实验5

task3:

 1 #pragma
 2 
 3 #include<iostream>
 4 #include<string>
 5 
 6 using namespace std;
 7 
 8 class MachinePets{
 9     public:
10         MachinePets(const string &s="");
11     public:
12         string get_nickname()const;
13         virtual string talk()const=0;
14     protected:
15         string nickname;
16 };
17 
18 MachinePets::MachinePets(const string &s):nickname{s}{
19 }
20 
21 string MachinePets::get_nickname()const{
22     return nickname;
23 }
24 
25 class PetCats:public MachinePets{
26     public:
27         PetCats(const string &s="",const string &c="miao wu~");
28     public:    
29         string talk()const override;
30     private:
31         string cry;
32 };
33 
34 PetCats::PetCats(const string &s,const string &c):MachinePets{s},cry{c}{
35 }
36 
37 string PetCats::talk()const{
38     return cry;
39 }
40 
41 class PetDogs:public MachinePets{
42     public:
43         PetDogs(const string &s="",const string &c="wang wang~");
44     public:
45         string talk()const override;
46     private:
47         string cry;
48 };
49 
50 PetDogs::PetDogs(const string &s,const string &c):MachinePets{s},cry{c}{
51 }
52 
53 string PetDogs::talk()const{
54     return cry; 
55 }

pets.hpp

 1 #include <iostream>
 2 #include <vector>
 3 #include "pets.hpp"
 4 
 5 void test() {
 6     using namespace std;
 7 
 8     vector<MachinePets *> pets;
 9 
10     pets.push_back(new PetCats("miku"));
11     pets.push_back(new PetDogs("da huang"));
12 
13     for(auto &ptr: pets)
14         cout <<ptr->get_nickname() << " says " << ptr->talk() << endl;
15 }
16 
17 int main() {
18     test();
19 }

task3.cpp

task4:

 1 #pragma once
 2 
 3 #include<iostream>
 4 #include<string>
 5 #include<iomanip>
 6 
 7 using namespace std;
 8 
 9 class Film{
10     public:
11         Film();
12         Film(const string &name,const string &director,const string &area,const string &year);
13         friend istream& operator>>(istream& in,Film &film);
14         friend ostream& operator<<(ostream& out,const Film &film);
15         friend bool compare_by_year(const Film &f1,const Film &f2);
16     private:
17         string name;
18         string director;
19         string area;
20         string year;
21 };
22 
23 Film::Film(){
24 }
25 
26 Film::Film(const string &name,const string &director,const string &area,const string &year){
27     this->name=name;
28     this->director=director;
29     this->area=area;
30     this->year=year;
31 }
32 
33 istream& operator>>(istream& in,Film &film){
34     cout<<"录入片名：";
35     in>>film.name;
36     cout<<"录入导演：";
37     in>>film.director;
38     cout<<"录入制片国家/地区：";
39     in>>film.area;
40     cout<<"录入上映年份：";
41     in>>film.year;
42     return in;
43 }
44 
45 ostream& operator<<(ostream& out,const Film &film){
46     out<<left;
47     out<<setw(15)<<film.name<<setw(15)<<film.director<<setw(15)<<film.area<<setw(15)<<film.year<<endl;
48     return out;
49 }
50 
51 bool compare_by_year(const Film& f1,const Film& f2){
52     return f1.year<f2.year;
53 }

film.hpp

 1 #include "film.hpp"
 2 #include <iostream>
 3 #include <string>
 4 #include <vector>
 5 #include <algorithm>
 6 
 7 void test() {
 8     using namespace std;
 9     
10     int n;
11     cout << "输入电影数目: ";
12     cin >> n;
13 
14     cout << "录入" << n << "部影片信息" << endl;
15     vector<Film> film_lst;
16     for(int i = 0; i < n; ++i) {
17         Film f;
18         cout << string(20, '-') << "第" << i+1 << "部影片录入" << string(20, '-') << endl;
19         cin >> f;
20         film_lst.push_back(f);
21     }
22 
23     // 按发行年份升序排序
24     sort(film_lst.begin(), film_lst.end(), compare_by_year);
25 
26     cout << string(20, '=') + "电影信息(按发行年份)" +  string(20, '=')<< endl;
27     for(auto &f: film_lst)
28         cout << f << endl;
29 }
30 
31 int main() {
32     test();
33 }

task4.cpp

task5:

