Task1.cpp：
1 #include <iostream>
2
3 using std::cout;
4 using std::endl;
5
6 // 类A的定义
7 class A {
8 public:
9 A(int x0, int y0);
10 void display() const;
11
12 private:
13 int x, y;
14 };
15
16 A::A(int x0, int y0): x{x0}, y{y0} {
17 }
18
19 void A::display() const {
20 cout << x << ", " << y << endl;
21 }
22
23 // 类B的定义
24 class B {
25 public:
26 B(double x0, double y0);
27 void display() const;
28
29 private:
30 double x, y;
31 };
32
33 B::B(double x0, double y0): x{x0}, y{y0} {
34 }
35
36 void B::display() const {
37 cout << x << ", " << y << endl;
38 }
39
40 void test() {
41 cout << "测试类A: " << endl;
42 A a(3, 4);
43 a.display();
44
45 cout << "\n测试类B: " << endl;
46 B b(3.2, 5.6);
47 b.display();
48 }
49
50 int main() {
51 test();
52 }
task1_1.cpp
1 #include <iostream>
2 #include <string>
3
4 using std::cout;
5 using std::endl;
6 using std::string;
7
8 // 定义类模板
9 template<typename T>
10 class X{
11 public:
12 X(T x0, T y0);
13 void display();
14
15 private:
16 T x, y;
17 };
18
19 template<typename T>
20 X<T>::X(T x0, T y0): x{x0}, y{y0} {
21 }
22
23 template<typename T>
24 void X<T>::display() {
25 cout << x << ", " << y << endl;
26 }
27
28
29 void test() {
30 cout << "测试1: 类模板X中的抽象类型T用int实例化" << endl;
31 X<int> x1(3, 4);
32 x1.display();
33
34 cout << endl;
35
36 cout << "测试2: 类模板X中的抽象类型T用double实例化" << endl;
37 X<double> x2(3.2, 5.6);
38 x2.display();
39
40 cout << endl;
41
42 cout << "测试3: 类模板X中的抽象类型T用string实例化" << endl;
43 X<string> x3("hello", "oop");
44 x3.display();
45 }
46
47 int main() {
48 test();
49 }
task1_2.cpp
1 #include <complex>
2 #include <vector>
3 #include <array>
4
5 int main() {
6 using namespace std;
7
8 complex<double> x1(5,3); // complex类模板，特化到double类型
9 vector<int> x2{1, 9, 8, 4}; // vector类模板，特化到int类型
10 array<int, 4> x3{1,9, 8, 4}; // array类模板，特化到int类型
11 // 其它略
12 }
task1_3.cpp
运行结果截图：
Task2.cpp:
1 #include "GradeCalc.hpp"
2 #include <iomanip>
3
4 void test() {
5 int n;
6 cout << "输入班级人数: ";
7 cin >> n;
8
9 GradeCalc c1("OOP", n);
10
11 cout << "录入成绩: " << endl;;
12 c1.input();
13 cout << "输出成绩: " << endl;
14 c1.output();
15
16 cout << string(20, '*') + "课程成绩信息" + string(20, '*') << endl;
17 c1.info();
18 }
19
20 int main() {
21 test();
22 }
demon2.cpp
1 #include <iostream>
2 #include <vector>
3 #include <string>
4 #include <algorithm>
5 #include <numeric>
6 #include <iomanip>
7
8 using std::vector;
9 using std::string;
10 using std::cin;
11 using std::cout;
12 using std::endl;
13
14 class GradeCalc: public vector<int> {
15 public:
16 GradeCalc(const string &cname, int size);
17 void input(); // 录入成绩
18 void output() const; // 输出成绩
19 void sort(bool ascending = false); // 排序 (默认降序)
20 int min() const; // 返回最低分
21 int max() const; // 返回最高分
22 float average() const; // 返回平均分
23 void info(); // 输出课程成绩信息
24
25 private:
26 void compute(); // 成绩统计
27
28 private:
29 string course_name; // 课程名
30 int n; // 课程人数
31 vector<int> counts = vector<int>(5, 0); // 保存各分数段人数（[0, 60), [60, 70), [70, 80), [80, 90), [90, 100]
32 vector<double> rates = vector<double>(5, 0); // 保存各分数段比例
33 };
34
35 GradeCalc::GradeCalc(const string &cname, int size): course_name{cname}, n{size} {}
36
37 void GradeCalc::input() {
38 int grade;
39
40 for(int i = 0; i < n; ++i) {
41 cin >> grade;
42 this->push_back(grade);
43 }
44 }
45
46 void GradeCalc::output() const {
47 for(auto ptr = this->begin(); ptr != this->end(); ++ptr)
48 cout << *ptr << " ";
49 cout << endl;
