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实验五 继承和多态

时间：2023-12-03 20:22:25浏览次数：21  
标签：std const string 继承 double 多态 Date 实验 date

实验任务3：

1.代码:

pets.hpp:

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

task3.cpp:

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

2.图片：

 

实验任务4：
1.代码：
person.hpp:

 1 #pragma once 
 2 
 3 #include <iostream>
 4 #include <string>
 5 using namespace std;
 6 class Person {
 7 private:
 8     string name;
 9     string telephone;
10     string email;
11 
12 public:
13     Person() {}
14     Person(const string& name, const string& telephone, const string& email = "") : name(name), telephone(telephone), email(email) {}
15     Person(const Person& other) : name(other.name), telephone(other.telephone), email(other.email) {}
16 
17     void update_telephone() {
18         cout << "请输入新的手机号码：";
19         cin >> telephone;
20         cout<<"电话号码已更新...";
21         cout<<endl; 
22     }
23 
24     void update_email() {
25         cout << "请输入新的邮箱地址：";
26         cin >> email;
27         cout<<"邮箱地址已更新...";
28         cout<<endl;
29     }
30 
31     friend std::ostream& operator<<(std::ostream& os, const Person& person) {
32         os << "姓名：" << person.name << "\n手机号码：" << person.telephone << "\n邮箱地址：" << person.email;
33         return os;
34     }
35 
36       friend std::istream& operator>>(std::istream& is, Person& person) {
37         cout << "请输入姓名: ";
38         getline(is, person.name);
39         if (is.eof()) {
40         return is; 
41     }
42         cout << "请输入电话号码: ";
43         getline(is, person.telephone);
44         cout << "请输入邮箱 (可不填): ";
45         getline(is, person.email);
46         cout<<endl; 
47         return is;
48     }
49 
50 
51     friend bool operator==(const Person& person1, const Person& person2) {
52         return person1.name == person2.name && person1.telephone == person2.telephone;
53     }
54 };
55
View Code

task4.cpp:

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

2.图片：

 

 

实验任务5：

 1.代码：

account.h:

 1 #pragma once
 2 
 3 
 4 #include"date.h"
 5 #include"accumulator.h"
 6 #include<string>
 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() const { return id; }
18     double getBalance() const { return balance; }
19     static double getToal() { 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 
26 class SavingsAccount :public Account {
27 private:
28     Accumulator acc;
29     double rate;
30 public:
31     SavingsAccount(const Date& date, const std::string& id, double rate);
32     double getRate() const { return rate; }
33     void deposit(const Date& date, double amount, const std::string& desc);
34     void withdraw(const Date& date, double amount, const std::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     {
46         double balance = getBalance();
47         return(balance < 0 ? balance : 0);
48     }
49 public:
50     CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee);
51     double getCredit() const { return credit; }
52     double getRate() const { return rate; }
53     double getFee() const { return fee; }
54     double getAvailableCredit() const {
55         if (getBalance() < 0)
56             return credit + getBalance();
57         else
58             return credit;
59     }
60     void deposit(const Date& date, double amount, const std::string& desc);
61     void withdraw(const Date& date, double amount, const std::string& desc);
62     void settle(const Date& date);
63     void show() const;
64 };
View Code

accumulator.h:

 1 #pragma once
 2 
 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     {
13         return sum + value * (date - lastDate);
14     }
15     void change(const Date& date, double value)
16     {
17         sum = getSum(date);
18         lastDate = date; this->value = value; sum = 0;
19     }
20     void reset(const Date& date, double value)
21     {
22         lastDate = date; this->value = value; sum = 0;
23     }
24 
25 
26 };
View Code

date.h:

 1 #pragma once
 2 
 3 
 4 class Date {
 5 private:
 6     int year;
 7     int month;
 8     int day;
 9     int totalDays;
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 };
View Code

account.cpp:

 1 #include"account.h"
 2 #include<cmath>
 3 #include<iostream>
 4 using namespace std;
 5 double Account::total = 0;
 6 Account::Account(const Date& date, const std::string& id) :id(id), balance(0) {
 7     date.show(); cout << "\t#" << id << "created" << endl;
 8 }
 9 void Account::record(const Date& date, double amount, const string& desc) {
10     amount = floor(amount * 100 + 0.5) / 100;
11     balance += amount; total += amount;
12     date.show();
13     cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
14 }
15 void Account::show() const { cout << id << "\tBalance:" << balance; }
16 void Account::error(const string& msg) const {
17     cout << "Error(#" << id << "):" << msg << endl;
18 }
19 
20 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) :Account(date, id), rate(rate), acc(date, 0) {
21 }
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     {
29         error("not enough money");
30     }
31     else
32     {
33         record(date, -amount, desc);
34         acc.change(date, getBalance());
35     }
36 }
37 void SavingsAccount::settle(const Date& date)
38 {
39     if (date.getMonth() == 1)
40     {
41         double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
42         if (interest != 0) record(date, interest, "interest");
43         acc.reset(date, getBalance());
44     }
45 
46 }
47 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) {
48 }
49 void CreditAccount::deposit(const Date& date, double amount, const string& desc)
50 {
51     record(date, amount, desc);
52     acc.change(date, getDebt());
53 }
54 void CreditAccount::withdraw(const Date& date, double amount, const string& desc)
55 {
56     if (amount - getBalance() > credit)
57     {
58         error("not enough credit");
59     }
60     else
61     {
62         record(date, -amount, desc);
63         acc.change(date, getDebt());
64     }
65 }
66 void CreditAccount::settle(const Date& date)
67 {
68     double interest = acc.getSum(date) * rate;
69     if (interest != 0) record(date, interest, "interest");
70     if (date.getMonth() == 1) record(date, -fee, "annual fee");
71     acc.reset(date, getDebt());
72 }
73 void CreditAccount::show() const
74 {
75     Account::show();
76     cout << "\tAvailable credit:" << getAvailableCredit();
77 }
View Code

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 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 = year * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
19     if (isLeapYear() && month > 2)totalDays++;
20 
21 }
22 
23 int Date::getMaxDay() const {
24     if (isLeapYear() && month == 2)return 29;
25     else
26         return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
27 
28 }
29 
30 void Date::show() const {
31     cout << getYear() << "-" << getMonth() << "-" << getDay();
32 
33 }
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 
61 }
View Code

2.图片：

 

标签：std,const,string,继承,double,多态,Date,实验,date
From： https://www.cnblogs.com/yili123/p/17860515.html

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