1.实验任务三
pets.hpp
1 #pragma once
2 #include<iostream>
3 #include<string>
4 using namespace std;
5
6 class MachinePets{
7 public:
8 MachinePets(const string &s="");
9 public:
10 virtual string talk() const=0;
11 string get_nickname() const;
12 protected:
13 string nickname;
14 };
15
16 MachinePets::MachinePets(const string &s):nickname{s}{}
17
18 string MachinePets::get_nickname() const{
19 return nickname;
20 }
21
22 class PetCats:public MachinePets{
23 public:
24 PetCats(const string &s="");
25 string talk() const;
26 };
27
28 PetCats::PetCats(const string &s):MachinePets(s){}
29
30 string PetCats::talk() const{
31 return "miao wu~";
32 }
33
34 class PetDogs:public MachinePets{
35 public:
36 PetDogs(const string &s="");
37 string talk() const;
38 };
39
40 PetDogs::PetDogs(const string &s):MachinePets(s){}
41
42 string PetDogs::talk() const{
43 return "wang wang~";
44 }
task3.cpp
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 }
结果截图：
2.实验任务四
film.hpp
1 #pragma once
2 #include<iostream>
3 #include<string>
4 #include <iomanip>
5 using namespace std;
6
7
8 class Film{
9 public:
10 Film(const string &title="",const string &director="",const string &country="",int year=0);
11
12 friend istream& operator>>(istream &is, Film &f);
13 friend ostream& operator<<(ostream &os, const Film &f);
14
15 int get_year() const {return year;}
16 private:
17 string title;
18 string director;
19 string country;
20 int year;
21 };
22
23 Film::Film(const string &title,const string &director,const string &country,int year){
24 this->title=title;
25 this->director=director;
26 this->country=country;
27 this->year=year;
28 }
29
30 istream& operator>>(istream &is, Film &f){
31 cout << "录入片名:" ;
32 is.ignore();
33 getline(is, f.title);
34 cout << "录入导演: ";
35 getline(is, f.director);
36 cout << "录入制片国家/地区: ";
37 getline(is, f.country);
38 cout << "录入上映年份: ";
39 is >> f.year;
40 return is;
41 }
42
43 ostream& operator<<(ostream &os, const Film &f){
44 os << left;
45 os << setw(15) << f.title
46 << setw(15) << f.director
47 << setw(15) << f.country
48 << setw(15) << f.year ;
49 return os;
50 }
51
52 bool compare_by_year(const Film &f1,const Film &f2){
53 return f1.get_year()<f2.get_year();
54 }
task4.cpp
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 }
结果截图：
3.实验任务五
Complex.hpp
1 #pragma once
2 #include<iostream>
3 #include<string>
4 using namespace std;
5
6 template<typename T>
7 class Complex{
8 private:
9 T real;
10 T imag;
11 public:
12 Complex(T r=0,T i=0):real(r),imag(i) {}
13 Complex(const Complex<T>& other):real(other.real),imag(other.imag){}
14
15 T get_real() const{return real;}
16 T get_imag() const{return imag;}
17
18 Complex<T> &operator+=(const Complex<T>& other){
19 real+=other.real;
20 imag+=other.imag;
21 return *this;
22 }
23
24 Complex<T> operator+(const Complex<T>& other) const{
25 return Complex<T>(real+other.real,imag+other.imag);
26 }
27
28 bool operator==(const Complex<T>&other) const{
29 return real==other.real&&imag==other.imag;
30 }
31
32 friend istream& operator>>(istream &is,Complex<T>& c){
33 is>>c.real>>c.imag;
34 return is;
35 }
36
37 friend ostream& operator<<(ostream& os,const Complex<T>& c){
38 if (c.imag >= 0) {
39 os<<c.real<<"+"<<c.imag<<"i";
40 } else {
41 os<<c.real<<c.imag<<"i";
42 }
43 return os;
44 }
45 };
task5.cpp
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 }
结果截图：
4.实验任务六
date.h
1 #pragma once
2
3 class Date {
4 private:
5 int year;
6 int month;
7 int day;
8 int totalDays;
9
10 public:
11 Date(int year, int month, int day);
12 int getYear() const { return year; }
13 int getMonth() const { return month; }
14 int getDay() const { return day; }
15 int getMaxDay() const;
