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实验五 继承和多态

时间：2023-12-03 23:56:58浏览次数：32  
标签：std const string 继承 double 多态 实验 date include

实验任务1

publisher.hpp

#pragma once
#include<iostream>
#include<string>
using std::cout;
using std::string;
using std::endl;
class publisher{
    public:
        publisher(const string &s = " ");
    public:
        virtual    void publish() = 0;
    protected :
        string name;
};
publisher :: publisher(const string &s ) : name{s} { }

class Book:public publisher{
    public :
        Book(const string &s = " ",const string &a = " ");
        void publish() override;
        void read();
    private :
        string author;
};
Book :: Book(const string &s ,const string &a ) : publisher{s} , author{a} { }
void Book :: publish() 
{
    cout << "Publishing book : " << name << " by " << author << endl;
}
void Book :: read()
{
    cout << "Reading book : " << name << " by " << author << endl;
}

class Film : public publisher{
    public :
        Film(const string &s = " ",const string &d = " ");
    public :
        void publish() override;
        void watch();
    private :
        string director;
};
Film :: Film(const string &s,const string &d) : publisher{s} , director{d} {}


void Film ::publish()
{
    cout << "Publishing film : " << name << "directed by " << director << endl;
}
void Film ::watch()
{
    cout << "watching film : " << name << "directed by " << director << endl;
}

class Music : public publisher{
    public :
        Music (const string &s =" ",const string &d = " " );
    public :
        void publish() override;
        void listen();
    private :
        string artist;    
};
Music :: Music(const string &s,const string &d) : publisher {s} , artist{d} {}
void Music::publish() 
{
    cout << "Publishing music : " << name << "by " << artist << endl;
}
void Music::listen()    
{
    cout << "listening to music :" << name << "by " << artist << endl;
}
View Code

task.cpp

#include"publisher.hpp"
#include"vector"
#include<typeinfo>
using std :: vector;

void func(publisher *ptr) 
{
    cout << "Pointer type : " << typeid(ptr).name() << endl;
    cout << "RTTT type :" << typeid(*ptr).name() << endl;
    
    ptr->publish();
}

void test()
{
    publisher *ptr;
    cout << "测试 1 ：\n" ;
    Book book {"Harry potter","J.K.Rowling" };
    ptr = &book;
    func(ptr);
    book.read();
    
    cout << "\n 测试 2 ：\n" ;
    Film film{"The Godfather","Francis Ford Coppola"};
    ptr = &film;
    func(ptr);
    film.watch();
    
    cout << "\n 测试 3 ：\n" ;
    Music music{" Blowing in the wind ", " Bob Dylan"};
    ptr =&music;
    func(ptr);
    music.listen();
    
}
int main()
{
    test();
}
View Code

运行结果：

 实验任务2

 Complex.hpp

#pragma once
#include<iostream>

class Complex{
    public:
        Complex(double r = 0,double i = 0) : real {r} ,imag{i} {}
        Complex(const Complex &c) : real{c.real} ,imag{c.imag} {}
        ~Complex() = default;
    public:
        double get_real() const {return real;}
        double get_imag() const {return imag;}
        
        Complex & operator += ( const Complex &c);
        
        friend Complex operator +(const Complex &c1,const Complex &c2);
        friend bool operator == (const Complex &c1,const Complex &c2);
        
        friend std :: ostream& operator << (std:: ostream& os,const Complex &c);
        friend std :: istream& operator >> (std:: istream & is,Complex &c);
        
    private :
        double real;
        double imag;
};

//成员函数
Complex & Complex :: operator += (const Complex &c)
{
    real += c.real;
    imag += c.imag;
    return *this;
} 

Complex operator+(const Complex &c1, const Complex &c2) {
    return Complex(c1.get_real() + c2.get_real(),
                   c1.get_imag() + c2.get_imag());
}

bool operator==(const Complex &c1, const Complex &c2) {
    return (c1.get_real() == c2.get_real() && c1.get_imag() == c2.get_imag());
}

std::ostream& operator<<(std::ostream &os, const Complex &c) {
    if(c.imag >= 0)
        os << c.real << " + " << c.imag << "i";
    else
        os << c.real << " - " << -c.imag << "i";

    return os;
} 

std::istream& operator>>(std::istream &is, Complex &c) {
    is >> c.real >> c.imag;

    return is;
}
View Code

 

task2.cpp

#include <iostream>
#include "complex.hpp"

void test() {
    using namespace std;

