实验5 继承和多态

实验任务三

源码

 1 #pragma once
 2 #include<iostream>
 3 #include<string>
 4 
 5 using std::string;
 6 using std::cout;
 7 using std::endl;
 8 
 9 //电子宠物类
10 class MachinePets {
11 private:
12     string nickname;
13 public:
14     MachinePets(const string&s="");
15     string get_nickname() const;
16     virtual string talk()=0;
17 };
18 
19 MachinePets::MachinePets(const string& s) :nickname{ s } {
20 
21 }
22 
23 string MachinePets::get_nickname() const {
24     return nickname;
25 }
26 
27 //猫类
28 class PetCats :public MachinePets {
29 public:
30     PetCats(const string& s = "");
31     string talk();
32 };
33 
34 PetCats::PetCats(const string& s) :MachinePets{ s } {
35     
36 }
37 
38 string PetCats::talk() {
39     return "miao wu~";
40 }
41 
42 //狗类
43 class PetDogs :public MachinePets {
44 public:
45     PetDogs(const string& s = "");
46     string talk();
47 };
48 
49 PetDogs::PetDogs(const string& s) :MachinePets{ s } {
50 
51 }
52 
53 string PetDogs::talk() {
54     return "wang wang~";
55 }
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

运行结果

 

 

 

实验任务四

源码

 1 #pragma once
 2 #include<iostream>
 3 #include<string>
 4 #include<iomanip>
 5 
 6 using std::string;
 7 using std::cout;
 8 using std::endl;
 9 using std::setw;
10 
11 class Film {
12 private:
13     string title;
14     string director;
15     string country;
16     int year;
17 public:
18     Film():title(""),director(""),country(""),year(0){}
19     Film(const string&t,const string&d,const string c,const int y)
20         :title(t),director(d),country(c),year(y){}
21 
22     friend std::istream& operator>>(std::istream &is, Film& film);
23     friend std::ostream& operator<<(std::ostream &os, Film& film);
24 
25     int getyear()const;
26 
27 };
28 
29 std::istream& operator>>(std::istream &is, Film& film){
30     cout << "录入片名："; 
31     is >> film.title;
32     cout << "录入导演："; 
33     is >> film.director;
34     cout << "录入制片国家/地区："; 
35     is >> film.country;
36     cout << "录入上映年份："; 
37     is >> film.year; 
38     return is;
39 }
40 
41 std::ostream& operator<<(std::ostream &os, Film& film) {
42     os << std::left;
43     os << setw(15) << film.title
44         << setw(15) << film.director
45         << setw(15) << film.country 
46         << setw(15) << film.year<<endl;
47     return os;
48 }
49 
50 int Film::getyear() const{
51     return year;
52 }
53 
54 bool compare_by_year(const Film& a, const Film& b) {
55     return a.getyear() < b.getyear();
56 }
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

运行结果

 

 

 

实验任务五

源码

 1 #pragma once
 2 
 3 #include <iostream>
 4 
 5 template <typename T>
 6 class Complex {
 7 private:
 8     T real;  // 实部
 9     T imag;  // 虚部
10 
11 public:
12     // 默认构造函数
13     Complex(T r = 0, T i = 0) : real(r), imag(i) {}
14 
15     // 拷贝构造函数
16     Complex(const Complex& other) : real(other.real), imag(other.imag) {}
17 
18     // 获取实部
19     T get_real() const { return real; }
20 
21     // 获取虚部
22     T get_imag() const { return imag; }
23 
24     // 重载+运算符
25     Complex operator+(const Complex& other) const {
26         return Complex(real + other.real, imag + other.imag);
27     }
28 
29     // 重载+=运算符
30     Complex& operator+=(const Complex& other) {
31         real += other.real;
32         imag += other.imag;
33         return *this;
34     }
35 
36     // 重载==运算符
37     bool operator==(const Complex& other) const {
38         return real == other.real && imag == other.imag;
39     }
40 
41     // 重载输入流运算符
42     friend std::istream& operator>>(std::istream& in, Complex& c) {
43         in >> c.real >> c.imag;
44         return in;
45     }
46 
47     // 重载输出流运算符
48     friend std::ostream& operator<<(std::ostream& out, const Complex& c) {
49         out << c.real << (c.imag >= 0 ? " + " : " - ") << std::abs(c.imag) << "i";
50         return out;
51     }
52 };
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

运行结果

 

 

 

