pets.hpp
1 #ifndef PETS_HPP
2 #define PETS_HPP
3
4 #include <iostream>
5 #include <string>
6
7 class MachinePets {
8 protected:
9 std::string nickname;
10 public:
11 MachinePets(const std::string s) : nickname(s) {}
12 std::string get_nickname() { return nickname; }
13 virtual std::string talk() = 0;
14 };
15
16 class PetCats : public MachinePets {
17 public:
18 PetCats(const std::string s) : MachinePets(s) {}
19 std::string talk() { return "喵喵！"; }
20 };
21
22 class PetDogs : public MachinePets {
23 public:
24 PetDogs(const std::string s) : MachinePets(s) {}
25 std::string talk() { return "旺旺！"; }
26 };
27
28 #endif
View Code
task3.cpp
1 #include <iostream>
2 #include "pets.hpp"
3
4 void play(MachinePets &obj) {
5 std::cout << obj.get_nickname() << " says " << obj.talk() << std::endl;
6 }
7
8 void test() {
9 PetCats cat("miku");
10 PetDogs dog("da huang");
11
12 play( cat );
13 play( dog );
14 }
15
16 int main() {
17 test();
18 }
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运行结果截图
Person.hpp
1 #ifndef PERSON_HPP
2 #define PERSON_HPP
3
4 #include <iostream>
5
6 class Person {
7 private:
8 std::string name;
9 std::string telephone;
10 std::string email;
11 public:
12 Person() = default;
13 Person(const std::string& name, const std::string& telephone, const std::string& email = "")
14 : name(name), telephone(telephone), email(email) {}
15 Person(const Person& other) = default;
16
17 void update_telephone() {
18 std::cout << "请输入新的手机号码: ";
19 std::cin >> telephone;
20 }
21
22 void update_email() {
23 std::cout << "请输入新的邮箱地址: ";
24 std::cin >> email;
25 }
26
27 friend std::ostream& operator<<(std::ostream& os, const Person& p) {
28 os << "姓名: " << p.name << "\t手机号码: " << p.telephone << "\t邮箱: " << p.email;
29 return os;
30 }
31
32 friend std::istream& operator>>(std::istream& is, Person& p) {
33
34 is >> p.name;
35
36 is >> p.telephone;
37
38 is >> p.email;
39 return is;
40 }
41
42 friend bool operator==(const Person& p1, const Person& p2) {
43 return (p1.name == p2.name) && (p1.telephone == p2.telephone);
44 }
45 };
46
47 #endif
View Code
task4.cpp
1 #include <iostream>
2 #include <vector>
3 #include "Person.hpp"
4
5 void test() {
6 using namespace std;
7
8 vector<Person> phone_book;
9 Person p;
10
11 cout << "输入一组联系人的联系方式，E直至按下Ctrl+Z终止\n";
12 while(cin >> p)
13 phone_book.push_back(p);
14
15 cout << "\n更新phone_book中索引为0的联系人的手机号、邮箱:\n";
16 phone_book.at(0).update_telephone();
17 phone_book.at(0).update_email();
18
19 cout << "\n测试两个联系人是否是同一个:\n";
20 cout << boolalpha << (phone_book.at(0) == phone_book.at(1)) << endl;
21 }
22
23 int main() {
24 test();
25 }
View Code
运行结果截图
date.h
1 class Date
2 {
3 private:
4 int year;
5 int month;
6 int day;
7 int totalDays;
8 public:
9 Date(int year, int month, int day);
10 int getYear() const { return year; }
11 int getMonth() const { return month; }
12 int getDay() const { return day; }
13 int getMaxDay() const;
14 bool isLeapYear() const
15 {
16 return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
17 }
18 void show() const;
19 int operator-(const Date& date) const
20 {
21 return totalDays - date.totalDays;
22 }
23 };
View Code
date.cpp
1 #include"date.h"
2 #include<iostream>
3 #include<cstdlib>
4 using namespace std;
5 namespace
6 {
7 const int DAYS_BEFORE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304,334,365 };
8 }
9 Date::Date(int year, int month, int day) :year(year), month(month), day(day)
10 {
11 if (day <= 0 || day > getMaxDay())
12 {
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_BEFORE_MONTH[month - 1] + day;
20 if (isLeapYear() && month > 2) totalDays++;
21 }
22 int Date::getMaxDay() const
23 {
24 if (isLeapYear() && month == 2)
25 return 29;
26 else
27 return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
28 }
29 void Date::show() const
30 {
31 cout << getYear() << "-" << getMonth() << "-" << getDay();
32 }
View Code
accumulator.h
#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; sum = 0;
}
void reset(const Date& date, double value)
{
lastDate = date; this->value = value;
}
};
View Code
account.h
1 #include"date.h"
2 #include"accumulator.h"
3 #include<string>
4 class Account
5 {
6 private:
7 std::string id;
8 double balance;
9 static double total;
10 protected:
11 Account(const Date& date, const std::string& id);
