C++Primer Plus笔记——第十四章 C++中的代码重用课后编程练习答案
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编程练习答案
习题1 习题2 习题3 习题4 习题5
习题1
//winec.h
#ifndef WINEC_H_
#define WINEC_H_
#include <iostream>
#include <string>
#include <valarray>
using namespace std;
template<class T1, class T2>
class Pair
{
private:
T1 year;
T2 bottles;
public:
Pair(const T1 &yr, const T2 &bt) :year(yr), bottles(bt) {}
Pair() {}
void Set(const T1 &yr, const T2 &bt);
int Sum()const;
void Show(int y)const;
};
template<class T1, class T2>
void Pair<T1, T2>::Set(const T1 &yr, const T2 &bt)
{
year = yr;
bottles = bt;
}
template<class T1, class T2>
int Pair<T1, T2>::Sum()const
{
return bottles.sum();
}
template<class T1, class T2>
void Pair<T1, T2>::Show(int y)const
{
for (inti = 0; i < y; i++)
cout << "\t" << year[i] << "\t" << bottles[i] << endl;
}
typedef valarray<int>ArrayInt;
typedef Pair<ArrayInt, ArrayInt>PairArray;
class Wine
{
private:
PairArray yb;
string fullname;
int yrs;
public:
Wine() {}
Wine(const char *l, int y, const int yr[], const int bot[]);
Wine(const char *l, int y);
voidGetBottles();
string&Label();
void Show()const;
int sum()const;
};
#endif
//winec.cpp
#include "winec.h"
Wine::Wine(const char *l, int y, const int yr[], const int bot[])
{
fullname = l;
yrs = y;
yb.Set(ArrayInt(yr, yrs), ArrayInt(bot, yrs));
}
Wine::Wine(const char *l, int y)
{
fullname = l;
yrs = y;
}
void Wine::GetBottles()
{
ArrayInt yr(yrs), bt(yrs);
for (int i = 0; i < yrs; i++)
{
cout << "Enter the year: ";
cin >> yr[i];
cout << "Enter the bottles: ";
cin >> bt[i];
}
while (cin.get() != '\n')
continue;
yb.Set(yr, bt);
}
string&Wine::Label()
{
return fullname;
}
void Wine::Show()const
{
cout << "Wine: " << fullname << endl;
cout << "\tYear\tBottles\n";
yb.Show(yrs);
}
int Wine::sum()const
{
return yb.Sum();
}
//main.cpp
#include "winec.h"
int main(void)
{
cout << "Enter name of wine: ";
char lab[50];
cin.getline(lab, 50);
cout << "Enter number of years: ";
int yrs;
cin >> yrs;
Wine holding(lab, yrs);
holding.GetBottles();
holding.Show();
const int YRS = 3;
int y[YRS] = { 1993, 1995, 1998 };
int b[YRS] = { 48, 60, 72 };
Wine more("Gushing Grape Red", YRS, y, b);
more.Show();
cout << "Total bottles for " << more.Label()
<< ": " << more.sum() << endl;
cout << "Bye\n";
system("pause");
return 0;
}
习题2
//winec.h
#ifndef WINEC_H_
#define WINEC_H_
#include <iostream>
#include <string>
#include <valarray>
using namespace std;
template<class T1, class T2>
class Pair
{
private:
T1 year;
T2 bottles;
public:
Pair(const T1 &yr, const T2 &bt) :year(yr), bottles(bt) {}
Pair() {}
void Set(const T1 &yr, const T2 &bt);
int Sum()const;
void Show(int y)const;
};
template<class T1, class T2>
void Pair<T1, T2>::Set(const T1 &yr, const T2 &bt)
{
year = yr;
bottles = bt;
}
template<class T1, class T2>
int Pair<T1, T2>::Sum()const
{
return bottles.sum();
}
template<class T1, class T2>
void Pair<T1, T2>::Show(int y)const
{
for (int i = 0; i < y; i++)
cout << "\t" << year[i] << "\t" << bottles[i] << endl;
}
typedef valarray<int>ArrayInt;
typedef Pair<ArrayInt, ArrayInt>PairArray;
class Wine :private PairArray, private string
{
private:
int yrs;
public:
Wine() {}
Wine(const char *l, int y, const int yr[], const int bot[]);
Wine(const char *l, int y);
voidGetBottles();
string&Label();
