;
}
hasDMA::hasDMA(const char* s, const char* l, int r):ABC(l, r)
{style = new char[strlen(s) + 1];strcpy_s(style, strlen(s) + 1, s);
}
hasDMA::hasDMA(const char* s, const baseDMA& hs):ABC(hs)
{style = new char[strlen(s) + 1];strcpy_s(style, strlen(s) + 1, s);
}
hasDMA::hasDMA(const hasDMA& hs):ABC(hs)
{style = new char[strlen(hs.style) + 1];strcpy_s(style, strlen(hs.style) + 1, hs.style);
}
hasDMA::~hasDMA()
{delete[] style;
}
hasDMA& hasDMA::operator=(const hasDMA& hs)
{if (this == &hs)return *this;ABC::operator=(hs);delete[] style;style = new char[strlen(hs.style) + 1];strcpy_s(style, strlen(hs.style) + 1, hs.style);return *this;
}
void hasDMA::show()
{ABC::show();std::cout << "style: " << style << std::endl;
}

main.cpp

#include <iostream>
#include "dma.h"
using std::cout;int main()
{baseDMA a1("asdfadsf", 9, "dsfadfa", 1);lacksDMA a2("dfafda", "daf d", 2);hasDMA a3("sdfadfas", "dfqwedsa", 3);cout << "baseDMA:\n";a1.show();cout << "lacksDMA:\n";a2.show();cout << "hasDMA:\n";a3.show();baseDMA a4 = a1;lacksDMA a5 = a2;hasDMA a6 = a3;return 0;
}

13-4
Port.h

#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; }void Show() const;friend ostream& operator<<(ostream& os, const VintagePort& vp);
};
#endif // !PORT_H_

Port.cpp

#include "Port.h"
#include <cstring>
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, 20, 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, 20, 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_s(brand, strlen(p.brand) + 1, p.brand);strcpy_s(style, p.style);bottles = p.bottles;return *this;return *this;// TODO: 在此处插入 return 语句
}Port& Port::operator+=(int b)
{bottles += b;return *this;// TODO: 在此处插入 return 语句
}Port& Port::operator-=(int b)
{bottles -= b;return *this;    // TODO: 在此处插入 return 语句
}void Port::Show() const
{std::cout << "Brand: " << brand << std::endl;std::cout << "King: " << style << std::endl;std::cout << "Bottles: " << bottles << std::endl;
}ostream& operator<<(ostream& os, const Port& p)
{std::cout << p.brand << ", " << p.style << ", " << p.bottles << std::endl;return os;// TODO: 在此处插入 return 语句
}ostream& operator<<(ostream& os, const VintagePort& vp)
{os << (const Port&)vp;std::cout << vp.nickname << ", " << vp.year << std::endl;return os;// TODO: 在此处插入 return 语句
}VintagePort::VintagePort()
{nickname = new char[1];nickname[0] = '\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[strlen(nn) + 1];strcpy_s(nickname, strlen(nn) + 1, nn);year = y;
}VintagePort::VintagePort(const VintagePort& vp)
{nickname = new char[strlen(vp.nickname) + 1];strcpy_s(nickname, strlen(vp.nickname), vp.nickname);year = vp.year;
}void VintagePort::Show() const
{Port::Show();std::cout << "Nickname: " << nickname << std::endl;std::cout << "Year: " << year << std::endl;
}

main.cpp

#include <iostream>
#include "Port.h"
using std::cout;int main()
{Port wine1("Gallo", "tawny", 20);VintagePort wine2("Romance Conti", "vintage", 10, "The Noble", 1876);VintagePort wine3("Merlot", "ruby", 30, "Old Velvet", 1888);cout << "Show Port object:\n";wine1.Show();cout << wine1 << endl;cout << "Show VintagePort object:\n";wine2.Show();cout << wine2 << endl;cout << "Show VintagePort object:\n";wine3.Show();cout << wine3 << endl;Port(wine4) = wine1;cout << "Show VintagePort object:\n";wine4.Show();cout << wine4<< endl;return 0;
}

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