12 void record(const Date& date, double amount, const std::string& desc);
13 void error(const std::string& msg) const;
14 public:
15 const std::string& getId() const { return id; }
16 double getBalance() const { return balance; }
17 static double getToal() { return total; }
18 virtual void deposit(const Date& date, double amount, const std::string& desc) = 0;
19 virtual void withdraw(const Date& date, double amount, const std::string& desc) = 0;
20 virtual void settle(const Date& date);
21 virtual void show() const;
22 };
23 class SavingsAccount :public Account
24 {
25 private:
26 Accumulator acc;
27 double rate;
28 public:
29 SavingsAccount(const Date& date, const std::string& id, double rate);
30 double getRate() const { return rate; }
31 void deposit(const Date& date, double amount, const std::string& desc);
32 void withdraw(const Date& date, double amount, const std::string& desc);
33 void settle(const Date& date);
34 };
35 class CreditAccount :public Account
36 {
37 private:
38 Accumulator acc;
39 double credit;
40 double rate;
41 double fee;
42 double getDebt() const
43 {
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 };
View Code
account.cpp
1 #include"account.h"
2 #include<cmath>
3 #include<iostream>
4 using namespace std;
5 double Account::total = 0;
6 Account::Account(const Date& date, const std::string& id) :id(id), balance(0)
7 {
8 date.show(); cout << "\t#" << id << "created" << endl;
9 }
10 void Account::record(const Date& date, double amount, const string& desc)
11 {
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 {
20 cout << "Error(#" << id << "):" << msg << endl;
21 }
22 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) :Account(date, id), rate(rate), acc(date, 0) {
23 }
24 void SavingsAccount::deposit(const Date& date, double amount, const string& desc)
25 {
26 record(date, amount, desc);
27 acc.change(date, getBalance());
28 }
29 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc)
30 {
31 if (amount > getBalance())
32 {
33 error("not enough money");
34 }
35 else
36 {
37 record(date, -amount, desc);
38 acc.change(date, getBalance());
39 }
40 }
41 void SavingsAccount::settle(const Date& date)
42 {
43 if (date.getMonth() == 1)
44 {
45 double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
46 if (interest != 0) record(date, interest, "interest");
47 acc.reset(date, getBalance());
48 }
49 }
50 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) {
51 }
52 void CreditAccount::deposit(const Date& date, double amount, const string& desc)
53 {
54 record(date, amount, desc);
55 acc.change(date, getDebt());
56 }
57 void CreditAccount::withdraw(const Date& date, double amount, const string& desc)
58 {
59 if (amount - getBalance() > credit)
60 {
61 error("not enough credit");
62 }
63 else
64 {
65 record(date, -amount, desc);
66 acc.change(date, getDebt());
67 }
68 }
69 void CreditAccount::settle(const Date& date)
70 {
71 double interest = acc.getSum(date) * rate;
72 if (interest != 0) record(date, interest, "interest");
73 if (date.getMonth() == 1) record(date, -fee, "annual fee");
74 acc.reset(date, getDebt());
75 }
76 void CreditAccount::show() const
77 {
78 Account::show();
79 cout << "\tAvailable credit:" << getAvailableCredit();
80 }
View Code
8_8.cpp
1 #include"account.h"
2 #include<iostream>
3 using namespace std;
4 int main()
5 {
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::getToal() << "\tcommand";
17 int index, day;
18 double amount; string desc;
19 cin >> cmd;
20 switch (cmd)
21 {
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 {
35 cout << "[" << i << "]";
36 accounts[i]->show();
37 cout << endl;
38 }
39 break;
40 case'c':
41 cin >> day;
42 if (day << date.getDay())
43 cout << "You cannot specify a previous day";
44 else if (day > date.getMaxDay())
45 cout << "Invalid day";
46 else
47 date = Date(date.getYear(), date.getMonth(), day);
48 break;
49 case'n':
50 if (date.getMonth() == 12)
51 date = Date(date.getYear() + 1, 1, 1);
52 else
53 date = Date(date.getYear(), date.getMonth() + 1, 1);
54 for (int i = 0; i < n; i++)
55 accounts[i]->settle(date);
56 break;
57 }
58 } while (cmd != 'e');
59 return 0;
60 }
View Code
运行结果截图
标签：std,const,string,继承,double,多态,Date,实验,date From： https://www.cnblogs.com/chenxiaolong202083290491/p/17873547.html