 1 #pragma once
 2 
 3 #include<iostream>
 4 
 5 using namespace std;
 6 
 7 template<typename T>
 8 class Complex{
 9     public:
10         Complex(T r=0,T i=0);
11         
12         T get_real()const;
13         T get_imag()const;
14         
15         template<typename U>
16         friend Complex<U>& operator+=(Complex<U> &c1,const Complex<U> &c2);
17         template<typename U> 
18         friend Complex<U> operator+(const Complex<U> &c1,const Complex<U> &c2);
19         template<typename U>
20         friend bool operator==(const Complex<U> &c1,const Complex<U> &c2);
21         template<typename U>
22         friend ostream& operator<<(ostream &out,const Complex<U> &c);
23         template<typename U>
24         friend istream& operator>>(istream &in,Complex<U> &c);
25     private:
26         T real,imag;
27 };
28 
29 template<typename T>
30 Complex<T>::Complex(T r,T i):real{r},imag{i}{
31 }
32 
33 template<typename T>
34 T Complex<T>::get_real()const{
35     return real;
36 }
37 
38 template<typename T>
39 T Complex<T>::get_imag()const{
40     return imag;
41 }
42 
43 template<typename T>
44 Complex<T>& operator+=(Complex<T> &c1, const Complex<T> &c2) {
45     c1.real += c2.real;
46     c1.imag += c2.imag;
47 
48     return c1;
49 }
50 
51 template<typename T>
52 Complex<T> operator+(const Complex<T> &c1,const Complex<T> &c2){
53     return Complex<T>(c1.real+c2.real,c1.imag+c2.imag);
54 }
55 
56 template<typename T>
57 bool operator==(const Complex<T> &c1,const Complex<T> &c2){
58     if(c1.real==c2.real&&c1.imag==c2.imag)
59     return true;
60     else
61     return false;
62 }
63 
64 template<typename T>
65 ostream& operator<<(ostream &out,const Complex<T> &c){
66     if(c.imag>=0)
67     out<<c.real<<" + "<<c.imag<<"i";
68     else
69     out<<c.real<<" - "<<-c.imag<<"i";
70     
71     return out;
72 }
73 
74 template<typename T>
75 istream& operator>>(istream &in,Complex<T> &c){
76     in>>c.real>>c.imag;
77     
78     return in;
79 }

Complex.hpp

 1 #include "Complex.hpp"
 2 #include <iostream>
 3 
 4 using std::cin;
 5 using std::cout;
 6 using std::endl;
 7 using std::boolalpha;
 8 
 9 void test1() {
10     Complex<int> c1(2, -5), c2(c1);
11 
12     cout << "c1 = " << c1 << endl;
13     cout << "c2 = " << c2 << endl;
14     cout << "c1 + c2 = " << c1 + c2 << endl;
15     
16     c1 += c2;
17     cout << "c1 = " << c1 << endl;
18     cout << boolalpha << (c1 == c2) << endl;
19 }
20 
21 void test2() {
22     Complex<double> c1, c2;
23     cout << "Enter c1 and c2: ";
24     cin >> c1 >> c2;
25     cout << "c1 = " << c1 << endl;
26     cout << "c2 = " << c2 << endl;
27 
28     cout << "c1.real = " << c1.get_real() << endl;
29     cout << "c1.imag = " << c1.get_imag() << endl;
30 }
31 
32 int main() {
33     cout << "自定义类模板Complex测试1: " << endl;
34     test1();
35 
36     cout << endl;
37 
38     cout << "自定义类模板Complex测试2: " << endl;
39     test2();
40 }

task5.cpp

task6:

