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实验5

时间：2023-12-03 22:33:39浏览次数：26  
标签：std const string double Date 实验 date

实验任务3

 1 #pragma once
 2 #include <string>
 3 #include <iostream>
 4 
 5 class MachinePets {
 6 public:
 7     MachinePets(const std::string& s);
 8     virtual ~MachinePets() = default;
 9 
10     const std::string& get_nickname() const;
11 
12     virtual std::string talk() const = 0;
13 
14 protected:
15     std::string nickname;
16 };
17 
18 class PetCats : public MachinePets {
19 public:
20     PetCats(const std::string& s);
21     ~PetCats() override = default;
22 
23     std::string talk() const override;
24 };
25 
26 class PetDogs : public MachinePets {
27 public:
28     PetDogs(const std::string& s);
29     ~PetDogs() override = default;
30 
31     std::string talk() const override;
32 };
33 
34 MachinePets::MachinePets(const std::string& s) : nickname(s) {}
35 
36 const std::string& MachinePets::get_nickname() const {
37     return nickname;
38 }
39 
40 PetCats::PetCats(const std::string& s) : MachinePets(s) {}
41 
42 std::string PetCats::talk() const {
43     return "miao wu~";
44 }
45 
46 PetDogs::PetDogs(const std::string& s) : MachinePets(s) {}
47 
48 std::string PetDogs::talk() const {
49     return "wang wang~";
50 }
pets.hpp 
 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 }
task3.cpp

实验任务4

 1 #pragma once
 2 #include <iostream>
 3 #include <string>
 4 
 5 class Person {
 6 public:
 7     Person();
 8     Person(const std::string& name, const std::string& telephone, const std::string& email = "");
 9 
10 
11     Person(const Person& other);
12 
13 
14     void update_telephone();
15     void update_email();
16 
17     friend std::ostream& operator<<(std::ostream& os, const Person& p);
18     friend std::istream& operator>>(std::istream& is, Person& p);
19     friend bool operator==(const Person& p1, const Person& p2);
20 
21 private:
22     std::string name;
23     std::string telephone;
24     std::string email;
25 };
26 
27 Person::Person() : name(""), telephone(""), email("") {}
28 
29 Person::Person(const std::string& name, const std::string& telephone, const std::string& email)
30     : name(name), telephone(telephone), email(email) {}
31 
32 Person::Person(const Person& other) : name(other.name), telephone(other.telephone), email(other.email) {}
33 
34 void Person::update_telephone() {
35     std::cout << "Enter new telephone number: ";
36     std::cin >> telephone;
37 }
38 
39 void Person::update_email() {
40     std::cout << "Enter new email address: ";
41     std::cin >> email;
42 }
43 
44 std::ostream& operator<<(std::ostream& os, const Person& p) {
45     os << "Name: " << p.name << "\nTelephone: " << p.telephone << "\nEmail: " << p.email << "\n";
46     return os;
47 }
48 
49 std::istream& operator>>(std::istream& is, Person& p) {
50     std::cout << "Enter name: ";
51     is >> p.name;
52     std::cout << "Enter telephone number: ";
53     is >> p.telephone;
54     std::cout << "Enter email address: ";
55     is >> p.email;
56     return is;
57 }
58 
59 bool operator==(const Person& p1, const Person& p2) {
60     return (p1.name == p2.name) && (p1.telephone == p2.telephone);
61 }
person.hpp 
 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     cout << "\n更新phone_book中索引为0的联系人的手机号、邮箱:\n";
12     phone_book.at(0).update_telephone();
13     phone_book.at(0).update_email();
14     cout << "\n测试两个联系人是否是同一个:\n";
15     cout << boolalpha << (phone_book.at(0) == phone_book.at(1)) << endl;
16 }
17 int main() {
18     test();
19 }
task4.cpp