    Complex c1;
    cout << "Enter c1: ";
    cin >> c1;
    cout << "c1 = " << c1 << endl;

    Complex c2{1.5}, c3{1.5, 3}, c4{c3};
    cout << "c2 = " << c2 << endl;
    cout << "c3 = " << c3 << endl;
    cout << "c4 = " << c4 << endl;
    cout << "c3 == c4: " << boolalpha << (c3 == c4) << endl;

    cout << "c1 + c2 = " << c1 + c2 << endl;
    c1 += c2;
    cout << "c1 = " << c1 << endl;
    cout << c1.get_real() << " " << c1.get_imag() << endl;
}

int main() {
    test();
}
View Code

 

运行结果：

 实验任务三

pets.hpp

#include <iostream>
#include <string>
#pragma once
using namespace std;

class MachinePets {
private:
    string nickname;

public:
    MachinePets(const string &s) : nickname{s} {}
    string get_nickname() const { return nickname; }
    virtual string talk() = 0;
};

class PetCats : public MachinePets {
public:
    PetCats(const string &s) : MachinePets{s} {}
    string talk() override {
        return "miao wu~"; 
    }
};

class PetDogs : public MachinePets {
public:
    PetDogs(const string &s) : MachinePets(s) {}
    string talk() override {
        return "wang wang~"; 
    }
};
View Code

 

task3.cpp

#include <iostream>
#include "pets.hpp"

void play(MachinePets &obj) {
    std::cout << obj.get_nickname() << " says " << obj.talk() << std::endl;
}

void test() {
    PetCats cat("miku");
    PetDogs dog("da huang");

    play( cat );
    play( dog );
}

int main() {
    test();
}
View Code

 

运行结果：

 实验任务四

person.hpp

#include <iostream>
#include <string>
#include <vector>
#include <limits>
#pragma once 

using namespace std;

class Person {
private:
    string name;
    string telephone;
    string email;

public:
    Person(const string& n, const string& t, const string& e = "")
        : name{n}, telephone{t}, email{e} {}
    Person() : name(""), telephone(""), email("") {}
    Person(const Person& other) : name{other.name}, telephone{other.telephone}, email{other.email} {}

void update_telephone() {
    cin.clear();
    cout << "输入电话号码：";
    telephone.clear();
    string Newtelephone;
    getline(cin, Newtelephone);
    this->telephone=Newtelephone;
    cout << "电话号码已更新..." << endl;
}

void update_email() {
    cout << "输入email地址：";
 
    email.clear();
    string Newemail ;
    getline(cin, Newemail);
    this->email=Newemail; 
}


    friend ostream& operator<<(ostream& os, const Person& person) {
        os << "Name: " << person.name << "\nTelephone: " << person.telephone << "\nEmail: " << person.email<<endl;
        return os;
    }

    friend istream& operator>>(istream& is, Person& person) {
        getline(is, person.name);
        getline(is, person.telephone);
        getline(is, person.email);
        
        cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
        return is;
    }

    friend bool operator==(const Person& P1, const Person& P2) {
        return (P1.name == P2.name) && (P1.telephone == P2.telephone);
    }
};
View Code

 

task4.cpp

#include<iostream>
#include <iostream>
#include <string>
#include <vector>
#include <limits>
#include"person.hpp"
using namespace std;

void test() {
    vector<Person> phone_book;
    Person p;
    cout << "输入一组联系人的联系方式，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";
    if (phone_book.size() > 1) {
        cout<<phone_book[0]<<phone_book[1];
        cout << boolalpha << (phone_book.at(0) == phone_book.at(1)) << endl;
    }
}

int main() {
    test();
    return 0;
}
View Code

 

运行结果：

 

实验任务五

data.h

#pragma once
class Date{
private:
    int year;
    int month;
    int day;
    int totalDays;
public:
    Date(int year,int month,int day);
    int getYear() const {return year;}
    int getMonth() const {return month;} 
    int getDay() const {return day;}
    int getMaxDay() const;
    bool isLeapYear() const{
        return year%4==0 && year%100 !=0 || year%400==0;
    } 
    void show() const;
    int operator-(const Date& date) const {
        return totalDays-date.totalDays;
    }
};
View Code

 

data.cpp

#include"date.h"
#include<iostream>
#include<cstdlib>
using namespace std;
namespace{
    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();
}
View Code