void Show()const;
int sum()const;
};
#endif
//winec.cpp
#include "winec.h"
Wine::Wine(const char *l, int y, const int yr[], const int bot[]) :string(l), yrs(y), PairArray(ArrayInt(yr,
y), ArrayInt(bot, y))
{
}
Wine::Wine(const char *l, int y) : string(l), yrs(y)
{
}
void Wine::GetBottles()
{
ArrayInt yr(yrs), bt(yrs);
for (int i = 0; i < yrs; i++)
{
cout << "Enter the year: ";
cin >> yr[i];
cout << "Enter the bottles: ";
cin >> bt[i];
}
while (cin.get() != '\n')
continue;
PairArray::Set(yr, bt);
}
string&Wine::Label()
{
return (string &)(*this);
}
void Wine::Show()const
{
cout << "Wine: " << (string &)(*this) << endl;
cout << "\tYear\tBottles\n";
PairArray::Show(yrs);
}
int Wine::sum()const
{
return PairArray::Sum();
}
//main.cpp
#include "winec.h"
int main(void)
{
cout << "Enter name of wine: ";
char lab[50];
cin.getline(lab, 50);
cout << "Enter number of years: ";
int yrs;
cin >> yrs;
Wine holding(lab, yrs);
holding.GetBottles();
holding.Show();
const int YRS = 3;
int y[YRS] = { 1993, 1995, 1998 };
int b[YRS] = { 48, 60, 72 };
Wine more("Gushing Grape Red", YRS, y, b);
more.Show();
cout << "Total bottles for " << more.Label()
<< ": " << more.sum() << endl;
cout << "Bye\n";
system("pause");
return 0;
}
习题3
//queuetp.h
#ifndef QUEUETP_H_
#define QUEUETP_H_
#include <iostream>
#include <string>
#include <cstring>
using namespace std;
template<typename T>
class QueueTp
{
private:
struct Node { T item; struct Node *next; };
Node *front;
Node *rear;
int items;
const int qsize;
QueueTp(constQueueTp&q) :qsize(0) {}
QueueTp&operator=(const QueueTp&q) { return *this; }
public:
QueueTp(int qs = 10);
~QueueTp();
bool isempty()const;
bool isfull()const;
int queuecount()const;
bool enqueue(const T &item);
bool dequeue(T &item);
};
template<typename T>
QueueTp<T>::QueueTp(int qs) :qsize(qs)
{
front = rear = NULL;
items = 0;
}
template<typename T>
QueueTp<T>::~QueueTp()
{
Node *temp;
while (front != NULL)
{
temp = front;
front = front->next;
delete temp;
}
}
template<typename T>
bool QueueTp<T>::isempty()const
{
return items == 0;
}
template<typename T>
bool QueueTp<T>::isfull()const
{
return items == qsize;
}
template<typename T>
int QueueTp<T>::queuecount()const
{
return items;
}
template<typename T>
bool QueueTp<T>::enqueue(const T &item)
{
if (isfull())
return false;
Node *add = new Node;
add->item = item;
add->next = NULL;
items++;
if (front == NULL)
front = add;
else
rear->next = add;
rear = add;
return true;
}
template<typename T>
bool QueueTp<T>::dequeue(T &item)
{
if (front == NULL)
return false;
item = front->item;
items--;
Node *temp = front;
front = front->next;
delete temp;
if (items == 0)
rear = NULL;
return true;
}
class Worker
{
private:
string fullname;
long id;
public:
Worker() :fullname("no one"), id(0L) {}
Worker(const string &s, long n) :fullname(s), id(n) {}
~Worker();
void Set();
void Show()const;
};
#endif
//workermi.cpp
#include "queuetp.h"
Worker::~Worker() {}
void Worker::Show()const
{
cout << "Name: " << fullname << endl;
cout << "Employee ID: " << id << endl;
}
void Worker::Set()
{
cout << "Enter worker's name: ";
getline(cin, fullname);
cout << "Enter worker's ID: ";
cin >> id;
while (cin.get() != '\n')
continue;
}
//main.cpp
#include "queuetp.h"
const int Size = 5;
int main()
{
QueueTp<Worker *>lolas(Size);