实验任务5

 1 #pragma once
 2 #include<iostream>
 3 class Date {
 4 private:
 5     int year;
 6     int month;
 7     int day;
 8     int totalDays;
 9 public:
10     Date(int year, int month, int day);
11     int getYear() const { return year; }
12     int getMonth() const { return month; }
13     int getDay() const { return day; }
14     int getMaxDay() const;
15     bool isLeapYear() const {
16         return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
17     }
18     void show() const;
19     int operator-(const Date& date)const {
20         return totalDays - date.totalDays;
21     }
22 };
date.h 
 1 #include"date.h"
 2 #include<iostream>
 3 #include<cstdlib>
 4 using namespace std;
 5 namespace{
 6     const int DAYS_BEFORE_MONTH[] = {0,31,59,90,120,151,181,212,243,273,304,334,365};
 7 }
 8 Date::Date(int year,int month,int day) : year(year),month(month),day(day) {
 9     if(day <= 0 || day > getMaxDay()) {
10         cout << "Invalid date:";
11         show();
12         cout << endl;
13         exit(1);
14     }
15     int years=year-1;
16     totalDays=years*365+years/4-years/100+years/400+DAYS_BEFORE_MONTH[month-1]+day;
17     if(isLeapYear() && month>2) totalDays++; 
18 }
19 int Date::getMaxDay() const {
20     if(isLeapYear() && month==2)
21        return 29;
22     else
23        return DAYS_BEFORE_MONTH[month]-DAYS_BEFORE_MONTH[month-1];
24 }
25 void Date::show() const{
26     cout << getYear() << "-" << getMonth() << "-" <<getDay();
27 }
date.cpp 
 1 #pragma once
 2 #include"date.h"
 3 class Accumulator{
 4 private:
 5     Date lastDate;
 6     double value;
 7     double sum;
 8 public:
 9     Accumulator(const Date &date,double value)
10        :lastDate(date),value(value),sum(0) {}
11     double getSum(const Date &date) const {
12         return sum+value*(date-lastDate);
13     }
14     void change (const Date &date,double value) {
15         sum=getSum(date);
16         lastDate=date;this->value=value;
17     }
18     void reset(const Date &date,double value) {
19         lastDate=date;this->value=value;sum=0;
20     }
21 };
accumulator.h 
 1 #pragma once
 2 #include"date.h"
 3 #include"accumulator.h"
 4 #include<string>
 5 
 6 class Account{
 7 private:
 8     std::string id;
 9     double balance;
10     static double total;
11 protected:
12     Account(const Date &date,const std::string &id);
13     void record(const Date &date,double amount,const std::string &desc);
14     void error(const std::string &msg) const;
15 public:
16     const std::string &getId() const {return id;};
17     double getBalance() const {return balance;}
18     static double getTotal() {return total;}
19     virtual void deposit(const Date &date,double amount,const std::string &desc)=0;
20     virtual void withdraw(const Date &date,double amount,const std::string &desc)=0;
21     virtual void settle(const Date &date)=0;
22     virtual void show() const;
23 };
24 
25 class SavingsAccount : public Account{
26 private:
27     Accumulator acc;
28     double rate;
29 public:
30     SavingsAccount(const Date &date,const std::string &id,double rate);
31     double getRate() const {return rate;}
32     void deposit(const Date &date,double amount,const std::string &desc);
33     void withdraw(const Date &date,double amount,const std::string &desc);
34     void settle (const Date &date);
35 };
36 
37 class CreditAccount : public Account{
38 private:
39     Accumulator acc;
40     double credit;
41     double rate;
42     double fee;
43     double getDebt() const {
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 "account.h"
 2 #include <cmath>
 3 #include <iostream>
 4 using namespace std;
 5 double Account::total=0;
 6 
 7 Account::Account(const Date &date,const string &id)
 8         :id(id),balance(0) {
 9         date.show();cout << "\t#" << id << "created" << endl;
10 }
11 void Account::record(const Date &date,double amount,const string &desc) {
12     amount=floor(amount * 100+0.5)/100;
13     balance+=amount;total+=amount;
14     date.show();
15     cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
16 } 
17 void Account::show() const {cout << id << "\tBalance:" << balance;}
