实验任务3
pets.hpp源码
1 #include <iostream>
2 using std::string;
3 class MachinePets {
4 private:
5 string nickname;
6 public:
7 MachinePets(const string s);
8 string get_nickname() const;
9 virtual string talk() = 0;
10 };
11 MachinePets::MachinePets(const string s) : nickname{s} {}
12 string MachinePets::get_nickname() const {return nickname;};
13 class PetCats : public MachinePets {
14 public:
15 PetCats(const string s);
16 string talk() override;
17 };
18 PetCats::PetCats(const string s) : MachinePets{s} {}
19 string PetCats::talk() {
20 return "miao wu~";
21 }
22 class PetDogs : public MachinePets {
23 public:
24 PetDogs(const string s);
25 string talk() override;
26 };
27 PetDogs::PetDogs(const string s) : MachinePets{s} {}
28 string PetDogs::talk() {
29 return "wang wang~";
30 }
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task3.cpp源码
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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实验任务4
Person.hpp源码
task4.cpp源码
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实验任务5
date.h源码
1 #ifndef __DATE_H__
2 #define __DATE_H__
3
4 class Date { //日期类
5 private:
6 int year; //年
7 int month; //月
8 int day; //日
9 int totalDays; //该日期是从公元元年1月1日开始的第几天
10
11 public:
12 Date(int year, int month, int day); //用年、月、日构造日期
13 int getYear() const { return year; }
14 int getMonth() const { return month; }
15 int getDay() const { return day; }
16 int getMaxDay() const; //获得当月有多少天
17 bool isLeapYear() const { //判断当年是否为闰年
18 return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
19 }
20 void show() const; //输出当前日期
21 //计算两个日期之间差多少天
22 int operator - (const Date& date) const {
23 return totalDays - date.totalDays;
24 }
25 };
26
27 #endif //__DATE_H__
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date.cpp源码
1 #include "date.h"
2 #include <iostream>
3 #include <cstdlib>
4 using namespace std;
5
6 namespace { //namespace使下面的定义只在当前文件中有效
7 //存储平年中某个月1日之前有多少天，为便于getMaxDay函数的实现，该数组多出一项
8 const int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
9 }
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
20 + DAYS_BEFORE_MONTH[month - 1] + day;
21 if (isLeapYear() && month > 2) totalDays++;
22 }
23
24 int Date::getMaxDay() const {
25 if (isLeapYear() && month == 2)
26 return 29;
27 else
28 return DAYS_BEFORE_MONTH[month]- DAYS_BEFORE_MONTH[month - 1];
29 }
30
31 void Date::show() const {
32 cout << getYear() << "-" << getMonth() << "-" << getDay();
33 }
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accumulator.h源码
1 #ifndef __ACCUMULATOR_H__
2 #define __ACCUMULATOR_H__
3 #include "date.h"
4
5 class Accumulator { //将某个数值按日累加
6 private:
7 Date lastDate; //上次变更数值的时期
8 double value; //数值的当前值
9 double sum; //数值按日累加之和
10 public:
11 //构造函数，date为开始累加的日期，value为初始值
12 Accumulator(const Date &date, double value)
13 : lastDate(date), value(value), sum(0) { }
14
15 //获得到日期date的累加结果
16 double getSum(const Date &date) const {
17 return sum + value * (date - lastDate);
18 }
19
20 //在date将数值变更为value
21 void change(const Date &date, double value) {
22 sum = getSum(date);
23 lastDate = date;
24 this->value = value;
25 }
26
27 //初始化，将日期变为date，数值变为value，累加器清零
28 void reset(const Date &date, double value) {
29 lastDate = date;
30 this->value = value;
31 sum = 0;
32 }
33 };
34
35 #endif //__ACCUMULATOR_H__
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account.h源码
1 #ifndef __ACCOUNT_H__
2 #define __ACCOUNT_H__
3 #include "date.h"
4 #include "accumulator.h"
5 #include <string>
6
7 class Account { //账户类
8 private:
9 std::string id; //帐号
10 double balance; //余额
11 static double total; //所有账户的总金额
12 protected:
13 //供派生类调用的构造函数，id为账户
14 Account(const Date &date, const std::string &id);
15 //记录一笔帐，date为日期，amount为金额，desc为说明
16 void record(const Date &date, double amount, const std::string &desc);
17 //报告错误信息
18 void error(const std::string &msg) const;
19 public:
20 const std::string &getId() const { return id; }
21 double getBalance() const { return balance; }
22 static double getTotal() { return total; }
23 //存入现金，date为日期，amount为金额，desc为款项说明
24 virtual void deposit(const Date &date, double amount, const std::string &desc) = 0;
25 //取出现金，date为日期，amount为金额，desc为款项说明
26 virtual void withdraw(const Date &date, double amount, const std::string &desc) = 0;
27 //结算（计算利息、年费等），每月结算一次，date为结算日期
28 virtual void settle(const Date &date) = 0;
29 //显示账户信息
30 virtual void show() const;
31 };
32
33 class SavingsAccount : public Account { //储蓄账户类
34 private:
35 Accumulator acc; //辅助计算利息的累加器
36 double rate; //存款的年利率
37 public:
38 //构造函数
39 SavingsAccount(const Date &date, const std::string &id, double rate);
40 double getRate() const { return rate; }
41 virtual void deposit(const Date &date, double amount, const std::string &desc);
42 virtual void withdraw(const Date &date, double amount, const std::string &desc);
43 virtual void settle(const Date &date);
44 };
45
46 class CreditAccount : public Account { //信用账户类
47 private:
48 Accumulator acc; //辅助计算利息的累加器
