实验5 继承和多态

task 3:

#include <iostream>
#include <vector>

using namespace std;


class MachinePets
{
public:
    MachinePets(const string s):nickname{s}{}    
    virtual string talk()=0;
    string get_nickname()
    {
        return nickname;
    }
private:
    string nickname;
};

class PetCats:public MachinePets
{
public:
    PetCats(const string &s):MachinePets{s},nickname{s}{}    
    string talk()override;
private:
    string nickname;
};
string PetCats::talk()
{
    return "mio!";
}


class PetDogs:public MachinePets
{
public:
    PetDogs(const string &s):MachinePets{s},nickname{s}{}    
    string talk()override;
private:
    string nickname;
};
string PetDogs::talk()
{
    return "woof!";
}

pets.hpp

 1 #include <iostream>
 2 #include <vector>
 3 #include "pets.hpp"
 4 
 5 void test() {
 6     using namespace std;
 7 
 8     vector<MachinePets *> pets;
 9 
10     pets.push_back(new PetCats("miku"));
11     pets.push_back(new PetDogs("da huang"));
12 
13     for(auto &ptr: pets)
14         cout <<ptr->get_nickname() << " says " << ptr->talk() << endl;
15 }
16 
17 int main() {
18     test();
19 }

task3.cpp

task 4:

 1 #include <iostream>
 2 #include <string>
 3 #include <vector>
 4 #include <algorithm>
 5 #include <iomanip>
 6 
 7 using namespace std;
 8 using std::setw;
 9 
10 class Film
11 {
12 public:
13     Film()
14     {
15         pyear = -9999;
16     }
17     int get()
18     {
19         return pyear;
20     }
21     friend istream& operator>>(istream& in,Film& f)
22     {
23         cout << "片名:";
24         in >> f.name;
25         cout << "导演:";
26         in >> f.director;
27         cout << "制片国家/地区:";
28         in >> f.parea;
29         cout << "上映年份:";
30         in >> f.pyear;
31         return in;
32     }
33     friend ostream& operator<<(ostream& out, Film f)
34     {
35         out << left;
36         out << setw(10) << f.name;
37         out << setw(10) << f.director;
38         out << setw(10) << f.parea;
39         out << setw(10) << f.pyear;
40         return out;
41     }
42 private:
43     string name, director, parea;
44     int pyear;
45 
46 };
47 
48 bool compare_by_year(Film& a, Film& b)
49 {
50     return a.get() < b.get();
51 }

film.hpp

 1 #include "film.hpp"
 2 #include <iostream>
 3 #include <string>
 4 #include <vector>
 5 #include <algorithm>
 6 
 7 void test() {
 8     using namespace std;
 9     
10     int n;
11     cout << "输入电影数目: ";
12     cin >> n;
13 
14     cout << "录入" << n << "部影片信息" << endl;
15     vector<Film> film_lst;
16     for(int i = 0; i < n; ++i) {
17         Film f;
18         cout << string(20, '-') << "第" << i+1 << "部影片录入" << string(20, '-') << endl;
19         cin >> f;
20         film_lst.push_back(f);
21     }
22 
23     // 按发行年份升序排序
24     sort(film_lst.begin(), film_lst.end(), compare_by_year);
25 
26     cout << string(20, '=') + "电影信息(按发行年份)" +  string(20, '=')<< endl;
27     for(auto &f: film_lst)
28         cout << f << endl;
29 }
30 
31 int main() {
32     test();
33 }

task4.cpp

task 5:

 1 #include <iostream>
 2 
 3 
 4 using std::cin;
 5 using std::cout;
 6 using std::endl;
 7 using std::boolalpha;
 8 using std::ostream;
 9 using std::istream;
10 
11 
12 template <typename elem>
13 class Complex
14 {
15 public:
16     Complex(elem r=0, elem i=0) :real{ r }, imag{ i }{}
17     elem get_real() {
18         return real;
19     }
20     elem get_imag() {
21         return imag;
22     }
23     Complex(const Complex<elem>& t) {
24         this->real = t.real;
25         this->imag = t.imag;
26     }
27     void operator+=(const Complex<elem>& b)
28     {
29         real += b.real;
30         imag += b.imag;
31     }
32     bool operator==(const Complex<elem>& b)const
33     {
34         return real == b.real && imag == b.imag;
35     }
36     template <typename elem0>
37     friend Complex<elem0> operator+(const Complex<elem0>& a, const Complex<elem0>& b);
38     template <typename elem1>
39     friend istream& operator>>(istream& in, Complex<elem1>& f);
40     template <typename elem2>
41     friend ostream& operator<<(ostream& out, const Complex<elem2>& f);
42 
43 private:
44     elem imag, real;
45 };
46 template <typename elem0>
47 Complex<elem0> operator+(const Complex<elem0>& a, const Complex<elem0>& b)
48 {
49     return Complex<elem0>(a.real + b.real, a.imag + b.imag);
50 }
51 template <typename elem1>
52 ostream& operator<<(ostream& out, const Complex<elem1>& f)
53 {
54     if (f.imag >= 0)out << f.real << " + " << f.imag << "i";
55     else out << f.real << " - " << -1 * f.imag << "i";
56     return out;
57 }
58 template <typename elem2>
59 istream& operator>>(istream& in, Complex<elem2>& f)
60 {
61     in >> f.real;
62     in >> f.imag;
63     return in;
64 }