16 bool isLeapYear() const {
17 return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
18 }
19 void show() const;
20 int operator-(const Date& date) const {
21 return totalDays - date.totalDays;
22 }
23 };
date.cpp
1 #include "date.h"
2 #include <iostream>
3 #include <cstdlib>
4 using namespace std;
5
6 namespace {
7 const int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
8 }
9
10 Date::Date(int year, int month, int day) : year(year), month(month), day(day) {
11 if (day <= 0 || day > getMaxDay()) {
12 cout << "Invalid date: ";
13 show();
14 cout << endl;
15 exit(1);
16 }
17 int years = year - 1;
18 totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
19 if (isLeapYear() && month > 2) totalDays++;
20 }
21
22 int Date::getMaxDay() const {
23 if (isLeapYear() && month == 2)
24 return 29;
25 else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
26 }
27
28 void Date::show() const {
29 cout << getYear() << "-" << getMonth() << "-" << getDay();
30 }
accumulator.h
1 #pragma once
2 #include "date.h"
3
4 class Accumulator {
5 private:
6 Date lastDate;
7 double value;
8 double sum;
9
10 public:
11 Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{ 0 } {}
12
13 double getSum(const Date& date) const {
14 return sum + value * (date - lastDate);
15 }
16
17 void change(const Date& date, double value) {
18 sum = getSum(date);
19 lastDate = date;
20 this->value = value;
21 }
22
23 void reset(const Date& date, double value) {
24 lastDate = date;
25 this->value = value;
26 sum = 0;
27 }
28 };
account.h
1 #pragma once
2 #include "date.h"
3 #include "accumulator.h"
4 #include <string>
5 using namespace std;
6
7 class Account {
8 private:
9 string id;
10 double balance;
11 static double total;
12 protected:
13 Account(const Date& date, const string& id);
14 void record(const Date& date, double amount, const string& desc);
15 void error(const string& msg) const;
16 public:
17 const string& getId() { return id; }
18 double getBalance() const { return balance; }
19 static double getTotal() { return total; }
20 virtual void deposit(const Date& date, double amount, const string& desc) = 0;
21 virtual void withdraw(const Date& date, double amount, const string& desc) = 0;
22 virtual void settle(const Date& date) = 0;
23 virtual void show() const;
24 };
25
26 class SavingsAccount : public Account {
27 private:
28 Accumulator acc;
29 double rate;
30 public:
31 SavingsAccount(const Date& date, const string& id, double rate);
32 double getRate() const { return rate; }
33 void deposit(const Date& date, double amount, const string& desc);
34 void withdraw(const Date& date, double amount, const string& desc);
35 void settle(const Date& date);
36 };
37
38 class CreditAccount : public Account {
39 private:
40 Accumulator acc;
41 double credit;
42 double rate;
43 double fee;
44 double getDebt() const {
45 double balance = getBalance();
46 return (balance < 0 ? balance : 0);
47 }
48 public:
49 CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
50 double getCredit() const { return credit; }
51 double getRate() const { return rate; }
52 double getFee() const { return fee; }
53 double getAvailableCredit() const {
54 if (getBalance() < 0) return credit + getBalance();
55 else return credit;
56 }
57 void deposit(const Date& date, double amount, const string& desc);
58 void withdraw(const Date& date, double amount, const string& desc);
59 void settle(const Date& date);
60 void show() const;
61 };
account.cpp
1 #include "account.h"
2 #include <cmath>
3 #include<iostream>
4 using namespace std;
5
6 double Account::total = 0;
7
8 Account::Account(const Date& date, const string& id) : id(id), balance(0) {
