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实验5 继承和多态

时间：2023-12-03 20:57:39浏览次数：23  
标签：const string 继承 double void 多态 Date 实验 date

任务3

 1 #include<iostream>
 2 #include<string>
 3 using namespace std;
 4 
 5 class MachinePets {
 6 public:
 7     MachinePets(const string& s);
 8     MachinePets();
 9     string get_nickname() const;
10     virtual string talk() = 0;
11 
12 protected:
13     string nickname;
14 };
15 
16 MachinePets::MachinePets(const string& s) : nickname(s) {}
17 
18 MachinePets::MachinePets() : nickname("") {}
19 
20 string MachinePets::get_nickname() const {
21     return nickname;
22 }
23 
24 class PetCats : public MachinePets {
25 public:
26     PetCats(const string& s);
27     string talk() override;
28 };
29 
30 PetCats::PetCats(const string& s) : MachinePets(s) {}
31 
32 string PetCats::talk() {
33     return "miao wu~";
34 }
35 
36 class PetDogs : public MachinePets {
37 public:
38     PetDogs(const string& s);
39     string talk() override;
40 };
41 
42 PetDogs::PetDogs(const string& s) : MachinePets(s) {}
43 
44 string PetDogs::talk() {
45     return "wang wang~";
46 }
MachinePets.hpp 
 1 #include <iostream>
 2 #include"machinepets.hpp"
 3 void play(MachinePets & obj) {
 4         std::cout << obj.get_nickname() << " says " << obj.talk() << std::endl;
 5     
 6 }
 7 
 8 void test() {
 9         PetCats cat("miku");
10         PetDogs dog("da huang");
11         play(cat);
12         play(dog);
13     
14 }
15 int main() {
16         test();
17     
18 }
task3.cpp

运行结果：

 

任务4

 1 #include<iostream>
 2 #include<vector>
 3 #include<string>
 4 using namespace std;
 5 
 6 class Person {
 7 public:
 8     Person();
 9     Person(string n, string t, string e = "");
10     Person(const Person& p);
11     void update_telephone();
12     void update_email();
13     friend istream& operator>>(istream& is, Person& p);
14     friend ostream& operator<<(ostream& os, const Person& p);
15     friend bool operator==(const Person& a, const Person& b);
16 
17 private:
18     string name;
19     string telephone;
20     string email;
21 };
22 
23 Person::Person() : name(""), telephone(""), email("") {}
24 
25 Person::Person(string n, string t, string e) : name(n), telephone(t), email(e) {}
26 
27 Person::Person(const Person& p) : name(p.name), telephone(p.telephone), email(p.email) {}
28 
29 void Person::update_telephone() {
30     cout << "输入电话号码:";
31     cin >> telephone;
32     cout << "电话号码已更新" << endl;
33 }
34 
35 void Person::update_email() {
36     cout << "输入email地址:";
37     cin >> email;
38     cout << "email地址已更新" << endl;
39 }
40 
41 istream& operator>>(istream& is, Person& p) {
42     is >> p.name >> p.telephone >> p.email;
43     return is;
44 }
45 
46 ostream& operator<<(ostream& os, const Person& p) {
47     os << p.name << " " << p.telephone << " " << p.email;
48     return os;
49 }
50 
51 bool operator==(const Person& a, const Person& b) {
52     return (a.name == b.name);
53 }
Person.hpp 
 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 }
task4.cpp

运行结果：

 