实验任务六

源码

 1 #pragma once
 2 
 3 class Date {
 4 private:
 5     int year;
 6     int month;
 7     int day;
 8     int totalDays;
 9 
10 public:
11     Date(int year, int month, int day);
12     int getYear() const { return year; }
13     int getMonth() const { return month; }
14     int getDay() const { return day; }
15     int getMaxDay() const;
16     bool isLeapYear() const {
17         return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
18     }
19     void show() const;
20     int operator-(const Date& date) const {
21         return totalDays - date.totalDays;
22     }
23 };
date.h
 1 #include "date.h"
 2 #include <iostream>
 3 #include <cstdlib>
 4 using namespace std;
 5 
 6 namespace {
 7     const int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
 8 }
 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_BEFORE_MONTH[month - 1] + day;
19     if (isLeapYear() && month > 2) totalDays++;
20 }
21 
22 int Date::getMaxDay() const {
23     if (isLeapYear() && month == 2)
24         return 29;
25     else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
26 }
27 
28 void Date::show() const {
29     cout << getYear() << "-" << getMonth() << "-" << getDay();
30 }
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 
10 public:
11     Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{ 0 } {}
12 
13     double getSum(const Date& date) const {
14         return sum + value * (date - lastDate);
15     }
16 
17     void change(const Date& date, double value) {
18         sum = getSum(date);
19         lastDate = date;
20         this->value = value;
21     }
22 
23     void reset(const Date& date, double value) {
24         lastDate = date;
25         this->value = value;
26         sum = 0;
27     }
28 };
accumulator.h
 1 #pragma once
 2 #include "date.h"
 3 #include "accumulator.h"
 4 #include <string>
 5 using namespace std;
 6 
 7 class Account {
 8 private:
 9     string id;
10     double balance;
11     static double total;
12 protected:
13     Account(const Date& date, const string& id);
14     void record(const Date& date, double amount, const string& desc);
15     void error(const string& msg) const;
16 public:
17     const string& getId() { return id; }
18     double getBalance() const { return balance; }
19     static double getTotal() { return total; }
20     virtual void deposit(const Date& date, double amount, const string& desc) = 0;
21     virtual void withdraw(const Date& date, double amount, const string& desc) = 0;
22     virtual void settle(const Date& date) = 0;
23     virtual void show() const;
24 };
25 
26 class SavingsAccount : public Account {
27 private:
28     Accumulator acc;
29     double rate;
30 public:
31     SavingsAccount(const Date& date, const string& id, double rate);
32     double getRate() const { return rate; }
33     void deposit(const Date& date, double amount, const string& desc);
34     void withdraw(const Date& date, double amount, const string& desc);
35     void settle(const Date& date);
36 };
37 
38 class CreditAccount : public Account {
39 private:
40     Accumulator acc;
41     double credit;
42     double rate;
43     double fee;
44     double getDebt() const {
45         double balance = getBalance();
46         return (balance < 0 ? balance : 0);
47     }
48 public:
49     CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
50     double getCredit() const { return credit; }
51     double getRate() const { return rate; }
52     double getFee() const { return fee; }
53     double getAvailableCredit() const {
54         if (getBalance() < 0) return credit + getBalance();
55         else return credit;
56     }
57     void deposit(const Date& date, double amount, const string& desc);
58     void withdraw(const Date& date, double amount, const string& desc);
59     void settle(const Date& date);
60     void show() const;
61 };
account.h
 1 #include "account.h"
 2 #include <cmath>
 3 #include<iostream>
 4 using namespace std;
 5 
 6 double Account::total = 0;
 7 
 8 Account::Account(const Date& date, const string& id) : id(id), balance(0) {
 9     date.show();
10     cout << "\t#" << id << " created" << endl;
11 }
12 
13 void Account::record(const Date& date, double amount, const string& desc) {
14     amount = floor(amount * 100 + 0.5) / 100;
15     balance += amount;
16     total += amount;
17     date.show();
18     cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
19 }
20 
21 void Account::show() const {
22     cout << id << "\tBalance: " << balance;
23 }
24 
25 void Account::error(const string& msg) const {
26     cout << "Error (#" << id << "): " << msg << endl;
27 }
28 
29 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate)
30     : 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) record(date, interest, "interest");
50     acc.reset(date, getBalance());
51 }
52 
53 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
54     : 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 enough 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) record(date, interest, "interest");
74     if (date.getMonth() == 1) record(date, -fee, "annual fee");
75     acc.reset(date, getDebt());
76 }
77 
78 void CreditAccount::show() const {
79     Account::show();
80     cout << "\tAvailable credit: " << getAvailableCredit();
81 }
account.cpp
 1 #include "account.h"
 2 #include<iostream>
 3 using namespace std;
 4 
 5 int main() {
 6     Date date(2008, 11, 1);
 7     SavingsAccount sa1(date, "S3755217", 0.015);
 8     SavingsAccount sa2(date, "02342342", 0.015);
 9     CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
10     Account* accounts[] = { &sa1, &sa2, &ca };
11     const int n = sizeof(accounts) / sizeof(Account*);
12     cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
13     char cmd;
14     do {
15         date.show();
16         cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
17         int index, day;
18         double amount;
19         string desc;
20         cin >> cmd;
21         switch (cmd) {
22         case 'd':
23             cin >> index >> amount;
24             getline(cin, desc);
25             accounts[index]->deposit(date, amount, desc);
26             break;
27         case 'w':
28             cin >> index >> amount;
29             getline(cin, desc);
30             accounts[index]->withdraw(date, amount, desc);
31             break;
32         case 's':
33             for (int i = 0; i < n; i++) {
34                 cout << "[" << i << "]";
35                 accounts[i]->show();
36                 cout << endl;
37             }
38             break;
39         case 'c':
40             cin >> day;
41             if (day < date.getDay()) {
42                 cout << "You cannot specify a previous day";
43             }
44             else if (day > date.getMaxDay())
45                 cout << "Invalid day";
46             else date = Date(date.getYear(), date.getMonth(), day);
47             break;
48         case 'n':
49             if (date.getMonth() == 12)
50                 date = Date(date.getYear() + 1, 1, 1);
51             else date = Date(date.getYear(), date.getMonth() + 1, 1);
52             for (int i = 0; i < n; i++) {
53                 accounts[i]->settle(date);
54             }
55             break;
56         }
57     } while (cmd != 'e');
58     return 0;
59 }
task6.cpp

运行结果

 

posted @ 2024-12-02 19:59  姚润勰  阅读(26)  评论(0)  编辑  收藏  举报