实验五

Task3:

 1 #ifndef PETS_HPP
 2 #define PETS_HPP
 3 
 4 #include <string>
 5 
 6 class MachinePets {
 7 private:
 8     std::string nickname;
 9 
10 public:
11     MachinePets(const std::string s);
12     virtual std::string talk() = 0;
13     std::string get_nickname() const { return nickname; }
14 };
15 
16 class PetCats : public MachinePets {
17 public:
18     PetCats(const std::string &s);
19     std::string talk() override;
20 };
21 
22 class PetDogs : public MachinePets {
23 public:
24     PetDogs(const std::string &s);
25     std::string talk() override;
26 };
27 
28 #endif
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

 

Task4:

 1 #ifndef FILM_HPP
 2 #define FILM_HPP
 3 
 4 #include <iostream>
 5 #include <string>
 6 class Film {
 7 private:
 8     std::string title;       // 片名
 9     std::string director;    // 导演
10     std::string country;     // 制片国家/地区
11     int year;                // 上映年份
12 public:
13     // 构造函数
14     Film() = default;
15 
16     // 重载输入运算符>>
17     friend std::istream& operator>>(std::istream& is, Film& f);
18 
19     // 重载输出运算符<<
20     friend std::ostream& operator<<(std::ostream& os, const Film& f);
21 
22     // 获取上映年份，用于排序
23     int getYear() const { return year; }
24 };
25 std::istream& operator>>(std::istream& is, Film& f) {
26     std::cout << "输入片名: ";
27     is >> f.title;
28     std::cout << "输入导演: ";
29     is >> f.director;
30     std::cout << "输入制片国家/地区: ";
31     is >> f.country;
32     std::cout << "输入上映年份: ";
33     is >> f.year;
34     return is;
35 }
36 std::ostream& operator<<(std::ostream& os, const Film& f) {
37     os << "片名: " << f.title << std::endl;
38     os << "导演: " << f.director << std::endl;
39     os << "制片国家/地区: " << f.country << std::endl;
40     os << "上映年份: " << f.year << std::endl;
41     return os;
42 }
43 bool compare_by_year(const Film& a, const Film& b) {
44     return a.getYear() < b.getYear();
45 }
46 #endif
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

 

 

Task5:

 1 #ifndef COMPLEX_HPP
 2 #define COMPLEX_HPP
 3 
 4 #include <iostream>
 5 #include <sstream>
 6 #include <string>
 7 template <typename T>
 8 class Complex {
 9 private:
10     T real;    // 实部
11     T imag;    // 虚部
12 public:
13     // 构造函数
14     Complex(T r = 0, T i = 0) : real(r), imag(i) {}
15 
16     // 获取实部
17     T get_real() const { return real; }
18 
19     // 获取虚部
20     T get_imag() const { return imag; }
21 
22     // 重载 += 运算符
23     Complex<T>& operator+=(const Complex<T>& other) {
24         real += other.real;
25         imag += other.imag;
26         return *this;
27     }
28 
29     // 重载 + 运算符
30     Complex<T> operator+(const Complex<T>& other) const {
31         return Complex<T>(real + other.real, imag + other.imag);
32     }
33 
34     // 重载 == 运算符
35     bool operator==(const Complex<T>& other) const {
36         return (real == other.real) && (imag == other.imag);
37     }
38 };
39 template <typename T>
40 std::istream& operator>>(std::istream& is, Complex<T>& c) {
41     std::string line;
42     std::getline(is, line);
43     std::stringstream ss(line);
44     char plus_or_minus;
45     T real, imag;
46     ss >> real;
47     if (ss.peek() == '+' || ss.peek() == '-') {
48         ss >> plus_or_minus;
49         ss >> imag;
50         if (plus_or_minus == '-') {
51             imag = -imag;
52         }
53     } else {
54         imag = 0;
55     }
56     c = Complex<T>(real, imag);
57     return is;
58 }
59 template <typename T>
60 std::ostream& operator<<(std::ostream& os, const Complex<T>& c) {
61     if (c.get_imag() >= 0) {
62         os << c.get_real() << "+" << c.get_imag() << "i";
63     } else {
64         os << c.get_real() << c.get_imag() << "i";
65     }
66     return os;
67 }
68 #endif
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

 

 

Task6:

 1 #ifndef __DATE_H__
 2 #define __DATE_H__
 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 };
24 #endif
date.h
 1 #include "date.h"
 2 #include <iostream>
 3 #include <cstdlib>
 4 using namespace std;
 5 
 6 //命名空间使下面的定义只在当前文件中有效
 7 namespace {
 8     //存储平年中的某个月1日之前有多少天，为便于getMaxDay函数的实现，该数组多出一项
 9     const int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
10 }
11 
12 Date::Date(int year, int month, int day) : year(year), month(month), day(day) {
13     if (day <= 0 || day > getMaxDay()) {
14         cout << "Invalid date.";
15         show();
16         cout << endl;
17         exit(1);
18     }
19     int years = year - 1;
20     totalDays = years * 365 + years / 4 - years / 100 + years / 400
21         + DAYS_BEFORE_MONTH[month - 1] + day;
22     if (isLeapYear() && month > 2) totalDays++;
23 }
24 
25 
26 int Date::getMaxDay()const {
27     if (isLeapYear() && month == 2) {
28         return 29;
29     }
30     else {
31         return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
32     }
33 }
34 
35 void Date::show() const {
36     cout << getYear() << '-' << getMonth() << '-' << getDay();
37 }
date.cpp
 1 #ifndef __ACCUMULATOR_H__
 2 #define __ACCUMULATOR_H__
 3 #include "date.h"
 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 = value;
22         sum = 0;
23     }
24 };
25 #endif
accumulator.h
 1 #ifndef __ACCOUNT_H__
 2 #define __ACCOUNT_H__
 3 #include "date.h"
 4 #include "accumulator.h"
 5 #include <string>
 6 
 7 class Account {
 8 private:
 9     std::string id;
10     double balance;
11     static double total;
12 protected:
13     Account(const Date& date, const std::string& id);
14     void record(const Date& date, double amount, const std::string& desc);
15     void error(const std::string& msg) const;
16 public:
17     const std::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 std::string& desc) = 0;
21     virtual void withdraw(const Date& date, double amount, const std::string& desc) = 0;
22     virtual void settle(const Date& date) = 0;
23     virtual void show() const;
24 };
25 using namespace std;
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 };
62 #endif
acount.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     if (date.getMonth() == 1) {
49         double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
50         if (interest != 0) record(date, interest, "interest");
51         acc.reset(date, getBalance());
52     }
53 }
54 
55 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
56     : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {}
57 
58 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
59     record(date, amount, desc);
60     acc.change(date, getDebt());
61 }
62 
63 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
64     if (amount - getBalance() > credit) {
65         error("not enough credit");
66     }
67     else {
68         record(date, -amount, desc);
69         acc.change(date, getDebt());
70     }
71 }
72 
73 void CreditAccount::settle(const Date& date) {
74     double interest = acc.getSum(date) * rate;
75     if (interest != 0) record(date, interest, "interest");
76     if (date.getMonth() == 1) 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 using namespace std;
 4 int main() {
 5     Date date(2008, 11, 1);
 6     SavingsAccount sa1(date, "S3755217", 0.015);
 7     SavingsAccount sa2(date, "02342342", 0.015);
 8     CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
 9     Account* accounts[] = { &sa1, &sa2, &ca };
10     const int n = sizeof(accounts) / sizeof(Account*);
11     cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
12     char cmd;
13     do {
14         date.show();
15         cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
16         int index, day;
17         double amount;
18         string desc;
19         cin >> cmd;
20         switch (cmd) {
21         case 'd':
22             cin >> index >> amount;
23             getline(cin, desc);
24             accounts[index]->deposit(date, amount, desc);
25             break;
26         case 'w':
27             cin >> index >> amount;
28             getline(cin, desc);
29             accounts[index]->withdraw(date, amount, desc);
30             break;
31         case 's':
32             for (int i = 0; i < n; i++) {
33                 cout << "[" << i << "]";
34                 accounts[i]->show();
35                 cout << endl;
36             }
37             break;
38         case 'c':
39             cin >> day;
40             if (day < date.getDay()) {
41                 cout << "You cannot specify a previous day";
42             }
43             else if (day > date.getMaxDay())
44                 cout << "Invalid day";
45             else date = Date(date.getYear(), date.getMonth(), day);
46             break;
47         case 'n':
48             if (date.getMonth() == 12)
49                 date = Date(date.getYear() + 1, 1, 1);
50             else date = Date(date.getYear(), date.getMonth() + 1, 1);
51             for (int i = 0; i < n; i++) {
52                 accounts[i]->settle(date);
53             }
54             break;
55         }
56     } while (cmd != 'e');
57     return 0;
58 }
8.8

 

posted @ 2024-12-06 16:33  瑞思白  阅读(5)  评论(0)  编辑  收藏  举报