实验五_OOP_张文瑞_202213260018

 1 #include <iostream>
 2 using std::string;
 3 class MachinePets {
 4     private:
 5         string nickname;
 6     public:
 7         MachinePets(const string s);
 8         string get_nickname() const;
 9         virtual string talk() = 0;
10 };
11 MachinePets::MachinePets(const string s) : nickname{s} {}
12 string MachinePets::get_nickname() const {return nickname;};
13 class PetCats : public MachinePets {
14     public:
15         PetCats(const string s);
16         string talk() override;
17 };
18 PetCats::PetCats(const string s) : MachinePets{s} {}
19 string PetCats::talk() {
20     return "miao wu~";
21 }
22 class PetDogs : public MachinePets {
23     public:
24         PetDogs(const string s);
25         string talk() override;
26 };
27 PetDogs::PetDogs(const string s) : MachinePets{s} {}
28 string PetDogs::talk() {
29     return "wang wang~";
30 }

 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 }

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

#include <iostream>
#include <vector>
#include "Person.hpp"

void test() {
    using namespace std;

    vector<Person> phone_book;
    Person p;

    cout << "输入一组联系人的联系方式，E直至按下Ctrl+Z终止\n";
    while(cin >> p)
        phone_book.push_back(p);

    cout << "\n更新phone_book中索引为0的联系人的手机号、邮箱:\n";
    phone_book.at(0).update_telephone();
    phone_book.at(0).update_email();

    cout << "\n测试两个联系人是否是同一个:\n";
    cout << boolalpha << (phone_book.at(0) == phone_book.at(1)) << endl;
}

int main() {
    test();
}

#ifndef __DATE_H__
#define __DATE_H__

class Date {    //日期类
private:
    int year;        //年
    int month;        //月
    int day;        //日
    int totalDays;    //该日期是从公元元年1月1日开始的第几天

public:
    Date(int year, int month, int day);    //用年、月、日构造日期
    int getYear() const { return year; }
    int getMonth() const { return month; }
    int getDay() const { return day; }
    int getMaxDay() const;        //获得当月有多少天
    bool isLeapYear() const {    //判断当年是否为闰年
        return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
    }
    void show() const;            //输出当前日期
    //计算两个日期之间差多少天
    int operator - (const Date& date) const {
        return totalDays - date.totalDays;
    }
};

#endif //__DATE_H__

#include "date.h"
#include <iostream>
#include <cstdlib>
using namespace std;

namespace {    //namespace使下面的定义只在当前文件中有效
    //存储平年中某个月1日之前有多少天，为便于getMaxDay函数的实现，该数组多出一项
    const int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
}

Date::Date(int year, int month, int day) : year(year), month(month), day(day) {
    if (day <= 0 || day > getMaxDay()) {
        cout << "Invalid date: ";
        show();
        cout << endl;
        exit(1);
    }
    int years = year - 1;
    totalDays = years * 365 + years / 4 - years / 100 + years / 400
        + DAYS_BEFORE_MONTH[month - 1] + day;
    if (isLeapYear() && month > 2) totalDays++;
}

int Date::getMaxDay() const {
    if (isLeapYear() && month == 2)
        return 29;
    else
        return DAYS_BEFORE_MONTH[month]- DAYS_BEFORE_MONTH[month - 1];
}

void Date::show() const {
    cout << getYear() << "-" << getMonth() << "-" << getDay();
}

#ifndef __ACCUMULATOR_H__
#define __ACCUMULATOR_H__
#include "date.h"

class Accumulator {    //将某个数值按日累加
private:
    Date lastDate;    //上次变更数值的时期
    double value;    //数值的当前值
    double sum;        //数值按日累加之和
public:
    //构造函数，date为开始累加的日期，value为初始值
    Accumulator(const Date &date, double value)
        : lastDate(date), value(value), sum(0) { }

    //获得到日期date的累加结果
    double getSum(const Date &date) const {
        return sum + value * (date - lastDate);
    }

    //在date将数值变更为value
    void change(const Date &date, double value) {
        sum = getSum(date);
        lastDate = date;
        this->value = value;
    }

    //初始化，将日期变为date，数值变为value，累加器清零
    void reset(const Date &date, double value) {
        lastDate = date;
        this->value = value;
        sum = 0;
    }
};

#endif //__ACCUMULATOR_H__

#include "account.h"
#include <iostream>
using namespace std;

int main() {
    Date date(2008, 11, 1);    //起始日期
    //建立几个账户
    SavingsAccount sa1(date, "S3755217", 0.015);
    SavingsAccount sa2(date, "02342342", 0.015);
    CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
    Account *accounts[] = { &sa1, &sa2, &ca };
    const int n = sizeof(accounts) / sizeof(Account*);    //账户总数

    cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
    char cmd;
    do {
        //显示日期和总金额
        date.show();
        cout << "\tTotal: " << Account::getTotal() << "\tcommand> ";

        int index, day;
        double amount;
        string desc;

        cin >> cmd;
        switch (cmd) {
        case 'd':    //存入现金
            cin >> index >> amount;
            getline(cin, desc);
            accounts[index]->deposit(date, amount, desc);
            break;
        case 'w':    //取出现金
            cin >> index >> amount;
            getline(cin, desc);
            accounts[index]->withdraw(date, amount, desc);
            break;
        case 's':    //查询各账户信息
            for (int i = 0; i < n; i++) {
                cout << "[" << i << "] ";
                accounts[i]->show();
                cout << endl;
            }
            break;
        case 'c':    //改变日期
            cin >> day;
            if (day < date.getDay())
                cout << "You cannot specify a previous day";
            else if (day > date.getMaxDay())
                cout << "Invalid day";
            else
                date = Date(date.getYear(), date.getMonth(), day);
            break;
        case 'n':    //进入下个月
            if (date.getMonth() == 12)
                date = Date(date.getYear() + 1, 1, 1);
            else
                date = Date(date.getYear(), date.getMonth() + 1, 1);
            for (int i = 0; i < n; i++)
                accounts[i]->settle(date);
            break;
        }
    } while (cmd != 'e');
    return 0;
}