 1 #pragma once
 2 
 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 {
12             return year;
13         }
14         int getMonth()const {
15             return month;
16         }
17         int getDay()const {
18             return day;
19         }
20         int getMaxDay()const;
21         bool isLeapYear()const {
22             return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
23         }
24         void show()const;
25         int operator-(const Date& date)const {
26             return totalDays - date.totalDays;
27         }
28 };

date.h

 1 #include"date.h"
 2 #include<iostream>
 3 #include<cstdlib>
 4 
 5 
 6 using namespace std;
 7 
 8 namespace {
 9     const int DAYS_BEFIRE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304 ,334,365 };
10 }
11 Date::Date(int year, int month, int day) :year(year), month(month), day(day) {
12     if (day <= 0 || day > getMaxDay()) {
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_BEFIRE_MONTH[month - 1] + day;
20     if (isLeapYear() && month > 2) totalDays++;
21 }
22 int Date::getMaxDay()const {
23     if (isLeapYear() && month == 2)
24         return 29;
25     else return DAYS_BEFIRE_MONTH[month] - DAYS_BEFIRE_MONTH[month - 1];
26 }
27 void Date::show()const {
28     cout << getYear() << "-" << getMonth() << "-" << getDay();
29 }

date.cpp

 1 #pragma once
 2 
 3 #include"date.h"
 4 
 5 class Accumulator {
 6     private:
 7         Date lastDate;
 8         double value;
 9         double sum;
10     public:
11         Accumulator(const Date& date, double value) :lastDate(date), value(value), sum { 0 } {}
12         double getSum(const Date& date) const {
13             return sum + value * (date - lastDate);
14         }
15         void change(const Date& date, double value) {
16             sum = getSum(date);
17             lastDate = date;
18             this->value = value;
19         }
20         void reset(const Date& date, double value) {
21             lastDate = date;
22             this->value;
23             sum = 0;
24         }
25 };

Accumulator.h

 1 #pragma once
 2 
 3 #include"date.h"
 4 #include"accumulator.h"
 5 #include<string>
 6 
 7 using namespace std;
 8 
 9 class Account {
10     private:
11         string id;
12         double balance;
13         static double total;
14     protected:
15         Account(const Date& date, const string &id);
16         void record(const Date& date, double amoount, const string& desc);
17         void error(const string& msg) const;
18     public:
19         const string& getId() {
20             return id;
21         }
22         double getBalance()const {
23             return balance;
24         }
25         static double getTotal() {
26             return total;
27         }
28         virtual void deposit(const Date& date, double amount, const string& desc) = 0;
29         virtual void withdraw(const Date& date, double amount, const string& desc) = 0;
30         virtual void settle(const Date& date) = 0;
31         virtual void show()const;
32 };
33 class SavingsAccount :public Account {
34     private:
35         Accumulator acc;
36         double rate;
37     public:
38         SavingsAccount(const Date& date, const string& id, double rate);
39         double getRate() const {
40             return  rate;
41         }
42         void deposit(const Date& date, double amount, const string& desc);
43         void withdraw(const Date& date, double amount, const string& desc);
44         void settle(const Date& date);
45 };
46 class CreditAccount :public Account {
47     private:
48         Accumulator acc;
49         double credit;
50         double rate;
51         double fee;
52         double getDebt()const {
53             double balance = getBalance();
54             return(balance < 0 ? balance : 0);
55         }
56     public:
57         CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
58         double getCredit()const {
59             return credit;
60         }
61         double getRate()const {
62             return rate;
63         }
64         double getFee() const {
65             return fee;
66         }
67         double getAvailableCredit()const {
68             if (getBalance() < 0)return credit + getBalance();
69             else return credit;
70         }
71         void deposit(const Date& date, double amount, const string& desc);
72         void withdraw(const Date& date, double amount, const string& desc);
73         void settle(const Date& date);
74         void show()const;
75 };

