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实验5 继承和多态

时间：2023-12-03 21:56:48浏览次数：31  
标签：const string 继承 double 多态 Date 实验 date include

实验任务3

pets.hpp

 

#pragma once

#include<iostream>
#include<string>

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() {
        return "miao";
    }
};

class PetDogs:public MachinePets {
public:
    PetDogs(const string s):MachinePets{s} {}
    string talk() {
        return "wang";
    }
};

 

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();
}

 

 

 

实验任务4

Person.hpp

 

#pragma once

#include<iostream>
#include<string>
#include<iomanip>
#include<limits>

using namespace std;

class Person {
private:
    string name;
    string telephone;
    string email;
public:
    Person();
    Person(const string &n,const string &t,const string &e);
    Person(const Person &p);
    void update_telephone();
    void update_email();
    friend ostream &operator << (ostream &os, Person &p);
    friend istream &operator >> (istream &is, Person &p);
    friend bool operator == (const Person &b1, const Person &b2);
};

Person::Person() {}
Person::Person(const string &n,const string &t,const string &e):name{n},telephone{t},email{e} {}
Person::Person(const Person &p) {
    this->name = p.name;
    this->telephone = p.telephone;
    this->email = p.email;
} 
void Person::update_telephone() {
    cin.clear();
    string new_telephone;
    cout << "输入电话号码：" ;
    getline(cin,new_telephone);
    telephone = new_telephone;
    cout << "电话号码已更新..." << endl;
}

void Person::update_email() {
    cin.clear();
    string new_email;
    cout << "请输入email地址：";
    getline(cin,new_email);
    email = new_email;
    cout << "email地址已更新..." << endl;
}

ostream &operator << (ostream &os,Person &p) {
    os << p.name << endl << p.telephone << endl << p.email << endl;
    return os;
}

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

bool operator == (const Person &b1,const Person &b2) {
    return ((b1.name == b2.name) && (b1.telephone == b2.telephone));
}

 

task4.cpp

 

#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();
}

 

 

 

实验任务5

date.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;
    }
};

date.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();
}

accumulator.h

#pragma once
#include"date.h"
class Accumulator{
private:
    Date lastDate;
    double value;
    double sum;
public:
    Accumulator(const Date &date,double value)
       :lastDate(date),value(value),sum(0) {}
    double getSum(const Date &date) const {
        return sum+value*(date-lastDate);
    }
    void change (const Date &date,double value) {
        sum=getSum(date);
        lastDate=date;this->value=value;
    }
    void reset(const Date &date,double value) {
        lastDate=date;this->value=value;sum=0;
    }
};

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;
};

account.cpp

#include "account.h"
#include <cmath>
#include <iostream>
using namespace std;
double Account::total=0;

Account::Account(const Date &date,const 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();
}

8_8.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;
}

 

 

标签：const,string,继承,double,多态,Date,实验,date,include
From： https://www.cnblogs.com/yzsya/p/17871017.html

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