实验5 继承和多态

实验任务3

pets.hpp:

 1 # pragma once
 2 
 3 #include <iostream>
 4 #include <string>
 5 
 6 using namespace std;
 7 
 8 class MachinePets{
 9 private:
10     string nickname;
11 
12 public:
13     MachinePets(const string s) :nickname{s} {};
14     string get_nickname() const {return nickname;};
15     virtual string talk() = 0;
16 };
17 
18 class PetCats: public MachinePets {
19 public:
20     PetCats(const string s): MachinePets{s} {};
21     string talk() {return "miao wu~";};
22 };
23 
24 class PetDogs: public MachinePets {
25 public:
26     PetDogs(const string s): MachinePets {s} {};
27     string talk() {return "wang wang~";};
28 };
View Code

task3.cpp:

 1 #include <iostream>
 2 #include "pets.hpp"
 3 
 4 void play(MachinePets &obj) {
 5     std::cout << obj.get_nickname() << " says " << obj.talk() << std::endl;
 6 }
 7 
 8 void test() {
 9     PetCats cat("miku");
10     PetDogs dog("da huang");
11 
12     play( cat );
13     play( dog );
14 }
15 
16 int main() {
17     test();
18 }
View Code

运行测试截图：

实验任务4

Person.hpp:

 1 #pragma once
 2 
 3 #include <iostream>
 4 #include <string>
 5 
 6 using namespace std;
 7 
 8 class Person{
 9 private:
10     string name,telephone,email;
11 public:
12     Person();
13     Person(const string &name, const string &telephone, const string &email);
14     Person(const Person &);
15 
16     void update_telephone();
17     void update_email();
18 
19     friend std::ostream& operator<<(std::ostream &os, const Person &p);
20     friend std::istream& operator>>(std::istream &is, Person &p);
21     friend bool operator==(const Person &p1, const Person &p2);
22 };
23 
24 Person::Person() {}
25 
26 Person::Person(const string &name, const string &telephone, const string &email): name{name}, telephone{telephone}, email{email} {
27 }
28 
29 Person::Person(const Person &p): name{p.name}, telephone{p.telephone}, email{p.email} {
30 }
31 
32 void Person::update_telephone() {
33     cin.clear();
34     cout << "输入电话号码：";
35     string telephone;
36     getline(cin,telephone);
37     cout << "电话号码已更新..." << endl;
38 }
39 
40 void Person::update_email() {
41     cin.clear();
42     cout << "输入email地址：";
43     string email;
44     getline(cin,email);
45     cout << "email地址已更新..." << endl;
46 }
47 
48 std::ostream& operator<<(std::ostream &os, const Person &p) {
49     os << p.name << endl << p.telephone << endl << p.email << endl;
50     return os;
51 }
52 
53 std::istream& operator>>(std::istream &is, Person &p) {
54     is >> p.name >> p.telephone >> p.email;
55     return is;
56 }
57 
58 bool operator==(const Person &p1, const Person &p2) {
59     return ((p1.name == p2.name) && (p1.telephone == p2.telephone));
60 }
View Code

task4.cpp:

 1 #include <iostream>
 2 #include <vector>
 3 #include "Person.hpp"
 4 
 5 void test() {
 6     using namespace std;
 7 
 8     vector<Person> phone_book;
 9     Person p;
10 
11     cout << "输入一组联系人的联系方式，E直至按下Ctrl+Z终止\n";
12     while(cin >> p) 
13         phone_book.push_back(p);
14     
15     cout << "\n更新phone_book中索引为0的联系人的手机号、邮箱:\n";
16     phone_book.at(0).update_telephone();
17     phone_book.at(0).update_email();
18 
19     cout << "\n测试两个联系人是否是同一个:\n";
20     cout << boolalpha << (phone_book.at(0) == phone_book.at(1)) << endl;
21 }
22 
23 int main() {
24     test();
25 }
View Code

运行测试截图：

实验任务5

date.h:

 1 #ifndef _ _DATE_H_ _
 2 #define _ _DATE_H_ _
 3 
 4 class Date {
 5 private:
 6     int year;
 7     int month;
 8     int day;
 9     int totalDays;
10 
11 public:
12     Date(int year, int month, int day);
13     int getYear() const { return year; }
14     int getMonth() const { return month; }
15     int getDay() const { return day; }
16     int getMaxDay() const;
17     bool isLeapYear() const {
18         return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
19     }
20     void show() const;
21     int operator - (const Date& date) const {
22         return totalDays - date.totalDays;
23     }
24 };
25 
26 #endif //_ _DATE_H_ _
View Code

date.cpp:

 1 #include"date.h"
 2 #include<iostream>
 3 #include<cstdlib>
 4 
 5 using namespace std;
 6 
 7 namespace
 8 {
 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 {
14     if (day <= 0 || day > getMaxDay())
15     {
16         cout << "INvalid date:";
17         show();
18         cout << endl;
19         exit(1);
20     }
21     int years = year - 1;
22     totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
23     if (isLeapYear() && month > 2) totalDays++;
24 }
25 
26 int Date::getMaxDay() const
27 {
28     if (isLeapYear() && month == 2)
29         return 29;
30     else
31         return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
32 }
33 
34 void Date::show() const
35 {
36     cout << getYear() << "-" << getMonth() << "-" << getDay();
37 }
View Code

accumulator.h:

