实验任务二
源码：
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
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 }
task2.cpp
运行结果：
问题1：派生类GradeCalc定义中，成绩存储在哪里？派生类方法sort, min, max, average, output都要访问成绩，是通过什么接口访问到每个成绩的？input方法是通过什么接口实现数据存入对象的？
答：成绩存储在GradeCalc对象内部的std::vector<int>中。GradeCalc类的方法（如sort, min, max, average, output）通过this指针访问成绩。由于这些方法是在GradeCalc类的上下文中定义的，它们可以直接调用std::vector<int>的成员函数或使用范围for循环等操作来访问和操作存储的成绩。input方法通过调用std::vector<int>的push_back成员函数将数据存入对象。
问题2：代码line68分母的功能是？去掉乘以1.0代码，重新编译、运行，结果有影响吗？为什么要乘以1.0？
答：line68求平均值；去掉后平均值只保留整数部分，*1.0是为了把int转化为float便于计算
问题3：从真实应用场景角度考虑，GradeCalc类在设计及代码实现细节上，有哪些地方尚未考虑周全，仍需继续迭代、完善？
答：1.将std::vector<int>作为GradeCalc类的一个私有成员变量，并通过公共接口（如成员函数）来访问和操作这些成绩。这样可以更好地封装数据，并清晰地定义类的职责。
2.input方法目前只是简单地读取用户输入的成绩，并没有进行任何验证。需要在input方法中添加输入验证逻辑，确保输入的成绩是有效的。如果输入无效，可以提示用户重新输入或采取其他适当的措施。
实验任务三
源码：
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：
问题1：组合类GradeCalc定义中，成绩存储在哪里？组合类方法sort, min, max, average, output都要访问成绩，是通过什么接口访问到每个成绩的？观察与实验任务2在代码写法细节上的差别。
答：成绩存储在组合类GradeCalc的public的vector<int> grades中；组合类方法可以直接调用std::vector<int>的成员函数或使用范围for循环等操作来访问和操作存储的成绩
问题2：对比实验任务2和实验任务3，主体代码逻辑（测试代码）没有变更，类GradeCalc的 接口也没变，变化的是类GradeCalc的设计及接口内部实现细节。你对面向对象编程有什么新的理解和领悟吗？
答：私有成员和公共接口的处理
实验任务四
task4.1
源码：
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;
10 cout << "s1:" << s1 << endl;
11 cout << "s2:" << s2 << endl;
12 }
13
14 void test2() {
15 string s1, s2;
16 getline(cin, s1);
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
运行结果：
1.未去line35：
2.去除line35
问题1：去掉task4_1.cpp的line35，重新编译、运行，给出此时运行结果截图。查阅资料，回 答line35在这里的用途是什么？
答：cin.ignore(numeric_limits<streamsize>::max(), '\n'); 这行代码在C++中用于处理输入流，特别是用于忽略（或“跳过”）输入缓冲区中直到下一个换行符（\n）之前的所有字符，最多忽略 numeric_limits<streamsize>::max() 个字符。这里，numeric_limits<streamsize>::max() 是从 <limits> 头文件中定义的 std::numeric_limits 模板类获取的一个常量，表示 streamsize 类型能表示的最大值，通常是一个非常大的数，足以覆盖大多数情况下的输入需求。
这里line36用于清楚输入缓存区（其中还剩个\n）防止影响接下来的输出
task4.2
源码：
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
运行结果：
task4.3
源码：
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
运行结果：
1.去掉line16前：
2.去掉line16后：
问题2：去掉task4_3.cpp的line16，重新编译、运行，给出此时运行结果。查阅资料，回答line16 在这里的用途是什么？
答：in.ignore(numeric_limits<streamsize>::max(), '\n'); 这行代码的作用是忽略输入流（cin）中直到下一个换行符（\n）之前的所有字符，但忽略的字符数量不会超过<中>指定的最大值。
这通常用于处理输入后的残留字符，特别是在读取一行文本（可能包含空格）但之前已经使用了如 cin >> 这样的输入操作读取了其他数据时。
实验任务五
源码：
1 #include<iostream>
2
3 template<typename T>
4 class GameResourceManager {
5 public:
6 GameResourceManager(T rsc);
7 void update(T rsc_update);
8 T get();
9 private:
10 T resource;
11 };
12
13 template <typename T>
14 GameResourceManager<T>::GameResourceManager(T rsc) :resource{ rsc } {}
15
16 template<typename T>
17 void GameResourceManager<T>::update(T rsc_update){
18 resource = resource + rsc_update;
19 if (resource <= 0)
20 resource = 0;
21 }
22
23 template<typename T>
24 T GameResourceManager<T>::get() {
25 return resource;
26 }
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：
实验任务六
源码：
1 #include<iostream>
2 #include<string>
3
4 class info {
5 private:
6 std::string nickname;
7 std::string contact;
8 std::string city;
9 int n;
10
11 public:
12 info(const std::string& nick, const std::string& cont, const std::string& cit, int num)
13 :nickname(nick),contact(cont),city(cit),n(num){}
14
15 //显示信息
16 void display()const {
17 std::cout << "昵称: " << nickname << "\n"
18 << "联系方式: " << contact << "\n"
19 << "所在城市: " << city << "\n"
20 << "预定参加人数: " << n << "\n";
21 }
22
23 //获取预定参观人数
