实验5 继承和多态

实验任务3

代码

pets.hpp

 1 #pragma once
 2 #include <iostream>
 3 #include <string>
 4 using namespace std;
 5 
 6 class MachinePets {
 7 public:
 8     MachinePets(const string &nickname) : nickname(nickname) {}
 9     virtual ~MachinePets() = default;
10     string get_nickname() const { return nickname; }
11     virtual string talk() const = 0; 
12 private:
13     string nickname;
14 };
15 
16 class PetCats : public MachinePets {
17 public:
18     PetCats(const string &nickname) : MachinePets(nickname) {}
19     string talk() const override { return "miao wu~"; }
20 };
21 
22 class PetDogs : public MachinePets {
23 public:
24     PetDogs(const string &nickname) : MachinePets(nickname) {}
25     string talk() const override { return "wang wang~"; }
26 };

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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实验任务4

代码

film.hpp

 

 1 #pragma once
 2 #include<iostream>
 3 #include<string>
 4 #include<iomanip>
 5 using namespace std;
 6 
 7 class Film
 8 {
 9 private:
10     string pianming;
11     string daoyan;
12     string diqu;
13     int  nianfen;
14 
15 public:
16     friend istream& operator>>(istream& in, Film& f);
17     friend ostream& operator<<(ostream& out, const Film& f);
18     friend bool compare_by_year(const Film& f1, const Film& f2);
19 
20 };
21 
22 istream& operator>>(istream &in,Film& f)
23 {
24     cout << "录入片名:"; cin >> f.pianming;
25     cout << "录入导演:"; cin >> f.daoyan;
26     cout << "录入制片国家/地区:"; cin >> f.diqu;
27     cout << "录入上映年份:"; cin >> f.nianfen;
28     return in;
29 
30 }
31 
32 ostream& operator<<(ostream& out, const Film& f)
33 {
34     out << left;
35     out << setw(15) << f.pianming << setw(15) << f.daoyan << setw(15) << f.diqu << setw(15) << f.nianfen;
36     return out;
37 }
38 
39 
40 bool compare_by_year(const Film& f1, const Film& f2)
41 {
42     return f1.nianfen < f2.nianfen;
43 }

task4.cpp

#include "film.hpp"
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

void test() {
    using namespace std;
    
    int n;
    cout << "输入电影数目: ";
    cin >> n;

    cout << "录入" << n << "部影片信息" << endl;
    vector<Film> film_lst;
    for(int i = 0; i < n; ++i) {
        Film f;
        cout << string(20, '-') << "第" << i+1 << "部影片录入" << string(20, '-') << endl;
        cin >> f;
        film_lst.push_back(f);
    }

    // 按发行年份升序排序
    sort(film_lst.begin(), film_lst.end(), compare_by_year);

    cout << string(20, '=') + "电影信息(按发行年份)" +  string(20, '=')<< endl;
    for(auto &f: film_lst)
        cout << f << endl;
}

int main() {
    test();
}

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实验任务5

代码

Complex.hpp

 1 #pragma once
 2 #include <iostream>
 3 using namespace std;
 4 
 5 template <typename T>
 6 class Complex {
 7 public:
 8     Complex(T real = 0, T imag = 0) : real(real), imag(imag) {}
 9 
10     T get_real() const { return real; }
11     T get_imag() const { return imag; }
12 
13     Complex &operator+=(const Complex &rhs) {
14         real += rhs.real;
15         imag += rhs.imag;
16         return *this;
17     }
18 
19     friend Complex operator+(const Complex &lhs, const Complex &rhs) {
20         return Complex(lhs.real + rhs.real, lhs.imag + rhs.imag);
21     }
22 
23     friend bool operator==(const Complex &lhs, const Complex &rhs) {
24         return lhs.real == rhs.real && lhs.imag == rhs.imag;
25     }
26 
27     friend istream &operator>>(istream &in, Complex &c) {
28         cout << "实部: ";
29         in >> c.real;
30         cout << "虚部: ";
31         in >> c.imag;
32         return in;
33     }
34 
35     friend ostream &operator<<(ostream &out, const Complex &c) {
36         out << c.real << " + " << c.imag << "i";
37         return out;
38     }
39 
40 private:
41     T real;
42     T imag;
43 };

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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实验任务6