任务5

 1 #include"date.h"
 2 #include"accumulator.h"
 3 #include<string>
 4 class Account
 5 {
 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 getToal() { 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);
21     virtual void show() const;
22 };
23 class SavingsAccount :public Account
24 {
25 private:
26     Accumulator acc;
27     double rate;
28 public:
29     SavingsAccount(const Date& date, const std::string& id, double rate);
30     double getRate() const { return rate; }
31     void deposit(const Date& date, double amount, const std::string& desc);
32     void withdraw(const Date& date, double amount, const std::string& desc);
33     void settle(const Date& date);
34 };
35 class CreditAccount :public Account
36 {
37 private:
38     Accumulator acc;
39     double credit;
40     double rate;
41     double fee;
42     double getDebt() const
43     {
44         double balance = getBalance();
45         return(balance < 0 ? balance : 0);
46     }
47 public:
48     CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee);
49     double getCredit() const { return credit; }
50     double getRate() const { return rate; }
51     double getFee() const { return fee; }
52     double getAvailableCredit() const {
53         if (getBalance() < 0)
54             return credit + getBalance();
55         else
56             return credit;
57     }
58     void deposit(const Date& date, double amount, const std::string& desc);
59     void withdraw(const Date& date, double amount, const std::string& desc);
60     void settle(const Date& date);
61     void show() const;
62 };
account.h 
 1 #include"date.h"
 2 class Accumulator
 3 {
 4 private:
 5     Date lastDate;
 6     double value;
 7     double sum;
 8 public:
 9     Accumulator(const Date& date, double value) :lastDate(date), value(value), sum(0) {}
10     double getSum(const Date& date) const
11     {
12         return sum + value * (date - lastDate);
13     }
14     void change(const Date& date, double value)
15     {
16         sum = getSum(date);
17         lastDate = date; this->value = value; sum = 0;
18     }
19     void reset(const Date& date, double value)
20     {
21         lastDate = date; this->value = value;
22     }
23 };
Accumulator.h 
 1 class Date
 2 {
 3 private:
 4     int year;
 5     int month;
 6     int day;
 7     int totalDays;
 8 public:
 9     Date(int year, int month, int day);
10     int getYear() const { return year; }
11     int getMonth() const { return month; }
12     int getDay() const { return day; }
13     int getMaxDay() const;
14     bool isLeapYear() const
15     {
16         return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
17     }
18     void show() const;
19     int operator-(const Date& date) const
20     {
21         return totalDays - date.totalDays;
22     }
23 };
date.h 
include"account.h"
#include<cmath>
#include<iostream>
using namespace std;
double Account::total = 0;
Account::Account(const Date& date, const std::string& id) :id(id), balance(0)
{
    date.show(); cout << "\t#" << id << "created" << endl;
}
void Account::record(const Date& date, double amount, const string& desc)
{
    amount = floor(amount * 100 + 0.5) / 100;
    balance += amount; total += amount;
    date.show();
    cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
}
void Account::show() const { cout << id << "\tBalance:" << balance; }
void Account::error(const string& msg) const
{
    cout << "Error(#" << id << "):" << msg << endl;
}
SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) :Account(date, id), rate(rate), acc(date, 0) {
}
void SavingsAccount::deposit(const Date& date, double amount, const string& desc)
{
    record(date, amount, desc);
    acc.change(date, getBalance());
}
void SavingsAccount::withdraw(const Date& date, double amount, const string& desc)
{
    if (amount > getBalance())
    {
        error("not enough money");
    }
    else
    {
        record(date, -amount, desc);
        acc.change(date, getBalance());
    }
}
void SavingsAccount::settle(const Date& date)
{
    if (date.getMonth() == 1)
    {
        double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
        if (interest != 0) record(date, interest, "interest");
        acc.reset(date, getBalance());
    }
}
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) {
}
void CreditAccount::deposit(const Date& date, double amount, const string& desc)
{
    record(date, amount, desc);
    acc.change(date, getDebt());
}
void CreditAccount::withdraw(const Date& date, double amount, const string& desc)
{
    if (amount - getBalance() > credit)
    {
        error("not enough credit");
    }
    else
    {
        record(date, -amount, desc);
        acc.change(date, getDebt());
    }
}
void CreditAccount::settle(const Date& date)
{
    double interest = acc.getSum(date) * rate;
    if (interest != 0) record(date, interest, "interest");
    if (date.getMonth() == 1) record(date, -fee, "annual fee");
    acc.reset(date, getDebt());
}
void CreditAccount::show() const
{
    Account::show();
    cout << "\tAvailable credit:" << getAvailableCredit();
}
account.cpp 
 1 #include"date.h"
 2 #include<iostream>
 3 #include<cstdlib>
 4 using namespace std;
 5 namespace
 6 {
 7     const int DAYS_BEFORE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304,334,365 };
 8 }
 9 Date::Date(int year, int month, int day) :year(year), month(month), day(day)
10 {
11     if (day <= 0 || day > getMaxDay())
12     {
13         cout << "INvalid date:";
14         show();
15         cout << endl;
16         exit(1);
17     }
18     int years = year - 1;
19     totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
20     if (isLeapYear() && month > 2) totalDays++;
21 }
22 int Date::getMaxDay() const
23 {
24     if (isLeapYear() && month == 2)
25         return 29;
26     else
27         return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
28 }
29 void Date::show() const
30 {
31     cout << getYear() << "-" << getMonth() << "-" << getDay();
32 }
date.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 }
main.cpp

运行结果：

 

标签：const,string,继承,double,void,多态,Date,实验,date
From： https://www.cnblogs.com/8716ydc/p/17873737.html

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