18 void Account::error(const string &msg) const {
19     cout << "Error( #"<<id<<"):"<< msg << endl;
20 }
21 
22 SavingsAccount::SavingsAccount(const Date &date,const string &id,double rate)
23     :Account(date,id),rate(rate),acc(date,0) {}
24 void SavingsAccount::deposit(const Date &date,double amount,const string &desc) {
25     record(date,amount,desc);
26     acc.change(date,getBalance());
27 }
28 void SavingsAccount::withdraw(const Date &date,double amount,const string &desc) {
29     if(amount>getBalance()) {
30         error("not enough money");
31     }else {
32         record(date,-amount,desc);
33         acc.change(date,getBalance());
34     }
35 }
36 void SavingsAccount::settle(const Date &date) {
37     if(date.getMonth()==1) {
38         double interest=acc.getSum(date) * rate
39             /(date-Date(date.getYear()-1,1,1));
40         if(interest !=0)
41            record(date,interest,"interest");
42         acc.reset(date,getBalance());
43     }
44 }
45 
46 CreditAccount::CreditAccount(const Date& date,const string& id,double credit, double rate, double fee) 
47     :Account(date,id),credit(credit),rate(rate),fee(fee),acc(date,0) {}
48 void CreditAccount::deposit(const Date &date,double amount, const string &desc) {
49     record(date,amount,desc);
50     acc.change(date,getDebt());
51 }
52 void CreditAccount::withdraw(const Date &date,double amount,const string &desc) {
53     if(amount-getBalance()>credit) {
54         error("not enough credit");
55     }else{
56         record(date,-amount,desc);
57         acc.change(date,getDebt());
58     }
59 }
60 void CreditAccount::settle(const Date &date) {
61     double interest=acc.getSum(date)*rate;
62     if(interest !=0) record (date,interest,"interest");
63     if(date.getMonth()==1)
64        record(date,-fee,"annual fee");
65     acc.reset(date,getDebt());
66 }
67 void CreditAccount::show() const {
68     Account::show();
69     cout << "\tAvailable credit:" << getAvailableCredit();
70 }
account.cpp 
 1 #include"account.h"
 2 #include<iostream>
 3 using namespace std;
 4 int main() {
 5     Date date(2008,11,1);
 6     SavingsAccount sa1(date,"S3755217",0.015);
 7     SavingsAccount sa2(date,"02342342",0.015);
 8     CreditAccount ca(date,"C5392394",10000,0.0005,50);
 9     Account * accounts[]={&sa1,&sa2,&ca};
10     const int n=sizeof(accounts)/sizeof(Account*);
11     cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
12     char cmd;
13     do {
14         date.show();
15         cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
16         int index,day;
17         double amount;
18         string desc;
19         cin>>cmd;
20         switch(cmd) {
21         case'd':
22             cin >> index >> amount;
23             getline(cin,desc);
24             accounts[index]->deposit(date,amount,desc);
25             break;
26         case'w':
27             cin >> index >> amount;
28             getline(cin,desc);
29             accounts[index]->withdraw(date,amount,desc);
30             break;
31         case's':
32             for(int i=0; i<n;i++) {
33                 cout << "[]"<<i<<"]";
34                 accounts[i] ->show();
35                 cout << endl;
36             }
37             break;
38         case'c':
39             cin>>day;
40             if(day < date.getDay())
41                cout << "You cannot specify a previous day";
42             else if (day > date.getMaxDay())
43                cout << "Invalid day";
44             else
45                date=Date(date.getYear(),date.getMonth(),day);
46             break;
47         case'n':
48             if(date.getMonth()==12)
49                date=Date(date.getYear()+1,1,1);
50             else
51                date=Date(date.getYear(),date.getMonth()+1,1);
52             for(int i = 0;i<n;i++)
53                 accounts[i]->settle(date);
54             break;
55         }
56     }while(cmd !='e');
57     return 0;
58 }
8_8.cpp

 

标签：std,const,string,double,Date,实验,date
From： https://www.cnblogs.com/ZJY1203/p/17873938.html

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