Complex.hpp

 1 #include "Complex.hpp"
 2 #include <iostream>
 3 
 4 using std::cin;
 5 using std::cout;
 6 using std::endl;
 7 using std::boolalpha;
 8 
 9 void test1() {
10     Complex<int> c1(2, -5), c2(c1);
11 
12     cout << "c1 = " << c1 << endl;
13     cout << "c2 = " << c2 << endl;
14     cout << "c1 + c2 = " << c1 + c2 << endl;
15     
16     c1 += c2;
17     cout << "c1 = " << c1 << endl;
18     cout << boolalpha << (c1 == c2) << endl;
19 }
20 
21 void test2() {
22     Complex<double> c1, c2;
23     cout << "Enter c1 and c2: ";
24     cin >> c1 >> c2;
25     cout << "c1 = " << c1 << endl;
26     cout << "c2 = " << c2 << endl;
27 
28     cout << "c1.real = " << c1.get_real() << endl;
29     cout << "c1.imag = " << c1.get_imag() << endl;
30 }
31 
32 int main() {
33     cout << "自定义类模板Complex测试1: " << endl;
34     test1();
35 
36     cout << endl;
37 
38     cout << "自定义类模板Complex测试2: " << endl;
39     test2();
40 }

task5.cpp

task 6:

 1 #pragma once
 2 class Date {
 3  private:
 4          int year;
 5          int month;
 6          int day;
 7          int totalDays;
 8  public:
 9          Date(int year, int month, int day);
10          int getYear()const {
11              return year;
12          }
13          int getMonth()const {
14              return month;
15          }
16          int getDay()const {
17              return day;
18          }
19          int getMaxDay()const;
20          bool isLeapYear()const {
21              return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
22          }
23          void show()const;
24          int operator-(const Date& date)const {
25              return totalDays - date.totalDays;
26          }
27  };

date.h

 1 #include"date.h"
 2 #include<iostream>
 3 #include<cstdlib>
 4  
 5  using namespace std;
 6   
 7  namespace {
 8      const int DAYS_BEFIRE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304 ,334,365 };
 9  }
10  Date::Date(int year, int month, int day) :year(year), month(month), day(day) {
11      if (day <= 0 || day > getMaxDay()) {
12          cout << "Invalid date: ";
13          show();
14          cout << endl;
15          exit(1);
16      }
17      int years = year - 1;
18      totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFIRE_MONTH[month - 1] + day;
19      if (isLeapYear() && month > 2) totalDays++;
20  }
21  int Date::getMaxDay()const {
22      if (isLeapYear() && month == 2)
23          return 29;
24      else return DAYS_BEFIRE_MONTH[month] - DAYS_BEFIRE_MONTH[month - 1];
25  }
26  void Date::show()const {
27      cout << getYear() << "-" << getMonth() << "-" << getDay();
28  }

date.cpp

 1 #pragma once 
 2 #include"date.h"
 3 
 4 class Accumulator {
 5 private:
 6     Date lastDate;
 7     double value;
 8     double sum;
 9 public:
10     Accumulator(const Date& date, double value) :lastDate(date), value(value), sum { 0 } {}
11     double getSum(const Date& date) const {
12         return sum + value * (date - lastDate);
13     }
14     void change(const Date& date, double value) {
15         sum = getSum(date);
16         lastDate = date;
17         this->value = value;
18     }
19     void reset(const Date& date, double value) {
20         lastDate = date;
21         this->value;
22         sum = 0;
23     }
24 };

accumulator.h

 1 #pragma once 
 2 #include"date.h"
 3 #include"accumulator.h"
 4 #include<string>
 5  
 6 using namespace std;
 7 
 8 class Account {
 9 private:
10     string id;
11     double balance;
12     static double total;
13 protected:
14     Account(const Date& date, const string& id);
15     void record(const Date& date, double amoount, const string& desc);
16     void error(const string& msg) const;
17 public:
18     const string& getId() {
19         return id;
20     }
21     double getBalance()const {
22         return balance;
23     }
24     static double getTotal() {
25         return total;
26     }
27     virtual void deposit(const Date& date, double amount, const string& desc) = 0;
28     virtual void withdraw(const Date& date, double amount, const string& desc) = 0;
29     virtual void settle(const Date& date) = 0;
30     virtual void show()const;
31 };
32 class SavingsAccount :public Account {
33 private:
34     Accumulator acc;
35     double rate;
36 public:
37     SavingsAccount(const Date& date, const string& id, double rate);
38     double getRate() const {
39         return  rate;
40     }
41     void deposit(const Date& date, double amount, const string& desc);
42     void withdraw(const Date& date, double amount, const string& desc);
43     void settle(const Date& date);
44 };
45 class CreditAccount :public Account {
46 private:
47     Accumulator acc;
48     double credit;
49     double rate;
50     double fee;
51     double getDebt()const {
52         double balance = getBalance();
53         return(balance < 0 ? balance : 0);
54     }
55 public:
56     CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
57     double getCredit()const {
58         return credit;
59     }
60     double getRate()const {
61         return rate;
62     }
63     double getFee() const {
64         return fee;
65     }
66     double getAvailableCredit()const {
67         if (getBalance() < 0)return credit + getBalance();
68         else return credit;
69     }
70     void deposit(const Date& date, double amount, const string& desc);
71     void withdraw(const Date& date, double amount, const string& desc);
72     void settle(const Date& date);
73     void show()const;
74 };