49 double credit; //信用额度
50 double rate; //欠款的日利率
51 double fee; //信用卡年费
52
53 double getDebt() const { //获得欠款额
54 double balance = getBalance();
55 return (balance < 0 ? balance : 0);
56 }
57 public:
58 //构造函数
59 CreditAccount(const Date &date, const std::string &id, double credit, double rate, double fee);
60 double getCredit() const { return credit; }
61 double getRate() const { return rate; }
62 double getFee() const { return fee; }
63 double getAvailableCredit() const { //获得可用信用
64 if (getBalance() < 0)
65 return credit + getBalance();
66 else
67 return credit;
68 }
69 virtual void deposit(const Date &date, double amount, const std::string &desc);
70 virtual void withdraw(const Date &date, double amount, const std::string &desc);
71 virtual void settle(const Date &date);
72 virtual void show() const;
73 };
74
75 #endif //__ACCOUNT_H__
View Code
account.cpp源码
1 #include "account.h"
2 #include <cmath>
3 #include <iostream>
4 using namespace std;
5
6 double Account::total = 0;
7
8 //Account类的实现
9 Account::Account(const Date &date, const string &id)
10 : id(id), balance(0) {
11 date.show();
12 cout << "\t#" << id << " created" << endl;
13 }
14
15 void Account::record(const Date &date, double amount, const string &desc) {
16 amount = floor(amount * 100 + 0.5) / 100; //保留小数点后两位
17 balance += amount;
18 total += amount;
19 date.show();
20 cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
21 }
22
23 void Account::show() const {
24 cout << id << "\tBalance: " << balance;
25 }
26
27 void Account::error(const string &msg) const {
28 cout << "Error(#" << id << "): " << msg << endl;
29 }
30
31 //SavingsAccount类相关成员函数的实现
32 SavingsAccount::SavingsAccount(const Date &date, const string &id, double rate)
33 : Account(date, id), rate(rate), acc(date, 0) { }
34
35 void SavingsAccount::deposit(const Date &date, double amount, const string &desc) {
36 record(date, amount, desc);
37 acc.change(date, getBalance());
38 }
39
40 void SavingsAccount::withdraw(const Date &date, double amount, const string &desc) {
41 if (amount > getBalance()) {
42 error("not enough money");
43 } else {
44 record(date, -amount, desc);
45 acc.change(date, getBalance());
46 }
47 }
48
49 void SavingsAccount::settle(const Date &date) {
50 if (date.getMonth() == 1) { //每年的一月计算一次利息
51 double interest = acc.getSum(date) * rate
52 / (date - Date(date.getYear() - 1, 1, 1));
53 if (interest != 0)
54 record(date, interest, "interest");
55 acc.reset(date, getBalance());
56 }
57 }
58
59 //CreditAccount类相关成员函数的实现
60 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
61 : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) { }
62
63 void CreditAccount::deposit(const Date &date, double amount, const string &desc) {
64 record(date, amount, desc);
65 acc.change(date, getDebt());
66 }
67
68 void CreditAccount::withdraw(const Date &date, double amount, const string &desc) {
69 if (amount - getBalance() > credit) {
70 error("not enough credit");
71 } else {
72 record(date, -amount, desc);
73 acc.change(date, getDebt());
74 }
75 }
76
77 void CreditAccount::settle(const Date &date) {
78 double interest = acc.getSum(date) * rate;
79 if (interest != 0)
80 record(date, interest, "interest");
81 if (date.getMonth() == 1)
82 record(date, -fee, "annual fee");
83 acc.reset(date, getDebt());
84 }
85
86 void CreditAccount::show() const {
87 Account::show();
88 cout << "\tAvailable credit:" << getAvailableCredit();
89 }
View Code
8_8.cpp源码
1 #include "account.h"
2 #include <iostream>
3 using namespace std;
4
5 int main() {
6 Date date(2008, 11, 1); //起始日期
7 //建立几个账户
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*); //账户总数
13
14 cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
15 char cmd;
16 do {
17 //显示日期和总金额
18 date.show();
19 cout << "\tTotal: " << Account::getTotal() << "\tcommand> ";
20
21 int index, day;
22 double amount;
23 string desc;
24
25 cin >> cmd;
26 switch (cmd) {
27 case 'd': //存入现金
28 cin >> index >> amount;
29 getline(cin, desc);
30 accounts[index]->deposit(date, amount, desc);
31 break;
32 case 'w': //取出现金
33 cin >> index >> amount;
34 getline(cin, desc);
35 accounts[index]->withdraw(date, amount, desc);
36 break;
37 case 's': //查询各账户信息
38 for (int i = 0; i < n; i++) {
39 cout << "[" << i << "] ";
40 accounts[i]->show();
41 cout << endl;
42 }
43 break;
44 case 'c': //改变日期
45 cin >> day;
46 if (day < date.getDay())
47 cout << "You cannot specify a previous day";
48 else if (day > date.getMaxDay())
49 cout << "Invalid day";
50 else
51 date = Date(date.getYear(), date.getMonth(), day);
52 break;
53 case 'n': //进入下个月
54 if (date.getMonth() == 12)
55 date = Date(date.getYear() + 1, 1, 1);
56 else
57 date = Date(date.getYear(), date.getMonth() + 1, 1);
58 for (int i = 0; i < n; i++)
59 accounts[i]->settle(date);
60 break;
61 }
62 } while (cmd != 'e');
63 return 0;
64 }
View Code
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From： https://www.cnblogs.com/ffhfAdjFH7Vr/p/17869309.html