代码

date.h

 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     }
20          void show() const;
21         int operator-(const Date & date) const {
22                 return totalDays - date.totalDays;
23  
24     }
25  
26 };

date.cpp

 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  
11 Date::Date(int year, int month, int day) : year(year), month(month), day(day) {
12     if (day <= 0 || day > getMaxDay()) {
13         cout << "Invalid date: ";
14         show();
15         cout << endl;
16         exit(1);
17  
18     }
19     int years = year - 1;
20     totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
21     if (isLeapYear() && month > 2) totalDays++;
22  
23 }
24  
25 int Date::getMaxDay() const {
26     if (isLeapYear() && month == 2)
27         return 29;
28     else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
29  
30 }
31  
32 void Date::show() const {
33     cout << getYear() << "-" << getMonth() << "-" << getDay();
34  
35 }

accumulator.h

 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  
12     double getSum(const Date& date) const {
13         return sum + value * (date - lastDate);
14  
15     }
16     Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{ 0 } {}
17  
18     void change(const Date& date, double value) {
19         sum = getSum(date);
20         lastDate = date;
21         this->value = value;
22  
23     }
24  
25     void reset(const Date& date, double value) {
26         lastDate = date;
27         this->value = value;
28         sum = 0;
29     }
30  
31 };

account.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  
17 public:
18     const string& getId() { return id; }
19     double getBalance() const { return balance; }
20     static double getTotal() { return total; }
21     virtual void deposit(const Date& date, double amount, const string& desc) = 0;
22     virtual void withdraw(const Date& date, double amount, const string& desc) = 0;
23     virtual void settle(const Date& date) = 0;
24     virtual void show() const;
25  
26 };
27  
28 class SavingsAccount : public Account {
29 private:
30     Accumulator acc;
31     double rate;
32 public:
33     SavingsAccount(const Date& date, const string& id, double rate);
34     double getRate() const { return rate; }
35     void deposit(const Date& date, double amount, const string& desc);
36     void withdraw(const Date& date, double amount, const string& desc);
37     void settle(const Date& date);
38  
39 };
40  
41 class CreditAccount : public Account {
42 private:
43     Accumulator acc;
44     double credit;
45     double rate;
46     double fee;
47     double getDebt() const {
48         double balance = getBalance();
49         return (balance < 0 ? balance : 0);
50  
51     }
52 public:
53     CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
54     double getCredit() const { return credit; }
55     double getRate() const { return rate; }
56     double getFee() const { return fee; }
57     double getAvailableCredit() const {
58         if (getBalance() < 0) return credit + getBalance();
59         else return credit;
60  
61     }
62     void deposit(const Date& date, double amount, const string& desc);
63     void withdraw(const Date& date, double amount, const string& desc);
64     void settle(const Date& date);
65     void show() const;
66  
67 };

account.cpp

 1 #include "account.h"
 2 #include <cmath>
 3 #include<iostream>
 4 using namespace std;
 5  
 6 double Account::total = 0;
 7 Account::Account(const Date& date, const string& id) : id(id), balance(0) {
 8     date.show();
 9     cout << "\t#" << id << " created" << endl;
10  
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  
22 void Account::show() const {
23     cout << id << "\tBalance: " << balance;
24  
25 }
26  
27 void Account::error(const string& msg) const {
28     cout << "Error (#" << id << "): " << msg << endl;
29  
30 }
31  
32 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate)
33     : Account(date, id), rate(rate), acc(date, 0) {}
34  
35 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
36     record(date, amount, desc);
37     acc.change(date, getBalance());
38  
39 }
40  
41 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
42     if (amount > getBalance()) {
43         error("not enough money");
44  
45     }
46     else {
47         record(date, -amount, desc);
48         acc.change(date, getBalance());
49  
50     }
51  
52 }
53  
54 void SavingsAccount::settle(const Date& date) {
55     if (date.getMonth() == 1)
56     {
57         double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
58         if (interest != 0) record(date, interest, "interest");
59         acc.reset(date, getBalance());
60     }
61 }
62  
63 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
64     : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {}
65  
66 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
67     record(date, amount, desc);
68     acc.change(date, getDebt());
69  
70 }
71  
72 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
73     if (amount - getBalance() > credit) {
74         error("not enough credit");
75  
76     }
77     else {
78         record(date, -amount, desc);
79         acc.change(date, getDebt());
80  
81     }
82  
83 }
84  
85 void CreditAccount::settle(const Date& date) {
86     double interest = acc.getSum(date) * rate;
87     if (interest != 0) record(date, interest, "interest");
88     if (date.getMonth() == 1) record(date, -fee, "annual fee");
89     acc.reset(date, getDebt());
90  
91 }
92  
93 void CreditAccount::show() const {
94     Account::show();
95     cout << "\tAvailable credit: " << getAvailableCredit();
96 }

8_8.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             }
39             break;
40         case 'c':
41             cin >> day;
42             if (day < date.getDay()) {
43                 cout << "You cannot specify a previous day";
44  
45             }
46             else if (day > date.getMaxDay())
47                 cout << "Invalid day";
48             else date = Date(date.getYear(), date.getMonth(), day);
49             break;
50         case 'n':
51             if (date.getMonth() == 12)
52                 date = Date(date.getYear() + 1, 1, 1);
53             else
54             {
55                 date = Date(date.getYear(), date.getMonth() + 1, 1);
56             }
57             for (int i = 0; i < n; i++) {
58                 accounts[i]->settle(date);
59  
60             }
61             break;
62  
63         }
64  
65     } while (cmd != 'e');
66     return 0;
67  
68 }

运行截图

posted @ 2024-12-09 10:55  臣子民  阅读(1)  评论(0)  编辑  收藏  举报