实验5 继承和多态

实验任务3

源代码：

pets.hpp

 1 #pragma once
 2 
 3 #include<iostream>
 4 #include<string>
 5 
 6 using namespace std;
 7 class MachinePets{
 8     public:
 9         MachinePets(const string &s);
10         string get_nickname()const;
11         virtual string talk() = 0;
12     private:
13         string nickname;
14 };
15 MachinePets::MachinePets(const string &s):nickname(s){
16 }
17 string MachinePets::get_nickname()const{
18     return nickname;    
19 }
20 class PetCats: public MachinePets{
21     public:
22         PetCats(const string &s1):MachinePets(s1){
23         };
24     public:
25         string talk() override;
26 };
27 string PetCats::talk(){
28     return "miao miao~";
29 }
30 class PetDogs: public MachinePets{
31     public:
32         PetDogs(const string &s2):MachinePets(s2){
33         };
34     public:
35         string talk() override;
36 };
37 string PetDogs::talk(){
38     return "ao wu~";
39 }
View Code

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("mimi"));
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 }
View Code

结果截图：

实验任务4：

源代码：

film.hpp

 1 #pragma once 
 2 #include<iostream>
 3 #include<string>
 4 #include<iomanip>
 5 using namespace std;
 6 
 7 class Film{
 8     public:
 9         Film(const string &name="",const string &director="",const string &country="",const int &year=0);
10         friend ostream& operator<<(ostream &out,const Film &film);
11         friend istream& operator>>(istream &in,Film &film);
12         int get_year()const{
13             return year;
14         };
15     public:
16         string name; //片名 
17         string director; //导演 
18         string country; //国家 
19         int year; //年份 
20 };
21 Film::Film(const string &name,const string &director,const string &country,const int &year){
22     this->name = name;
23     this->director = director;
24     this->country = country;
25     this->year = year;
26 }
27 ostream& operator<<(ostream &out,const Film &film){
28     out << left;
29      out << setw(15) << film.name 
30          << setw(15) << film.director 
31          << setw(15) << film.country 
32          << setw(15) << film.year;
33      return out;
34 
35 }
36 istream& operator>>(istream &in,Film &film){
37     cout << "录入片名：";in >> film.name;  
38     cout << "录入导演：";in >> film.director;
39     cout << "录入制片国家/地区：";in >> film.country; 
40     cout << "录入上映年份：";in >> film.year;
41     return in;
42 }
43 //升序 
44 bool compare_by_year(const Film &film1,const Film &film2){
45     return film1.get_year() < film2.get_year();
46 }
View Code

task4.cpp

 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 }
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运行结果截图：

实验任务5：

Complex.hpp

 1 #pragma once
 2 #include<iostream>
 3 #include<math.h>
 4 using namespace std;
 5 
 6 template<typename T>
 7 class Complex{
 8     public:
 9         Complex(T real=0,T imag=0){
10             this->real = real;
11             this->imag = imag;
12         };
13         Complex(const Complex &c){
14             real = c.real;
15             imag = c.imag;
16         };
17         T get_real()const{
18             return real;
19         };
20         T get_imag()const{
21             return imag;
22         };
23         friend void operator+=(Complex &c1,Complex c2){
24             c1.real = c1.real + c2.real;
25             c1.imag = c1.imag + c2.imag;
26         };
27         friend Complex operator+(const Complex &c1,const Complex &c2){
28             Complex c3;
29             c3.real = c1.real + c2.real;
30             c3.imag = c1.imag + c2.imag;
31             return c3;
32         };
33         friend bool operator==(const Complex &c1,const Complex &c2){
34             if(c1.real==c2.real&&c1.imag==c2.imag)
35                 return 1;
36                 else return 0; 
37         };
38         friend ostream& operator<<(ostream &out,const Complex &c){
39             if(c.imag<0)
40             out << c.real << " "<< "-" << " " << fabs(c.imag)<< "i";
41             else out << c.real << " " << "+" << " " << c.imag << "i";
42             return out;            
43         };
44         friend istream& operator>>(istream &in,Complex &c){
45             in >> c.real >> c.imag;    
46             return in;
47         };
48         private:
49         T real,imag;
50     };
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 }
View Code

运行结果截图：

实验任务6：

源代码：

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     void show() const;
20     int operator-(const Date& date) const {
21         return totalDays - date.totalDays;
22     }
23 };
date.h
View Code

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     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
View Code

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 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
View Code

data.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 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 }

data.cpp
View Code

account.cpp

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 
33 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
34     record(date, amount, desc);
35     acc.change(date, getBalance());
36 }
37 
38 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
39     if (amount > getBalance()) {
40         error("not enough money");
41     }
42     else {
43         record(date, -amount, desc);
44         acc.change(date, getBalance());
45     }
46 }
47 
48 void SavingsAccount::settle(const Date& date) {
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 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
55     : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {
56 }
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
View Code

task6.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
View Code

 

posted @ 2024-12-04 20:36  你午睡了ma  阅读(6)  评论(0)  编辑  收藏  举报