account.h

 1 #include "account.h"
 2 #include <cmath>
 3 #include <iostream>
 4 
 5 using namespace std;
 6 
 7 double Account::total = 0;
 8 
 9 Account::Account(const Date& date, const string& id) : id(id), balance(0) {
10     date.show();
11     cout << "\t#" << id << " created" << endl;
12 }
13 
14 void Account::record(const Date& date, double amount, const string& desc) {
15     amount = floor(amount * 100 + 0.5) / 100;
16     balance += amount;
17     total += amount;
18     date.show();
19     cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
20 }
21 
22 void Account::show() const {
23     cout << id << "\tBalance: " << balance;
24 }
25 
26 void Account::error(const string& msg) const {
27     cout << "Error(#" << id << "): " << msg << endl;
28 }
29 
30 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) : Account(date, id), rate(rate), acc(date, 0) {}
31 
32 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
33     record(date, amount, desc);
34     acc.change(date, getBalance());
35 }
36 
37 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
38     if (amount > getBalance()) {
39         error("not enough money");
40     }
41     else {
42         record(date, -amount, desc);
43         acc.change(date, getBalance());
44     }
45 }
46 
47 void SavingsAccount::settle(const Date& date) {
48     double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
49     if (interest != 0)
50         record(date, interest, "interest");
51     acc.reset(date, getBalance());
52 }
53 
54 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee) : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {}
55 
56 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
57     record(date, amount, desc);
58     acc.change(date, getDebt());
59 }
60 
61 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
62     if (amount - getBalance() > credit) {
63         error("not enouogh credit");
64     }
65     else {
66         record(date, -amount, desc);
67         acc.change(date, getDebt());
68     }
69 }
70 
71 void CreditAccount::settle(const Date& date) {
72     double interest = acc.getSum(date) * rate;
73     if (interest != 0)
74         record(date, interest, "interest");
75     if (date.getMonth() == 1)
76         record(date, -fee, "annual fee");
77     acc.reset(date, getDebt());
78 }
79 
80 void CreditAccount::show() const {
81     Account::show();
82     cout << "\tAvailable credit: " << getAvailableCredit();
83 }

account.cpp

 1 #include "account.h"
 2 #include <iostream>
 3 
 4 using namespace std;
 5 
 6 int main() {
 7     Date date(2008, 11, 1);
 8     SavingsAccount sa1(date, "S3755217", 0.015);
 9     SavingsAccount sa2(date, "02342342", 0.015);
10     CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
11     Account* accounts[] = { &sa1, &sa2, &ca };
12     const int n = sizeof(accounts) / sizeof(Account*);
13     cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
14     char cmd;
15     do {
16         date.show();
17         cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
18         int index, day;
19         double amount;
20         string desc;
21         cin >> cmd;
22         switch (cmd) {
23         case 'd':
24             cin >> index >> amount;
25             getline(cin, desc);
26             accounts[index]->deposit(date, amount, desc);
27             break;
28         case 'w':
29             cin >> index >> amount;
30             getline(cin, desc);
31             accounts[index]->withdraw(date, amount, desc);
32             break;
33         case 's':
34             for (int i = 0; i < n; i++) {
35                 cout << "[" << i << "]";
36                 accounts[i]->show();
37                 cout << endl;
38             }
39             break;
40         case 'c':
41             cin >> day;
42             if (day < date.getDay()) {
43                 cout << "You cannot specify a previous day";
44             }
45             else if (day > date.getMaxDay()) {
46                 cout << "Invalid day";
47             }
48             else {
49                 date = Date(date.getYear(), date.getMonth(), day);
50             }
51             break;
52         case 'n':
53             if (date.getMonth() == 12) {
54                 date = Date(date.getYear() + 1, 1, 1);
55             }
56             else {
57                 date = Date(date.getYear(), date.getMonth() + 1, 1);
58             }
59             for (int i = 0; i < n; i++) {
60                 accounts[i]->settle(date);
61             }
62             break;
63         }
64     } while (cmd != 'e');
65     return 0;
66 }

8_8.cpp

posted @ 2024-12-03 16:41 存在者阅读(1) 评论(0) 编辑收藏举报

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实验5 继承和多态

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