50 }
51
52 void GradeCalc::sort(bool ascending) {
53 if(ascending)
54 std::sort(this->begin(), this->end());
55 else
56 std::sort(this->begin(), this->end(), std::greater<int>());
57 }
58
59 int GradeCalc::min() const {
60 return *std::min_element(this->begin(), this->end());
61 }
62
63 int GradeCalc::max() const {
64 return *std::max_element(this->begin(), this->end());
65 }
66
67 float GradeCalc::average() const {
68 return std::accumulate(this->begin(), this->end(), 0) * 1.0 / n;
69 }
70
71 void GradeCalc::compute() {
72 for(int grade: *this) {
73 if(grade < 60)
74 counts.at(0)++;
75 else if(grade >= 60 && grade < 70)
76 counts.at(1)++;
77 else if(grade >= 70 && grade < 80)
78 counts.at(2)++;
79 else if(grade >= 80 && grade < 90)
80 counts.at(3)++;
81 else if(grade >= 90)
82 counts.at(4)++;
83 }
84
85 for(int i = 0; i < rates.size(); ++i)
86 rates.at(i) = counts.at(i) * 1.0 / n;
87 }
88
89 void GradeCalc::info() {
90 cout << "课程名称:\t" << course_name << endl;
91 cout << "排序后成绩: \t";
92 sort(); output();
93 cout << "最高分:\t" << max() << endl;
94 cout << "最低分:\t" << min() << endl;
95 cout << "平均分:\t" << std::fixed << std::setprecision(2) << average() << endl;
96
97 compute(); // 统计各分数段人数、比例
98
99 vector<string> tmp{"[0, 60) ", "[60, 70)", "[70, 80)","[80, 90)", "[90, 100]"};
100 for(int i = tmp.size()-1; i >= 0; --i)
101 cout << tmp[i] << "\t: " << counts[i] << "人\t"
102 << std::fixed << std::setprecision(2) << rates[i]*100 << "%" << endl;
103 }
GradeCalc.hpp
运行结果截图：
问题1：成绩存储在 GradeCalc 对象内部的 std::vector<int> 中。GradeCalc 类中的方法（如 sort, min, max, average, output）通过 this 指针访问成绩。
input 方法通过调用 this->push_back(grade) 将成绩存储到对象中。这里，push_back 是 std::vector<int> 的成员函数，用于在向量末尾添加一个元素。
问题2：line68分母求出所有学生总分，类型为整型，乘1.0变为浮点型，若去掉1.0，则商为整数，省略了小数部分，不准确。
问题3：GradeCalc 类通过继承 std::vector<int> 获得了存储和操作成绩的功能，但这种设计可能导致代码的可读性和可维护性降低。
Task3.cpp:
1 #include <iostream>
2 #include <vector>
3 #include <string>
4 #include <algorithm>
5 #include <numeric>
6 #include <iomanip>
7
8 using std::vector;
9 using std::string;
10 using std::cin;
11 using std::cout;
12 using std::endl;
13
14 class GradeCalc {
15 public:
16 GradeCalc(const string &cname, int size);
17 void input(); // 录入成绩
18 void output() const; // 输出成绩
19 void sort(bool ascending = false); // 排序 (默认降序)
20 int min() const; // 返回最低分
21 int max() const; // 返回最高分
22 float average() const; // 返回平均分
23 void info(); // 输出课程成绩信息
24
25 private:
26 void compute(); // 成绩统计
27
28 private:
29 string course_name; // 课程名
30 int n; // 课程人数
31 vector<int> grades; // 课程成绩
32 vector<int> counts = vector<int>(5, 0); // 保存各分数段人数（[0, 60), [60, 70), [70, 80), [80, 90), [90, 100]
33 vector<double> rates = vector<double>(5, 0); // 保存各分数段比例
34 };
35
36 GradeCalc::GradeCalc(const string &cname, int size): course_name{cname}, n{size} {}
37
38 void GradeCalc::input() {
39 int grade;
40
41 for(int i = 0; i < n; ++i) {
42 cin >> grade;
43 grades.push_back(grade);
44 }
45 }
46
47 void GradeCalc::output() const {
48 for(int grade: grades)
49 cout << grade << " ";
50 cout << endl;
51 }
52
53 void GradeCalc::sort(bool ascending) {
54 if(ascending)
55 std::sort(grades.begin(), grades.end());
56 else
57 std::sort(grades.begin(), grades.end(), std::greater<int>());
58
59 }
60
61 int GradeCalc::min() const {
62 return *std::min_element(grades.begin(), grades.end());
63 }
64
65 int GradeCalc::max() const {
66 return *std::max_element(grades.begin(), grades.end());
67 }
68