Worker *temp;
int ct;
for (ct = 0; ct < Size; ct++)
{
char ch;
cout << "Enter the command:\n"
<< "A or a enter queue, "
<< "P or p delete queue, "
<< "Q or q quit.\n";
cin >> ch;
while (strchr("apq", ch) == NULL)
{
cout << "Please enter a p or q: ";
cin >> ch;
}
if (ch == 'q')
break;
switch (ch)
{
case'a':
temp = new Worker;
cin.get();
temp->Set();
if (lolas.isfull())
cout << "Queue already full\n";
else
lolas.enqueue(temp);
break;
case'p':
if (lolas.isempty())
cout << "Queue already empty\n";
else
lolas.dequeue(temp);
break;
}
}
cout << "\nHere the total count: ";
cout << lolas.queuecount();
cout << "Done.\n";
system("pause");
return 0;
}
习题4
//person.h
#ifndef PERSON_H_
#define PERSON_H_
#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>
using namespace std;
class Person
{
private:
string firstname;
string lastname;
protected:
virtual void Data()const;
virtual void Get();
public:
Person() :firstname("no one"), lastname("no one") {}
Person(const string &f, const string &l) :firstname(f), lastname(l) {}
Person(const Person &p) :Person(p) {}
virtual ~Person() = 0;
virtual void Set() = 0;
virtual void Show()const = 0;
};
class Gunslinger :virtual public Person
{
private:
int numsk;
protected:
void Data()const;
void Get();
public:
Gunslinger() :numsk(0), Person() {}
Gunslinger(int nk, const string &f, const string &l) :numsk(nk), Person(f, l) {}
Gunslinger(int nk, const Person &p) :numsk(nk), Person(p) {}
void Show()const;
void Set();
double Draw()const;
}；
class PokerPlayer :virtual public Person
{
protected:
void Data()const;
public:
PokerPlayer() :Person() {}
PokerPlayer(const string &f, const string &l) : Person(f, l) {}
PokerPlayer(const Person &p) :Person(p) {}
int Draw()const;
void Show()const;
void Set() { Person::Set(); }
};
class BadDude :public Gunslinger, public PokerPlayer
{
protected:
void Data()const;
void Get();
public:
BadDude() {}
BadDude(int nk, const string &f, const string &l) :Person(f, l), Gunslinger(nk, f, l), PokerPlayer(f, l) {}
BadDude(int nk, const Person &p) :Person(p), Gunslinger(nk, p), PokerPlayer(p) {}
BadDude(const Gunslinger &g) :Person(g), Gunslinger(g), PokerPlayer(g) {}
BadDude(int nk, const PokerPlayer &po) :Person(po), Gunslinger(nk, po), PokerPlayer(po) {}
double Gdraw()const;
int Cdraw()const;
void Set();
void Show()const;
};
#endif
//person.cpp
#include "person.h"
Person::~Person() {}
void Person::Data()const
{
cout << "First name is : " << firstname << endl;
cout << "Last name is : " << lastname << endl;
}
void Person::Get()
{
cout << "Enter first name: \n";
getline(cin, firstname);
cout << "Enter last name: \n";
getline(cin, lastname);
}
void Person::Show()const
{
Data();
}
void Person::Set()
{
Get();
}
void Gunslinger::Data()const
{
cout << "Nick is :" << numsk << endl;
cout << "The time of get the gun :" << Gunslinger::Draw() << endl;
}
void Gunslinger::Get()
{
cout << "Enter Nick: \n";
cin >> numsk;
}
void Gunslinger::Set()
{
cout << "Enter Guns name: \n";
Person::Get();
Get();
}
void Gunslinger::Show()const
{
cout << "Gunslinger: \n";
Person::Data();
Data();
}
double Gunslinger::Draw()const
{
return rand() % 3 + 1;
}
intPokerPlayer::Draw()const
{
return rand() % 52 + 1;
}
voidPokerPlayer::Data()const
{
cout << "The cards :" << Draw() << endl;
}
voidPokerPlayer::Show()const
