实验4

实验任务二

代码

GradeCalc.hpp

  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 }

demo2.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 }

编译结果

问题：

问题一:在派生类 GradeCalc 中，成绩直接存储在基类 std::vector<int> 中。

方法 sort 使用 this->begin() 和 this->end() 迭代器访问成绩集合。

方法 min 和 max 调用了 std::min_element 和 std::max_element，同样通过迭代器访问成绩。

方法 average 利用 std::accumulate 遍历成绩集合。

方法 output 使用 this->begin() 和 this->end() 输出成绩。

方法 input 通过 this->push_back(grade) 将用户输入的每个成绩追加到 GradeCalc（即 std::vector<int>）中。

问题二：功能是计算平均值

有影响，用来确保小数部分精度

问题三：没有对成绩校验、只支持单一的成绩管理

实验任务三

代码

GradeCalc.hpp

  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 }

demo3.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 }

编译结果、

问题：

问题一：在 GradeCalc 类中，成绩存储在私有成员变量 grades 中

sort 使用了 grades.begin() 和 grades.end()，调用标准库的 std::sort 对成绩进行排序。

min 和 max 使用了 std::min_element 和 std::max_element，直接在 grades 容器范围内查找最小值和最大值。

average 使用了 std::accumulate 累加成绩总和，并通过班级人数计算平均分。

output 直接遍历 grades 容器，通过迭代输出每一个成绩。

与实验任务 2 的区别

成绩存储方式：实验任务 2 中的 GradeCalc 是继承自 std::vector<int>，成绩直接存储在父类 vector 中(GradeCalc)。

访问方式差异：实验任务 2 的方法直接调用 this->begin() 等接口操作成绩，因为类本身就是一个 vector。

问题二：

实验任务 2：直接继承 std::vector<int>，对外暴露了父类的所有接口（如 push_back 等），破坏了封装性。

实验任务 3：将成绩存储细节隐藏在私有变量 grades 中，通过类方法（如 input、output）控制数据访问，更符合封装原则。

实验任务四

4.1

代码

task4.1

 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 }

编译结果

问题：

作用是清除多余内容

4.2

代码

task4.2

 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 }

编译结果

问题：

4.3

代码

task4.3

 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 }

编译结果

问题：

作用是清空缓存的字符

实验任务五

代码

grm.hpp

 1 #ifndef GRM_HPP
 2 #define GRM_HPP
 3 
 4 template<typename T>
 5 class GameResourceManager {
 6 private:
 7     T resource;
 8 public:
 9     GameResourceManager(T initial) : resource(initial) {}
10 
11     T get() const {
12         return resource;
13     }
14 
15     void update(T change) {
16         resource += change;
17         if (resource < 0) {
18             resource = 0; 
19         }
20     }
21 };
22 
23 #endif

task5.cpp

 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 }

编译结果

实验任务六

代码

info.hpp

 1 #ifndef INFO_HPP
 2 #define INFO_HPP
 3 
 4 #include <iostream>
 5 #include <string>
 6 using std::string;
 7 using std::cout;
 8 using std::endl;
 9 
10 class Info {
11 private:
12     string nickname;  // 昵称
13     string contact;   // 联系方式（邮箱/手机号）
14     string city;      // 所在城市
15     int n;            // 预定参加人数
16 
17 public:
18     // 构造函数
19     Info(const string& nickname, const string& contact, const string& city, int n)
20         : nickname(nickname), contact(contact), city(city), n(n) {}
21 
22     // 获取预定人数
23     int getN() const {
24         return n;
25     }
26 
27     // 更新预定人数
28     void setN(int new_n) {
29         n = new_n;
30     }
31 
32     // 显示用户信息
33     void display() const {
34         cout << "昵称: " << nickname << endl;
35         cout << "联系方式: " << contact << endl;
36         cout << "所在城市: " << city << endl;
37         cout << "预定人数: " << n << endl;
38         cout << "--------------------" << endl;
39     }
40 };
41 
42 #endif // INFO_HPP