69 float GradeCalc::average() const {
70 return std::accumulate(grades.begin(), grades.end(), 0) * 1.0 / n;
71 }
72
73 void GradeCalc::compute() {
74 for(int grade: grades) {
75 if(grade < 60)
76 counts.at(0)++;
77 else if(grade >= 60 && grade < 70)
78 counts.at(1)++;
79 else if(grade >= 70 && grade < 80)
80 counts.at(2)++;
81 else if(grade >= 80 && grade < 90)
82 counts.at(3)++;
83 else if(grade >= 90)
84 counts.at(4)++;
85 }
86
87 for(int i = 0; i < rates.size(); ++i)
88 rates.at(i) = counts.at(i) *1.0 / n;
89 }
90
91 void GradeCalc::info() {
92 cout << "课程名称:\t" << course_name << endl;
93 cout << "排序后成绩: \t";
94 sort(); output();
95 cout << "最高分:\t" << max() << endl;
96 cout << "最低分:\t" << min() << endl;
97 cout << "平均分:\t" << std::fixed << std::setprecision(2) << average() << endl;
98
99 compute(); // 统计各分数段人数、比例
100
101 vector<string> tmp{"[0, 60) ", "[60, 70)", "[70, 80)","[80, 90)", "[90, 100]"};
102 for(int i = tmp.size()-1; i >= 0; --i)
103 cout << tmp[i] << "\t: " << counts[i] << "人\t"
104 << std::fixed << std::setprecision(2) << rates[i]*100 << "%" << endl;
105 }
GradeCalc.hpp
1 #include "GradeCalc.hpp"
2 #include <iomanip>
3
4 void test() {
5 int n;
6 cout << "输入班级人数: ";
7 cin >> n;
8
9 GradeCalc c1("OOP", n);
10
11 cout << "录入成绩: " << endl;;
12 c1.input();
13 cout << "输出成绩: " << endl;
14 c1.output();
15
16 cout << string(20, '*') + "课程成绩信息" + string(20, '*') << endl;
17 c1.info();
18 }
19
20 int main() {
21 test();
22 }
task3.cpp
运行结果截图：
问题1：通过直接操作 grades 成员变量来访问成绩的。
sort 方法通过 std::sort 算法对 grades 进行排序。
min 和 max 方法分别使用 std::min_element 和 std::max_element 算法来找到 grades 中的最小值和最大值。
average 方法使用 std::accumulate 算法来计算 grades 中所有成绩的总和，然后除以成绩数量 n 来得到平均值。
output 方法则通过遍历 grades 并输出每个成绩来显示所有成绩。
实验任务二中通过this指针访问基类的成员，这里是通过直接操grades成员变量来访问成绩的。
问题2：封装不仅仅是将数据和方法捆绑在一起，更重要的是隐藏实现细节，只暴露必要的接口给外部使用。允许使用基类的引用或指针来调用子类的重写方法
Task4.cpp:
1 #include <iostream>
2 #include <string>
3 #include <limits>
4
5 using namespace std;
6
7 void test1() {
8 string s1, s2;
9 cin >> s1 >> s2; // cin: 从输入流读取字符串, 碰到空白符(空格/回车/Tab)即结束
10 cout << "s1: " << s1 << endl;
11 cout << "s2: " << s2 << endl;
12 }
13
14 void test2() {
15 string s1, s2;
16 getline(cin, s1); // getline(): 从输入流中提取字符串，直到遇到换行符
17 getline(cin, s2);
18 cout << "s1: " << s1 << endl;
19 cout << "s2: " << s2 << endl;
20 }
21
22 void test3() {
23 string s1, s2;
24 getline(cin, s1, ' '); //从输入流中提取字符串，直到遇到指定分隔符
25 getline(cin, s2);
26 cout << "s1: " << s1 << endl;
27 cout << "s2: " << s2 << endl;
28 }
29
30 int main() {
31 cout << "测试1: 使用标准输入流对象cin输入字符串" << endl;
32 test1();
33 cout << endl;
34
35 cin.ignore(numeric_limits<streamsize>::max(), '\n');
36
37 cout << "测试2: 使用函数getline()输入字符串" << endl;
38 test2();
39 cout << endl;
40
41 cout << "测试3: 使用函数getline()输入字符串, 指定字符串分隔符" << endl;
42 test3();
43 }
task4_1.cpp
1 #include <iostream>
2 #include <string>
3 #include <vector>
4 #include <limits>
5
6 using namespace std;
7
8 void output(const vector<string> &v) {
9 for(auto &s: v)
10 cout << s << endl;
11 }
12
13 void test() {
14 int n;
15 while(cout << "Enter n: ", cin >> n) {
16 vector<string> v1;
17
18 for(int i = 0; i < n; ++i) {
19 string s;
20 cin >> s;
21 v1.push_back(s);
22 }
23
24 cout << "output v1: " << endl;
25 output(v1);
26 cout << endl;
27 }
28 }
29
30 int main() {
31 cout << "测试: 使用cin多组输入字符串" << endl;
32 test();
33 }
task4_2.cpp
1 #include <iostream>
2 #include <string>
3 #include <vector>
4 #include <limits>
5