{
cout << "PokerPlayer :\n";
Person::Data();
Data();
}
doubleBadDude::Gdraw()const
{
return Gunslinger::Draw();
}
intBadDude::Cdraw()const
{
return PokerPlayer::Draw();
}
voidBadDude::Data()const
{
Gunslinger::Data();
PokerPlayer::Data();
cout << "The next cards: " << Cdraw() << endl;
cout << "The time of BadDude get the gun: " << Gdraw() << endl;
}
voidBadDude::Get()
{
Gunslinger::Get();
}
voidBadDude::Set()
{
cout << "Enter BadDude name: \n";
Person::Get();
Get();
}
voidBadDude::Show()const
{
cout << "BadDude: \n";
Person::Data();
Data();
}
//main.cpp
#include "person.h"
const int Size = 5;
int main()
{
Person *per[Size];
int ct;
for (ct = 0; ct < Size; ct++)
{
char choice;
cout << "Enter the Person: \n"
<< "g: gunslinger p: poker "
<< "b: bad dude q: quit\n";
cin >> choice;
while (strchr("gpbq", choice) == NULL)
{
cout << "Please enter a p,g,o,q: ";
cin >> choice;
}
if (choice == 'q')
break;
switch (choice)
{
case'g':
per[ct] = new Gunslinger;
break;
case'p':
per[ct] = new PokerPlayer;
break;
case'b':
per[ct] = new BadDude;
break;
}
cin.get();
per[ct]->Set();
}
cout << "\nHere is your staff:\n";
int i;
for (i = 0; i < ct; i++)
{
cout << endl;
per[i]->Show();
}
for (i = 0; i < ct; i++)
delete per[i];
cout << "Bye\n";
system("pause");
return 0;
}
习题5
//emp.h
#ifndef EMP_H_
#define EMP_H_
#include <iostream>
#include <string>
using namespace std;
class abstr_emp
{
private:
string fname;
string lname;
string job;
public:
abstr_emp();
abstr_emp(const string &fn, const string &ln,
const string &j);
virtual void ShowAll()const;
virtual void SetAll();
friend ostream&operator<<(ostream&os, const abstr_emp&e);
virtual ~abstr_emp() = 0;
};
class employee :public abstr_emp
{
public:
employee();
employee(const string &fn, const string &ln,
const string &j);
virtual void ShowAll()const;
virtual void SetAll();
};
class manager :virtual public abstr_emp
{
private:
int inchargeof;
protected:
intInChargeOf()const { return inchargeof; }
int&InChargeOf() { return inchargeof; }
public:
manager();
manager(const string &fn, const string &ln,
const string &j, int ico = 0);
manager(const abstr_emp&e, int ico = 0);
manager(const manager &m);
virtual void ShowAll()const;
virtual void SetAll();
void getInCharge() {
cout << "Enter inchargeof: ";
cin >> inchargeof;
}
};
class fink :virtual public abstr_emp
{
private:
string reportsto;
protected:
const string ReportsTo()const { return reportsto; }
string &ReportsTo() { return reportsto; }
public:
fink();
fink(const string &fn, const string &ln,
const string &j, const string &rpo);
fink(const abstr_emp&e, const string &rpo);
fink(const fink &e);
virtual void ShowAll()const;
virtual void SetAll();
void getReportsTo() {
cout << "Enter reportsto: ";
cin >> reportsto;
}
};
class highfink :public manager, public fink
{
public:
highfink();
highfink(const string &fn, const string &ln,
const string &j, const string &rpo, int ico = 0);
highfink(const abstr_emp&e, const string &rpo, intico = 0);
highfink(const fink &f, int ico = 0);
highfink(const manager &m, const string &rpo);
highfink(const highfink&h);
virtual void ShowAll()const;
virtual void SetAll();
};
#endif
//emp.cpp
#include "emp.h"
abstr_emp::abstr_emp() :fname("no one"), lname("no one"), job("no job")
{
}
abstr_emp::abstr_emp(const string &fn, const string &ln,