task6.cpp

 1 #include "info.hpp"
 2 #include <iostream>
 3 #include <vector>
 4 #include <string>
 5 using std::cin;
 6 using std::cout;
 7 using std::endl;
 8 using std::string;
 9 using std::vector;
10 
11 int main() {
12     const int capacity = 100;  // livehouse最大容量
13     vector<Info> audience_lst; // 存储听众预约信息
14     int total = 0;             // 当前总预约人数
15 
16     cout << "请输入听众预约信息:" << endl;
17 
18     while (true) {
19         string nickname, contact, city;
20         int n;
21 
22         cout << "昵称: ";
23         cin >> nickname;
24         cout << "联系方式: ";
25         cin >> contact;
26         cout << "所在城市: ";
27         cin >> city;
28         cout << "预定参加人数: ";
29         cin >> n;
30 
31         // 检查剩余容量
32         if (total + n > capacity) {
33             cout << "对不起，场地仅剩 " << (capacity - total) << " 个位置。" << endl;
34             cout << "1. 输入 u，更新(update)预定信息" << endl;
35             cout << "2. 输入 q，退出预定" << endl;
36 
37             char choice;
38             cin >> choice;
39 
40             if (choice == 'q') {
41                 continue; // 放弃当前用户
42             } else if (choice == 'u') {
43                 cout << "请重新输入预定信息:" << endl;
44                 cout << "预定参加人数: ";
45                 cin >> n;
46                 if (n + total > capacity) {
47                     cout << "仍超过剩余容量，预约失败。" << endl;
48                     continue;
49                 }
50             }
51         }
52 
53         // 添加听众信息
54         audience_lst.emplace_back(nickname, contact, city, n);
55         total += n;
56 
57         // 检查是否达到容量上限
58         if (total >= capacity) {
59             cout << "预约已满，无法继续预约。" << endl;
60             break;
61         }
62 
63         // 停止录入（Ctrl+Z 或手动条件设计）
64         cout << "是否继续录入？(Ctrl+Z停止)" << endl;
65         if (cin.eof()) break;
66     }
67 
68     // 输出听众预约信息
69     cout << "截至目前，共有 " << total << " 位听众预约。预约听众信息如下:" << endl;
70     cout << "--------------------" << endl;
71     for (const auto& audience : audience_lst) {
72         audience.display();
73     }
74 
75     return 0;
76 }

编译结果

实验任务七

代码

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     } else {
41         record(date, -amount, desc);
42         acc.change(date, getBalance());
43     }
44 }
45 
46 void SavingsAccount::settle(const Date& date) {
47     double interest = acc.getSum(date) * rate / date.distance(Date(date.getYear() - 1, 1, 1));
48     if (interest != 0) record(date, interest, "interest");
49     acc.reset(date, getBalance());
50 }
51 
52 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee)
53     : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {}
54 
55 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
56     record(date, amount, desc);
57     acc.change(date, getDebt());
58 }
59 
60 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
61     if (amount - getBalance() > credit) {
62         error("not enough credit");
63     } else {
64         record(date, -amount, desc);
65         acc.change(date, getDebt());
66     }
67 }
68 
69 void CreditAccount::settle(const Date& date) {
70     double interest = acc.getSum(date) * rate;
71     if (interest != 0) record(date, interest, "interest");
72     if (date.getMonth() == 1) record(date, -fee, "annual fee");
73     acc.reset(date, getDebt());
74 }
75 
76 void CreditAccount::show() const {
77     Account::show();
78     cout << "\tAvailable credit: " << getAvailableCredit();
79 }

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 ACCUMULATOR_H
 3 #define ACCUMULATOR_H
 4 
 5 #include "date.h"
 6 
 7 class Accumulator {
 8 private:
 9     Date lastDate;
10     double value;
11     double sum;
12 
13 public:
14     Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{0} {}
15 
16     double getSum(const Date& date) const {
17         return sum + value * date.distance(lastDate);
18     }
19 
20     void change(const Date& date, double value) {
21         sum = getSum(date);
22         lastDate = date;
23         this->value = value;
24     }
25 
26     void reset(const Date& date, double value) {
27         lastDate = date;
28         this->value = value;
29         sum = 0;
30     }
31 };
32 
33 #endif // ACCUMULATOR_H

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
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.h

 1 #ifndef __DATE_H__
 2 #define __DATE_H__
 3 
 4 class Date {
 5 private:
 6     int year;
 7     int month;
 8     int day;
 9     int totalDays;
10 
11 public:
12     Date(int year, int month, int day);
13     int getYear() const { return year; }
14     int getMonth() const { return month; }
15     int getDay() const { return day; }
16     int getMaxDay() const;
17     bool isLeapYear() const {
18         return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
19     }
20     void show() const;
21     int distance(const Date& date) const {
22         return totalDays - date.totalDays;
23     }
24 };
25 
26 #endif // __DATE_H__

task7.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 }

编译结果

posted @ 2024-11-24 16:59 starming 阅读(12) 评论(0) 编辑收藏举报

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