 

account.h

#pragma once
#include"date.h"
#include"accumulator.h"
#include<string>

class Account{
private:
    std::string id;
    double balance;
    static double total;
protected:
    Account(const Date &date,const std::string &id);
    void record(const Date &date,double amount,const std::string &desc);
    void error(const std::string &msg) const;
public:
    const std::string &getId() const {return id;};
    double getBalance() const {return balance;}
    static double getTotal() {return total;}
    virtual void deposit(const Date &date,double amount,const std::string &desc)=0;
    virtual void withdraw(const Date &date,double amount,const std::string &desc)=0;
    virtual void settle(const Date &date)=0;
    virtual void show() const;
};

class SavingsAccount : public Account{
private:
    Accumulator acc;
    double rate;
public:
    SavingsAccount(const Date &date,const std::string &id,double rate);
    double getRate() const {return rate;}
    void deposit(const Date &date,double amount,const std::string &desc);
    void withdraw(const Date &date,double amount,const std::string &desc);
    void settle (const Date &date);
};

class CreditAccount : public Account{
private:
    Accumulator acc;
    double credit;
    double rate;
    double fee;
    double getDebt() const {
        double balance=getBalance();
        return (balance<0 ? balance : 0);
    }
public:
    CreditAccount(const Date &date,const std::string &id,double credit,double rate,double fee);
    double getCredit() const {return credit;}
    double getRate() const {return rate;}
    double getFee() const {return fee;}
    double getAvailableCredit() const{
        if(getBalance() < 0)
           return credit+getBalance();
        else 
           return credit;
    }
    void deposit(const Date &date,double amount,const std::string &desc);
    void withdraw(const Date &date,double amount,const std::string &desc);
    void settle(const Date &date);
    void show() const;
};
View Code

 

account.cpp

#pragma once
#include"date.h"
#include"accumulator.h"
#include<string>

class Account{
private:
    std::string id;
    double balance;
    static double total;
protected:
    Account(const Date &date,const std::string &id);
    void record(const Date &date,double amount,const std::string &desc);
    void error(const std::string &msg) const;
public:
    const std::string &getId() const {return id;};
    double getBalance() const {return balance;}
    static double getTotal() {return total;}
    virtual void deposit(const Date &date,double amount,const std::string &desc)=0;
    virtual void withdraw(const Date &date,double amount,const std::string &desc)=0;
    virtual void settle(const Date &date)=0;
    virtual void show() const;
};

class SavingsAccount : public Account{
private:
    Accumulator acc;
    double rate;
public:
    SavingsAccount(const Date &date,const std::string &id,double rate);
    double getRate() const {return rate;}
    void deposit(const Date &date,double amount,const std::string &desc);
    void withdraw(const Date &date,double amount,const std::string &desc);
    void settle (const Date &date);
};

class CreditAccount : public Account{
private:
    Accumulator acc;
    double credit;
    double rate;
    double fee;
    double getDebt() const {
        double balance=getBalance();
        return (balance<0 ? balance : 0);
    }
public:
    CreditAccount(const Date &date,const std::string &id,double credit,double rate,double fee);
    double getCredit() const {return credit;}
    double getRate() const {return rate;}
    double getFee() const {return fee;}
    double getAvailableCredit() const{
        if(getBalance() < 0)
           return credit+getBalance();
        else 
           return credit;
    }
    void deposit(const Date &date,double amount,const std::string &desc);
    void withdraw(const Date &date,double amount,const std::string &desc);
    void settle(const Date &date);
    void show() const;
};
View Code

 

task5.cpp

#include"account.h"
#include<iostream>
using namespace std;
int main() {
    Date date(2008,11,1);
    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*);
    cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
    char cmd;
    do {
        date.show();
        cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
        int index,day;
        double amount;
        string desc;
        cin>>cmd;
        switch(cmd) {
        case'd':
            cin >> index >> amount;
            getline(cin,desc);
            accounts[index]->deposit(date,amount,desc);
            break;
        case'w':
            cin >> index >> amount;
            getline(cin,desc);
            accounts[index]->withdraw(date,amount,desc);
            break;
        case's':
            for(int i=0; i<n;i++) {
                cout << "[]"<<i<<"]";
                accounts[i] ->show();
                cout << endl;
            }
            break;
        case'c':
            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':
            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;
}
View Code

 

运行结果：

 

标签：std,const,string,继承,double,多态,实验,date,include
From： https://www.cnblogs.com/202283230013nuister/p/17872867.html

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