实验4 类的组合、继承、模板类、标准库
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 };
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 }
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
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
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
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 }
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 }
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 }
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