6 using namespace std;
7
8 void output(const vector<string> &v) {
9 for(auto &s: v)
10 cout << s << endl;
11 }
12
13 void test() {
14 int n;
15 while(cout << "Enter n: ", cin >> n) {
16 cin.ignore(numeric_limits<streamsize>::max(), '\n');
17
18 vector<string> v2;
19
20 for(int i = 0; i < n; ++i) {
21 string s;
22 getline(cin, s);
23 v2.push_back(s);
24 }
25 cout << "output v2: " << endl;
26 output(v2);
27 cout << endl;
28 }
29 }
30
31 int main() {
32 cout << "测试: 使用函数getline()多组输入字符串" << endl;
33 test();
34 }
task4_3.cpp
运行结果截图：
Task5.cpp:
1 #define GRM_HPP
2
3 template <typename T>
4 class GameResourceManager {
5 private:
6 T resource;
7
8 public:
9 GameResourceManager(T initial_resource) : resource(initial_resource) {}
10
11 T get() const {
12 return resource;
13 }
14
15 void update(T delta) {
16 resource += delta;
17 if (resource < 0) {
18 resource = 0;
19 }
20 }
21 };
22
23 #endif
grm.hpp
1 #include "grm.hpp"
2 #include <iostream>
3
4 using std::cout;
5 using std::endl;
6
7 void test1() {
8 GameResourceManager<float> HP_manager(99.99);
9 cout << "当前生命值: " << HP_manager.get() << endl;
10 HP_manager.update(9.99);
11 cout << "增加9.99生命值后, 当前生命值: " << HP_manager.get() << endl;
12 HP_manager.update(-999.99);
13 cout << "减少999.99生命值后, 当前生命值: " << HP_manager.get() << endl;
14 }
15
16 void test2() {
17 GameResourceManager<int> Gold_manager(100);
18 cout << "当前金币数量: " << Gold_manager.get() << endl;
19 Gold_manager.update(50);
20 cout << "增加50个金币后, 当前金币数量: " << Gold_manager.get() << endl;
21 Gold_manager.update(-99);
22 cout << "减少99个金币后, 当前金币数量: " << Gold_manager.get() << endl;
23 }
24
25
26 int main() {
27 cout << "测试1: 用float类型对类模板GameResourceManager实例化" << endl;
28 test1();
29 cout << endl;
30
31 cout << "测试2: 用int类型对类模板GameResourceManager实例化" << endl;
32 test2();
33 }
task5.cpp
运行结果截图：
Task6.cpp:
1 #include <iostream>
2 #include <vector>
3 #include <string>
4 #include "info.hpp"
5
6 const int capacity = 100;
7
8 int main() {
9 std::vector<Info> audience_lst;
10 int total_booked = 0,count=0;
11 char choice;
12
13 while (true) {
14 std::string nickname, contact, city;
15 int n;
16 count++;
17 std::cout << "请输入昵称: ";
18 std::getline(std::cin, nickname);
19 std::cout << "请输入联系方式 (email 或手机号): ";
20 std::getline(std::cin, contact);
21 std::cout << "请输入所在城市: ";
22 std::getline(std::cin, city);
23 std::cout << "请输入预定参加人数: ";
24 std::cin >> n;
25
26 std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
27
28
29 if (total_booked+n > capacity) {
30 std::cout << "对不起，只剩"<<capacity-total_booked<<"个位置\n";
31 std::cout << "1、输入u，更新（update）预定信息\n2、输入q退出预定\n";
32 std::cin >> choice;
33 if (choice == 'q') {
34 break;
35 }
36 else if (choice == 'u') {
37 count--;
38 continue;
39 }
40 else {
41 std::cout << "无效选择，请重新输入。\n";
42 continue;
43 }
44 }
45 else if (total_booked+n == capacity) {
46 std::cout << "\n截至目前，一共" << count << "位听众。预约听众信息如下：\n";
47 for (const auto& info : audience_lst) {
48 info.display();
49 std::cout << "\n";
50 }
51 break;
52 }
53 else {
54 audience_lst.emplace_back(nickname, contact, city, n);
55 total_booked += n;
56 std::cout << "预定成功！\n";
57 }
58
59
60 }
61 return 0;
62 }
task6.cpp
1 #pragma once
2 #ifndef INFO_HPP
3 #define INFO_HPP
4
5 #include <string>
6 #include <iostream>
7
8 class Info {
9 private:
10 std::string nickname;
11 std::string contact;
12 std::string city;
13 int n;
14
15 public:
16 Info(const std::string& nick, const std::string& cont, const std::string& cit, int num)