const string &j) : fname(fn), lname(ln), job(j)
{
}
void abstr_emp::ShowAll()const
{
cout << "Firstname: " << fname << endl;
cout << "Lastname: " << lname << endl;
cout << "Job is: " << job << endl;
}
void abstr_emp::SetAll()
{
cout << "Enter firstname: ";
getline(cin, fname);
cout << "Enter lastname: ";
getline(cin, lname);
cout << "Enter position: ";
getline(cin, job);
}
ostream&operator<<(ostream&os, const abstr_emp&e)
{
os << e.fname << " " << e.lname << ", " << e.job << endl;
return os;
}
abstr_emp::~abstr_emp()
{
}
employee::employee() :abstr_emp()
{
}
employee::employee(const string &fn, const string &ln,
const string &j) : abstr_emp(fn, ln, j)
{
}
void employee::ShowAll()const
{
abstr_emp::ShowAll();
}
void employee::SetAll()
{
abstr_emp::SetAll();
}
manager::manager() :abstr_emp()
{
}
manager::manager(const string &fn, const string &ln,
const string &j, int ico) : abstr_emp(fn, ln, j), inchargeof(ico)
{
}
manager::manager(const abstr_emp&e, int ico) : abstr_emp(e), inchargeof(ico)
{
}
manager::manager(const manager &m) : abstr_emp(m)
{
}
void manager::ShowAll()const
{
abstr_emp::ShowAll();
cout << "Inchargeof: " << InChargeOf() << endl;
}
void manager::SetAll()
{
abstr_emp::SetAll();
cout << "Enter inchargeof: ";
(cin >> inchargeof).get();
}
fink::fink() :abstr_emp()
{
}
fink::fink(const string &fn, const string &ln,
const string &j, const string &rpo) : abstr_emp(fn, ln, j), reportsto(rpo)
{
}
fink::fink(const abstr_emp&e, const string &rpo) : abstr_emp(e), reportsto(rpo)
{
}
fink::fink(const fink &e) : abstr_emp(e)
{
}
void fink::ShowAll()const
{
abstr_emp::ShowAll();
cout << "Reportsto: " << ReportsTo() << endl;
}
void fink::SetAll()
{
abstr_emp::SetAll();
cout << "Enter reportsto: ";
cin >> reportsto;
}
highfink::highfink() :abstr_emp(), manager(), fink()
{
}
highfink::highfink(const string &fn, const string &ln,
const string &j, const string &rpo, int ico) : abstr_emp(fn, ln, j), manager(fn, ln, j, ico), fink(fn,
ln, j, rpo)
{
}
highfink::highfink(const abstr_emp&e, const string &rpo, int ico) : abstr_emp(e), manager(e, ico),
fink(e, rpo)
{
}
highfink::highfink(const fink &f, int ico) : abstr_emp(f), manager(f, ico), fink(f)
{
}
highfink::highfink(const manager &m, const string &rpo) : abstr_emp(m), manager(m), fink(m,
rpo)
{
}
highfink::highfink(const highfink&h) : abstr_emp(h), manager(h), fink(h)
{
}
void highfink::ShowAll()const
{
abstr_emp::ShowAll();
cout << "InChargeOf: " << manager::InChargeOf() << endl;
cout << "ReportsTo: " << fink::ReportsTo() << endl;
}
void highfink::SetAll()
{
abstr_emp::SetAll();
manager::getInCharge();
fink::getReportsTo();
}
//useemp.cpp
#include "emp.h"
int main(void)
{
employee em("Trip", "Harris", "Thumper");
cout << em << endl;
em.ShowAll();
manager ma("Amorphia", "Spindragon", "Nuancer", 5);
cout << ma << endl;
ma.ShowAll();
fink fi("Matt", "Oggs", "Oiler", "Juno Barr");
cout << fi << endl;
fi.ShowAll();
highfink hf(ma, "Curly Kew");
hf.ShowAll();
cout << "Press a key for next phase:\n";
cin.get();
highfink hf2;
hf2.SetAll();
cout << "Using an abstr_emp * pointer:\n";
abstr_emp *tri[4] = { &em, &fi, &hf, &hf2 };
for (int i = 0; i < 4; i++)
tri[i]->ShowAll();
system("pause");
return 0;
}
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