9 date.show();
10 cout << "\t#" << id << " created" << endl;
11 }
12
13 void Account::record(const Date& date, double amount, const string& desc) {
14 amount = floor(amount * 100 + 0.5) / 100;
15 balance += amount;
16 total += amount;
17 date.show();
18 cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
19 }
20
21 void Account::show() const {
22 cout << id << "\tBalance: " << balance;
23 }
24
25 void Account::error(const string& msg) const {
26 cout << "Error (#" << id << "): " << msg << endl;
27 }
28
29 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate)
30 : Account(date, id), rate(rate), acc(date, 0) {}
31
32 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
33 record(date, amount, desc);
34 acc.change(date, getBalance());
35 }
36
37 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
38 if (amount > getBalance()) {
39 error("not enough money");
40 }
41 else {
42 record(date, -amount, desc);
43 acc.change(date, getBalance());
44 }
45 }
46
47 void SavingsAccount::settle(const Date& date) {
48 double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
49 if (interest != 0) record(date, interest, "interest");
50 acc.reset(date, getBalance());
51 }
52
53 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
54 : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {}
55
56 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
57 record(date, amount, desc);
58 acc.change(date, getDebt());
59 }
60
61 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
62 if (amount - getBalance() > credit) {
63 error("not enough credit");
64 }
65 else {
66 record(date, -amount, desc);
67 acc.change(date, getDebt());
68 }
69 }
70
71 void CreditAccount::settle(const Date& date) {
72 double interest = acc.getSum(date) * rate;
73 if (interest != 0) record(date, interest, "interest");
74 if (date.getMonth() == 1) record(date, -fee, "annual fee");
75 acc.reset(date, getDebt());
76 }
77
78 void CreditAccount::show() const {
79 Account::show();
80 cout << "\tAvailable credit: " << getAvailableCredit();
81 }
task6.cpp
1 #include "account.h"
2 #include<iostream>
3 using namespace std;
4
5 int main() {
6 Date date(2008, 11, 1);
7 SavingsAccount sa1(date, "S3755217", 0.015);
8 SavingsAccount sa2(date, "02342342", 0.015);
9 CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
10 Account* accounts[] = { &sa1, &sa2, &ca };
11 const int n = sizeof(accounts) / sizeof(Account*);
12 cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
13 char cmd;
14 do {
15 date.show();
16 cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
17 int index, day;
18 double amount;
19 string desc;
20 cin >> cmd;
21 switch (cmd) {
22 case 'd':
23 cin >> index >> amount;
24 getline(cin, desc);
25 accounts[index]->deposit(date, amount, desc);
26 break;
27 case 'w':
28 cin >> index >> amount;
29 getline(cin, desc);
30 accounts[index]->withdraw(date, amount, desc);
31 break;
32 case 's':
33 for (int i = 0; i < n; i++) {
34 cout << "[" << i << "]";
35 accounts[i]->show();
36 cout << endl;
37 }
38 break;
39 case 'c':
40 cin >> day;
41 if (day < date.getDay()) {
42 cout << "You cannot specify a previous day";
43 }
44 else if (day > date.getMaxDay())
45 cout << "Invalid day";
46 else date = Date(date.getYear(), date.getMonth(), day);
47 break;
48 case 'n':
49 if (date.getMonth() == 12)
50 date = Date(date.getYear() + 1, 1, 1);
51 else date = Date(date.getYear(), date.getMonth() + 1, 1);
52 for (int i = 0; i < n; i++) {
53 accounts[i]->settle(date);
54 }
55 break;
56 }
57 } while (cmd != 'e');
58 return 0;
59 }
结果截图：
基类账户中增添虚函数的声明，方便统一操作。
标签：const,string,继承,double,多态,Date,实验,date,include From： https://www.cnblogs.com/lbldmx/p/18582706