实验5

实验任务3：

实验代码：

pets.hpp:

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

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task3.cpp:

 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 }

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实验截图：

实验任务4：

实验代码：

film.hpp:

 1 #pragma once
 2 
 3 #include <iostream>
 4 #include <string>
 5 #include <iomanip>
 6 
 7 using namespace std;
 8 
 9 class Film {
10 public:
11     Film(const string &name = " ", const string &director = " ", const string &region = " ", const string &year = " ");
12     string get_year() const;
13     friend ostream& operator<<(ostream &out, const Film &film);
14     friend istream& operator>>(ostream &in, Film &film);
15 public:
16     string name;
17     string director;
18     string region;
19     string year;
20 };
21 
22 Film::Film(const string &name, const string &director, const string &region, const string &year) {
23     this->name = name;
24     this->director = director;
25     this->region = region;
26     this->year = year;
27 }
28 
29 string Film::get_year() const {
30     return year;
31 } 
32 
33 ostream& operator<<(ostream &out, const Film &film) {
34     out << left;
35     out << setw(15) << "片名:" << film.name << endl
36         << setw(15) << "导演:" << film.director << endl
37         << setw(15) << "地区:" << film.region << endl
38         << setw(15) << "年份:" << film.year << endl; 
39 
40     return out;
41 }
42 
43 istream& operator>>(istream &in, Film &film) {
44     cout << "录入片名:";
45     in >> film.name;
46     cout << "录入导演:";
47     in >> film.director;
48     cout << "录入制片国家/地区:";
49     in >> film.region;
50     cout << "录入上映年份:";
51     in >> film.year;
52     return in;
53 }

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task4.cpp:

 1 #pragma once
 2 
 3 #include <iostream>
 4 #include <string>
 5 #include <iomanip>
 6 
 7 using namespace std;
 8 
 9 class Film {
10 public:
11     Film(const string &name = " ", const string &director = " ", const string &region = " ", const string &year = " ");
12     string get_year() const;
13     friend ostream& operator<<(ostream &out, const Film &film);
14     friend istream& operator>>(ostream &in, Film &film);
15 public:
16     string name;
17     string director;
18     string region;
19     string year;
20 };
21 
22 Film::Film(const string &name, const string &director, const string &region, const string &year) {
23     this->name = name;
24     this->director = director;
25     this->region = region;
26     this->year = year;
27 }
28 
29 string Film::get_year() const {
30     return year;
31 } 
32 
33 ostream& operator<<(ostream &out, const Film &film) {
34     out << left;
35     out << setw(15) << "片名:" << film.name << endl
36         << setw(15) << "导演:" << film.director << endl
37         << setw(15) << "地区:" << film.region << endl
38         << setw(15) << "年份:" << film.year << endl; 
39 
40     return out;
41 }
42 
43 istream& operator>>(istream &in, Film &film) {
44     cout << "录入片名:";
45     in >> film.name;
46     cout << "录入导演:";
47     in >> film.director;
48     cout << "录入制片国家/地区:";
49     in >> film.region;
50     cout << "录入上映年份:";
51     in >> film.year;
52     return in;
53 }

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实验截图：

实验任务5：

实验代码：

Complex.hpp:

 1 #pragma once
 2 
 3 #include <iostream>
 4 using namespace std;
 5 
 6 template <typename T>
 7 class Complex {
 8 public:
 9     Complex(const T& r = 0, const T& i = 0): real{r}, imag{i} {}
10     Complex operator+=(const Complex& c) {
11         real += c.real;
12         imag += c.imag;
13         return *this;
14     }
15     friend Complex operator+(const Complex& c1, const Complex& c2) {
16         return Complex<T>(c1.real + c2.real, c1.imag + c2.imag);
17     }
18     friend bool operator==(const Complex& c1, const Complex& c2) {
19         return c1.real == c2.real && c1.imag == c2.imag;
20     }
21     friend ostream& operator<<(ostream& out, const Complex& c) {
22         if(c.imag >= 0)
23             out << c.real << " + " << c.imag << "i";
24         else
25             out << c.real << " - " << -c.imag << "i";
26         return out;
27     }
28     friend istream& operator>>(istream& in, Complex& c) {
29         in >> c.real >> c.imag;
30         return in;
31     }
32     T get_real() const {
33         return real;
34     } 
35     T get_imag() const {
36         return imag;
37     }
38 private:
39     T real;
40     T imag;
41 };

View Code

task5.cpp:

 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 }

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实验截图：

实验任务6：

实验代码：

date.hpp:

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

View Code

date.cpp:

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

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accumulator.hpp:

 1 #include "date.hpp"
 2 class Accumulator {
 3 private:
 4     Date lastDate;
 5     double value;
 6     double sum;
 7 public:
 8     double getSum(const Date &date) const {
 9         return sum+value*(date-lastDate);
10     }
11 }

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account.hpp:

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

View Code

account.cpp:

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

View Code

task6.cpp:

 1 #include"account.hpp"
 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 
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 
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             else date = Date(date.getYear(), date.getMonth(), day);
48             break;
49         case 'n':
50             if (date.getMonth() == 12)
51                 date = Date(date.getYear() + 1, 1, 1);
52             else date = Date(date.getYear(), date.getMonth() + 1, 1);
53             for (int i = 0; i < n; i++) {
54                 accounts[i]->settle(date);
55             }
56             break;
57         }
58     } while (cmd != 'e');
59     return 0;
60 }

View Code

实验截图：

改进：在基类Account中将账户的公共操作皆声明为虚函数，因此可以通过基类的指针来执行各种操作，因而各种类型的账户对象都可以通过一个基类指针的数组访问，使得可以通过同意的方式来操作各个账户，从cin输入所需执行的操作变得非常方便。

不足：将几个账户的构造在程序中写死了，不允许用户随时动态添加新的账户。

发表于 2024-12-03 15:45 摇摇兔坦碎冰冰阅读(1) 评论(0) 编辑收藏举报

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