17 : nickname(nick), contact(cont), city(cit), n(num) {}
18
19 void display() const {
20 std::cout << "昵称:" << nickname << " 联系方式: " << contact << " 所在城市: " << city << " 预定参加人数: " << n << "\n";
21 }
22
23 int getAttendees() const {
24 return n;
25 }
26 };
27
28 #endif
info.hpp
运行结果截图：
Task7.cpp:
1 #pragma once
2 #ifndef ACCOUNT_H
3 #define ACCOUNT_H
4
5 #include "date.h"
6 #include "accumulator.h"
7 #include <string>
8
9 class Account {
10 private:
11 std::string id;
12 double balance;
13 static double total;
14
15 protected:
16 Account(const Date& date, const std::string& id);
17 void record(const Date& date, double amount, const std::string& desc);
18 void error(const std::string& msg) const;
19
20 public:
21 const std::string& getId() const { return id; }
22 double getBalance() const { return balance; }
23 static double getTotal() { return total; }
24
25 void show() const;
26 };
27
28 class SavingsAccount : public Account {
29 private:
30 Accumulator acc;
31 double rate;
32
33 public:
34 SavingsAccount(const Date& date, const std::string& id, double rate);
35 double getRate() const { return rate; }
36
37 void deposit(const Date& date, double amount, const std::string& desc);
38 void withdraw(const Date& date, double amount, const std::string& desc);
39 void settle(const Date& date);
40 };
41
42 class CreditAccount : public Account {
43 private:
44 Accumulator acc;
45 double credit;
46 double rate;
47 double fee;
48
49 double getDebt() const {
50 double balance = getBalance();
51 return (balance < 0 ? balance : 0);
52 }
53
54 public:
55 CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee);
56 double getCredit() const { return credit; }
57 double getRate() const { return rate; }
58 double getAvailableCredit() const {
59 if (getBalance() < 0)
60 return credit + getBalance();
61 else
62 return credit;
63 }
64
65 void deposit(const Date& date, double amount, const std::string& desc);
66 void withdraw(const Date& date, double amount, const std::string& desc);
67 void settle(const Date& date);
68 void show() const;
69 };
70
71 #endif // ACCOUNT_H
account.h
1 #pragma once
2 #ifndef ACCOUNT_H
3 #define ACCOUNT_H
4
5 #include "date.h"
6 #include "accumulator.h"
7 #include <string>
8
9 class Account {
10 private:
11 std::string id;
12 double balance;
13 static double total;
14
15 protected:
16 Account(const Date& date, const std::string& id);
17 void record(const Date& date, double amount, const std::string& desc);
18 void error(const std::string& msg) const;
19
20 public:
21 const std::string& getId() const { return id; }
22 double getBalance() const { return balance; }
23 static double getTotal() { return total; }
24
25 void show() const;
26 };
27
28 class SavingsAccount : public Account {
29 private:
30 Accumulator acc;
31 double rate;
32
33 public:
34 SavingsAccount(const Date& date, const std::string& id, double rate);
35 double getRate() const { return rate; }
36
37 void deposit(const Date& date, double amount, const std::string& desc);
38 void withdraw(const Date& date, double amount, const std::string& desc);
39 void settle(const Date& date);
40 };
41
42 class CreditAccount : public Account {
43 private:
44 Accumulator acc;
45 double credit;
46 double rate;
47 double fee;
48
49 double getDebt() const {
50 double balance = getBalance();
51 return (balance < 0 ? balance : 0);
52 }
53
54 public:
55 CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee);
56 double getCredit() const { return credit; }
57 double getRate() const { return rate; }
58 double getAvailableCredit() const {
59 if (getBalance() < 0)
60 return credit + getBalance();
61 else
62 return credit;
63 }
64
65 void deposit(const Date& date, double amount, const std::string& desc);
66 void withdraw(const Date& date, double amount, const std::string& desc);
67 void settle(const Date& date);
68 void show() const;
69 };
70
71 #endif // ACCOUNT_H
accumulator.h
1 #pragma once
2 #ifndef ACCOUNT_H
3 #define ACCOUNT_H
4
5 #include "date.h"
6 #include "accumulator.h"
7 #include <string>
8
9 class Account {
10 private:
11 std::string id;
12 double balance;
13 static double total;
14
15 protected:
16 Account(const Date& date, const std::string& id);
17 void record(const Date& date, double amount, const std::string& desc);
18 void error(const std::string& msg) const;
19
20 public:
21 const std::string& getId() const { return id; }
22 double getBalance() const { return balance; }
23 static double getTotal() { return total; }
24
25 void show() const;
26 };
27
28 class SavingsAccount : public Account {
29 private:
30 Accumulator acc;
31 double rate;
32
33 public:
34 SavingsAccount(const Date& date, const std::string& id, double rate);
35 double getRate() const { return rate; }
36
37 void deposit(const Date& date, double amount, const std::string& desc);
38 void withdraw(const Date& date, double amount, const std::string& desc);
39 void settle(const Date& date);
40 };
41
42 class CreditAccount : public Account {
43 private:
44 Accumulator acc;
45 double credit;
46 double rate;
47 double fee;
48
49 double getDebt() const {
50 double balance = getBalance();
51 return (balance < 0 ? balance : 0);
52 }
53
54 public:
55 CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee);
56 double getCredit() const { return credit; }
57 double getRate() const { return rate; }
58 double getAvailableCredit() const {
59 if (getBalance() < 0)
60 return credit + getBalance();
61 else
62 return credit;
63 }
64
65 void deposit(const Date& date, double amount, const std::string& desc);
66 void withdraw(const Date& date, double amount, const std::string& desc);
67 void settle(const Date& date);
68 void show() const;
69 };
70
71 #endif // ACCOUNT_H
date.h
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.distance(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 }
account.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
26 return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
27 }
28
29 void Date::show() const {
30 cout << getYear() << "-" << getMonth() << "-" << getDay();
31 }
date.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
12 sa1.deposit(Date(2008, 11, 5), 5000, "salary");
13 ca.withdraw(Date(2008, 11, 15), 2000, "buy a cell");
14 sa2.deposit(Date(2008, 11, 25), 10000, "sell stock 0323");
15
16 ca.settle(Date(2008, 12, 1));
17
18 ca.deposit(Date(2008, 12, 1), 2016, "repay the credit");
19 sa1.deposit(Date(2008, 12, 5), 5500, "salary");
20
21 sa1.settle(Date(2009, 1, 1));
22 sa2.settle(Date(2009, 1, 1));
23 ca.settle(Date(2009, 1, 1));
24
25 cout << endl;
26 sa1.show();
27 cout << endl;
28 sa2.show();
29 cout << endl;
30 ca.show();
31 cout << endl;
32 cout << "Total:" << Account::getTotal() << endl;
33 return 0;
34 }
task7.cpp
运行结果截图：
标签：std,const,double,void,实验,date,include From： https://www.cnblogs.com/yuannauy/p/18553005