 1 #ifndef _ _ACCUMULATOR_H_ _
 2 #define _ _ACCUMULATOR_H_ _
 3 #include "date.h"
 4 class Accumulator
 5 {
 6 private:
 7     Date lastDate;
 8     double value;
 9     double sum;
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; this->value = value; sum = 0;
20     }
21 
22     void reset(const Date& date, double value) {
23         lastDate = date; this->value = value;
24     }
25 };
26 #endif // _ _ACCUMULATOR_H_ _
View Code

account.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 {
 9 private:
10     std::string id;
11     double balance;
12     static double total;
13 protected:
14     Account(const Date& date, const std::string& id);
15     void record(const Date& date, double amount, const std::string& desc);
16     void error(const std::string& msg) const;
17 public:
18     const std::string& getId() const { return id; }
19     double getBalance() const { return balance; }
20     static double getToal() { return total; }
21     virtual void deposit(const Date& date, double amount, const std::string& desc) = 0;
22     virtual void withdraw(const Date& date, double amount, const std::string& desc) = 0;
23     virtual void settle(const Date& date);
24     virtual void show() const;
25 };
26 
27 class SavingsAccount :public Account
28 {
29 private:
30     Accumulator acc;
31     double rate;
32 public:
33     SavingsAccount(const Date& date, const std::string& id, double rate);
34     double getRate() const { return rate; }
35     void deposit(const Date& date, double amount, const std::string& desc);
36     void withdraw(const Date& date, double amount, const std::string& desc);
37     void settle(const Date& date);
38 };
39 
40 class CreditAccount :public Account
41 {
42 private:
43     Accumulator acc;
44     double credit;
45     double rate;
46     double fee;
47     double getDebt() const
48     {
49         double balance = getBalance();
50         return(balance < 0 ? balance : 0);
51     }
52 public:
53     CreditAccount(const Date& date, const std::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)
59             return credit + getBalance();
60         else
61             return credit;
62     }
63     void deposit(const Date& date, double amount, const std::string& desc);
64     void withdraw(const Date& date, double amount, const std::string& desc);
65     void settle(const Date& date);
66     void show() const;
67 };
View Code

account.cpp:

 1 #include"account.h"
 2 #include<cmath>
 3 #include<iostream>
 4 
 5 using namespace std;
 6 
 7 double Account::total = 0;
 8 
 9 Account::Account(const Date& date, const std::string& id) :id(id), balance(0)
10 {
11     date.show(); cout << "\t#" << id << "created" << endl;
12 }
13 void Account::record(const Date& date, double amount, const string& desc)
14 {
15     amount = floor(amount * 100 + 0.5) / 100;
16     balance += amount; total += amount;
17     date.show();
18     cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
19 }
20 void Account::show() const { cout << id << "\tBalance:" << balance; }
21 void Account::error(const string& msg) const
22 {
23     cout << "Error(#" << id << "):" << msg << endl;
24 }
25 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) :Account(date, id), rate(rate), acc(date, 0) {
26 }
27 void SavingsAccount::deposit(const Date& date, double amount, const string& desc)
28 {
29     record(date, amount, desc);
30     acc.change(date, getBalance());
31 }
32 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc)
33 {
34     if (amount > getBalance())
35     {
36         error("not enough money");
37     }
38     else
39     {
40         record(date, -amount, desc);
41         acc.change(date, getBalance());
42     }
43 }
44 void SavingsAccount::settle(const Date& date)
45 {
46     if (date.getMonth() == 1)
47     {
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) :Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {
54 }
55 void CreditAccount::deposit(const Date& date, double amount, const string& desc)
56 {
57     record(date, amount, desc);
58     acc.change(date, getDebt());
59 }
60 void CreditAccount::withdraw(const Date& date, double amount, const string& desc)
61 {
62     if (amount - getBalance() > credit)
63     {
64         error("not enough credit");
65     }
66     else
67     {
68         record(date, -amount, desc);
69         acc.change(date, getDebt());
70     }
71 }
72 void CreditAccount::settle(const Date& date)
73 {
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 void CreditAccount::show() const
80 {
81     Account::show();
82     cout << "\tAvailable credit:" << getAvailableCredit();
83 }
View Code

8_8.cpp:

 1 #include"account.h"
 2 #include<iostream>
 3 using namespace std;
 4 int main()
 5 {
 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::getToal() << "\tcommand";
17         int index, day;
18         double amount; string desc;
19         cin >> cmd;
20         switch (cmd)
21         {
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             {
35                 cout << "[" << i << "]";
36                 accounts[i]->show();
37                 cout << endl;
38             }
39             break;
40         case'c':
41             cin >> day;
42             if (day << date.getDay())
43                 cout << "You cannot specify a previous day";
44             else if (day > date.getMaxDay())
45                 cout << "Invalid day";
46             else
47                 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
53                 date = Date(date.getYear(), date.getMonth() + 1, 1);
54             for (int i = 0; i < n; i++)
55                 accounts[i]->settle(date);
56             break;
57         }
58     } while (cmd != 'e');
59     return 0;
60 }
View Code

运行测试截图:

 

posted @ 2023-12-03 23:57  oacuiaka  阅读(16)  评论(0)    收藏  举报