24 int get_n() const {
25 return n;
26 }
27 };
info.hpp
1 // task6.cpp
2 #include <iostream>
3 #include <vector>
4 #include <string>
5 #include "info.hpp"
6
7 const int capacity = 100; // livehouse最大容纳人数
8
9 int main() {
10 std::vector<info> audience_lst; // 用于存储预约信息的vector
11 int total_booked = 0; // 当前已预约总人数
12 std::string nickname, contact, city;
13 int n;
14 char choice;
15
16 while (true) {
17 std::cout << "请输入预约信息:\n";
18 std::cout << "昵称: ";
19 std::cin >> nickname;
20 std::cout << "联系方式 (email/手机号): ";
21 std::cin >> contact;
22 std::cout << "所在城市: ";
23 std::cin >> city;
24 std::cout << "预定参加人数: ";
25 std::cin >> n;
26
27 // 检查是否超过场地容量
28 if (total_booked + n > capacity) {
29 std::cout << "预定人数超过场地容量，请选择:\n";
30 std::cout << "q: 退出预定\n";
31 std::cout << "u: 更新预定信息\n";
32 std::cin >> choice;
33
34 if (choice == 'q') {
35 break;
36 }
37 else if (choice == 'u') {
38 continue; // 回到循环开头重新输入预定信息
39 }
40 else {
41 std::cout << "无效选择，请重新输入.\n";
42 continue; // 无效选择时重新输入
43 }
44 }
45 else {
46 // 添加预约信息到vector中
47 audience_lst.push_back(info(nickname, contact, city, n));
48 total_booked += n;
49 }
50
51 // 可选：输入特定字符（如'e'）退出录入
52 std::cout << "是否继续录入? (e: 退出): ";
53 std::cin >> choice;
54 if (choice == 'e') {
55 break;
56 }
57 }
58
59 // 打印输出预约信息
60 std::cout << "\n预约参加livehouse的听众信息:\n";
61 for (const auto& info : audience_lst) {
62 info.display();
63 std::cout << "\n"; // 每个预约信息后换行
64 }
65
66 return 0;
67 }
task6.cpp
运行结果：
实验任务七：
源码：
1 #pragma once
2 #ifndef ACCOUNT H
3 #define ACCOUNT H
4 #include"date.h"
5 #include"accumulator.h"
6 #include<string>
7 class Account {
8 private:
9 std::string id;
10 double balance;
11 static double total;
12 protected:
13 Account(const Date& date, const std::string& id);
14 void record(const Date& date, double amount, const std::string& desc);
15 void error(const std::string& msg)const;
16 public:
17 const std::string& getId()const { return id; }
18 double getBalance()const { return balance; }
19 static double getTotal() { return total; }
20
21 void show()const;
22 };
23 class SavingsAccount :public Account {
24 private:
25 Accumulator acc;
26 double rate;
27 public:
28 SavingsAccount(const Date& date, const std::string& id, double rate);
29 double getRate()const { return rate; }
30
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 private:
37 Accumulator acc;
38 double credit;
39 double rate;
40 double fee;
41 double getDebt()const {
42 double balance = getBalance();
43 return (balance < 0 ? balance : 0);
44 }
45 public:
46 CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee);
47 double getCredit()const { return credit; }
48 double getRate()const { return rate; }
49 double getAvailableCredit()const {
50 if (getBalance() < 0)
51 return credit + getBalance();
52 else
53 return credit;
54 }
55 void deposit(const Date& date, double amount, const std::string& desc);
56 void withdraw(const Date& date, double amount, const std::string& desc);
57 void settle(const Date& date);
58 void show()const;
59 };
60 #endif//ACCOUNT H
account.h
1 #pragma once
2 #ifndef ACCUMULATOR H
3 #define ACCUMULATOR H
4 #include"date.h"
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 }
13
14 double getSum(const Date& date)const {
15 return sum + value * date.distance(lastDate);
16 }
17
18 void change(const Date& date, double value) {
19 sum = getSum(date);
20 lastDate = date; this->value = value;
21 }
22
23 void reset(const Date& date, double value) {