account.h

 1 #include "account.h"
 2 #include <cmath>
 3 #include<iostream>
 4 
 5 using namespace std;
 6 
 7 double Account::total = 0;
 8 Account::Account(const Date& date, const string& id) :id(id), balance(0) {
 9     date.show();
10     cout << "\t#" << id << "created" << endl;
11 }
12 void Account::record(const Date& date, double amount, const string& desc) {
13     amount = floor(amount * 100 + 0.5) / 100;
14     balance += amount;
15     total += amount;
16     date.show();
17     cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
18 }
19 void Account::show()const {
20     cout << id << "\tBalance:" << balance;
21 }
22 void Account::error(const string& msg)const {
23     cout << "Error(#" << id << "):" << msg << endl;
24 }
25 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) :Account(date, id), rate(rate), acc(date, 0) {}
26 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
27     record(date, amount, desc);
28     acc.change(date, getBalance());
29 }
30 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
31     if (amount > getBalance()) {
32         error("not enough money");
33     } else {
34         record(date, -amount, desc);
35         acc.change(date, getBalance());
36     }
37 }
38 void SavingsAccount::settle(const Date& date) {
39     double interest = acc.getSum(date) * rate / (date-Date(date.getYear() - 1, 1, 1));
40     if (interest != 0)record(date, interest, "interest");
41     acc.reset(date, getBalance());
42 }
43 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) {}
44 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
45     record(date, amount, desc);
46     acc.change(date, getDebt());
47 }
48 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
49     if (amount - getBalance() > credit) {
50         error("not enouogh credit");
51     } else {
52         record(date, -amount, desc);
53         acc.change(date, getDebt());
54     }
55 }
56 void CreditAccount::settle(const Date& date) {
57     double interest = acc.getSum(date) * rate;
58     if (interest != 0) record(date, interest, "interest");
59     if (date.getMonth() == 1)record(date, -fee, "annual fee");
60     acc.reset(date, getDebt());
61 }
62 void CreditAccount::show()const {
63     Account::show();
64     cout << "\tAvailable credit:" << getAvailableCredit();
65 }

account.cpp

 1 #include"account.h"
 2 #include<iostream> 
 3 
 4 using namespace std;
 5 
 6 int main() {
 7     Date date(2008, 11, 1);
 8     SavingsAccount sa1(date, "S3755217", 0.015);
 9     SavingsAccount sa2(date, "02342342", 0.015);
10     CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
11     Account* accounts[] = { &sa1,&sa2,&ca };
12     const int n = sizeof(accounts) / sizeof(Account*);
13     cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
14     char cmd;
15     do {
16         date.show();
17         cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
18         int index, day;
19         double amount;
20         string desc;
21         cin >> cmd;
22         switch (cmd) {
23             case 'd':
24                 cin >> index >> amount;
25                 getline(cin, desc);
26                 accounts[index]->deposit(date, amount, desc);
27                 break;
28 
29             case 'w':
30                 cin >> index >> amount;
31                 getline(cin, desc);
32                 accounts[index]->withdraw(date, amount, desc);
33                 break;
34             case 's':
35                 for (int i = 0; i < n; i++) {
36                     cout << "[" << i << "]";
37                     accounts[i]->show();
38                     cout << endl;
39                 }
40                 break;
41 
42             case 'c':
43                 cin >> day;
44                 if (day < date.getDay()) {
45                     cout << "You cannot specify a previous day";
46                 }             else if (day > date.getMaxDay())
47                     cout << "Invalid day";
48                 else date = Date(date.getYear(), date.getMonth(), day);
49                 break;
50             case 'n':
51                 if (date.getMonth() == 12)
52                     date = Date(date.getYear() + 1, 1, 1);
53                 else date = Date(date.getYear(), date.getMonth() + 1, 1);
54                 for (int i = 0; i < n; i++) {
55                     accounts[i]->settle(date);
56                 }
57                 break;
58         }
59     } while (cmd != 'e');
60     return 0;
61 }

task6.cpp

在基类Account中将账户的公共操作皆声明为虚函数，通过基类的指针来执行各种操作，各类型的账户对象都可以通过一个基类指针的数组来访问，提供了极大的便利，使得我们可以通过统一方式来操作各个账户，从cin输入所需执行的操作就变得非常方便。

posted @ 2024-12-02 22:36 _mao 阅读(8) 评论(0) 编辑收藏举报

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实验5

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