24 lastDate = date; this->value = value; sum = 0;
25 }
26 };
27 #endif//ACCUMULATOR H
accumulator.h
1 #pragma once
2 #ifndef DATE H
3 #define DATE H
4 class Date {
5 private:
6 int year;
7 int month;
8 int day;
9 int totalDays;
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 distance(const Date& date)const {
21 return totalDays - date.totalDays;
22 }
23 };
24 #endif// DATE H
date.h
1 #include"account.h"
2 #include<cmath>
3 #include<iostream>
4 using namespace std;
5 double Account::total = 0;
6
7 Account::Account(const Date& date, const string& id) :id{ id }, balance{ 0 } {
8 date.show(); cout << "\t#" << id << "created" << endl;
9 }
10
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
20 void Account::show()const { cout << id << "\tBalance:" << balance; }
21 void Account::error(const string& msg)const {
22 cout << "Error(#" << id << "):" << msg << endl;
23 }
24
25 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) :Account(date, id), rate(rate), acc(date, 0) {}
26
27 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
28 record(date, amount, desc);
29 acc.change(date, getBalance());
30 }
31
32 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
33 if (amount > getBalance()) {
34 error("not enough money");
35 }
36 else {
37 record(date, -amount, desc);
38 acc.change(date, getBalance());
39 }
40 }
41
42 void SavingsAccount::settle(const Date& date) {
43 double interest = acc.getSum(date) * rate / date.distance(Date(date.getYear() - 1, 1, 1));
44 if (interest != 0)record(date, interest, "interest");
45 acc.reset(date, getBalance());
46 }
47
48 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) {}
49
50 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
51 record(date, amount, desc);
52 acc.change(date, getDebt());
53 }
54
55 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
56 if (amount - getBalance() > credit) {
57 error("not enough credit");
58 }
59 else {
60 record(date, -amount, desc);
61 acc.change(date, getDebt());
62 }
63 }
64
65 void CreditAccount::settle(const Date& date) {
66 double interest = acc.getSum(date) * rate;
67 if (interest != 0)record(date, interest, "interest");
68 if (date.getMonth() == 1)
69 record(date, -fee, "annual fee");
70 acc.reset(date, getDebt());
71 }
72
73 void CreditAccount::show()const {
74 Account::show();
75 cout << "\tAvailable credit:" << getAvailableCredit();
76 }
account.cpp
1 #include"date.h"
2 #include<iostream>
3 #include<cstdlib>
4 using namespace std;
5 namespace {
6 const int DAYS_BEFORE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304,334,365 };
7 }
8 Date::Date(int year, int month, int day) :year{ year }, month{ month }, day{ day } {
9 if (day <= 0 || day > getMaxDay()) {
10 cout << "Invalid date:";
11 show();
12 cout << endl;
13 exit(1);
14 }
15 int years = year - 1;
16 totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
17 if (isLeapYear() && month > 2)totalDays++;
18 }
19 int Date::getMaxDay()const {
20 if (isLeapYear() && month == 2)
21 return 29;
22 else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
23 }
24
25 void Date::show()const {
26 cout << getYear() << "-" << getMonth() << "-" << getDay();
27 }
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(); cout << endl;
27 sa2.show(); cout << endl;
28 ca.show(); cout << endl;
29 cout << "Total:" << Account::getTotal() << endl;
30 return 0;
31 }
task7.cpp
运行结果：
标签：std,const,组合,继承,void,int,date,include,模板 From： https://www.cnblogs.com/yrx0415/p/18552647