实验四

任务一

task1_1.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 }

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结果截图

task1_2.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 }

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结果截图

任务2

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 }

View Code

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 }

View Code

结果截图

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：成绩是存储在GradeCalc类所继承的 vector<int>类型成员中。this->begin()和 this->end()通过继承自vectot<int>类的接口获得容器的开始和结束迭代器,使用这两个迭代器可以访问成绩。input是通过this->push_back(grade),来将成绩存入内部容器。

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：除以人数求平均值。有影响，使得平均分为double类型。

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：当前的input方法是通过命令行逐个读取成绩，适用于简单的应用场景，但在更复杂的应用场景中，可能需要从文件或其他数据源读取成绩。

可以将输入方法设计为接收一个文件。

任务三

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 }

View Code

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 }

View Code

结果截图

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：存储在grades数组中。通过访问类的私有成员数组grades。它们通过成员函数的隐式this指针来访问类的成员变量。

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：通过继承和多态等机制，我们可以轻松地扩展现有类的功能或创建新的类来满足新的需求。

任务四

task4_1.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 }

View Code

结果截图

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：忽略输入流中的多余字符，直到遇到换行符'\n'结束。确保后续输入流不受前面换行符影响。

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         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 }

View Code

结果截图

task4_3.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 }

View Code

结果截图

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：忽略输入流中的多余字符，直到遇到换行符'\n'结束。确保后续输入流不受前面换行符影响。

任务五

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 }

View Code

grm.hpp

 1 #pragma once
 2 #include <iostream>
 3 template<typename T>
 4 class GameResourceManager{
 5     public:
 6         GameResourceManager(T x);
 7         T get();
 8         void update(T others);
 9     private:
10         T resource;
11     
12 };
13 
14 template<typename T>
15 GameResourceManager<T>::GameResourceManager(T x) : resource(x) {}
16 
17 template<typename T>
18 T GameResourceManager<T>::get() {
19     return resource;
20 }
21 
22 template<typename T>
23 void GameResourceManager<T>::update(T others) {
24     resource+=others;
25     if(resource<0)
26         resource=0;
27 }

View Code

结果截图

任务六

info.hpp

 1 #pragma once
 2 #include <iostream>
 3 #include<string>
 4 #include <iomanip>
 5 using namespace std;
 6 using std::cout;
 7 using std::endl;
 8 using std::string; 
 9 class Info{
10     public:
11         Info(string name,string x,string c,int y);
12         void display();
13     private:
14         string nickname;
15         string contact;
16         string city;
17         int n;
18 };
19 
20 Info::Info(string name,string x,string c,int y) : nickname(name),contact(x),city(c),n(y) {}
21 
22 void Info::display() {
23     cout<<setw(10)<<"昵称："<<nickname<<endl;
24     cout<<setw(10)<<"联系方式："<<contact<<endl;
25     cout<<setw(10)<<"所在城市："<<city<<endl;
26     cout<<setw(10)<<"预定人数："<<n<<endl;
27 }

View Code

task6.cpp

 1 #include "info.hpp"
 2 #include <iostream>
 3 #include<vector>
 4 #include <limits>
 5 using std::vector;
 6 using std::cout;
 7 using std::endl;
 8 using std::string;
 9 
10 int main() {
11     const int capacity=100;
12     vector<Info> audience_Ist;
13     string s1,s2,s3;
14     int m,count=0; 
15     char message; 
16     cout << "录入用户预约信息：" << endl;
17     cout<<endl; 
18     while(cout << left,cout <<setw(8)<<"昵称" << setw(30) << "联系方式（邮箱、手机号）" << setw(15) << "所在城市" << setw(15) << "预定参加人数"<<endl,cin >> s1 >> s2 >> s3 >> m)
19     {
20         if(count+m>capacity)
21         {
22             cout<<"对不起，只剩下"<<capacity-count<<"个座位。"<<endl;
23             cout<<"1.输入u，更新（update）预定信息"<<endl;
24             cout<<"2.输入q，推出预定"<<endl;
25             cout<<"你的选择：";
26             cin>>message;
27             if(message=='u') {
28                 cout<<"请重新输入预定信息："<<endl;
29                 continue;
30             }
31             else if(message=='q')
32                 break;
33         }
34         else if(count+m==capacity)
35         {
36             count=capacity;
37             Info c(s1,s2,s3,m);
38             audience_Ist.push_back(c);
39             break;
40         }
41         else
42             count+=m;
43         Info c(s1,s2,s3,m);
44         audience_Ist.push_back(c);
45     }
46     cout<<endl;
47     cout<<"截至目前，一共有"<<count<<"位听众预约。预约听众信息如下："<<endl;
48     for (int i=0;i<audience_Ist.size();++i) {
49         cout<<"-----------------------------"<<endl; 
50         audience_Ist[i].display();
51     }
52 }

View Code

结果截图

任务七

date.h

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

View Code

accmulator.h

 1 #pragma once
 2 #include "date.h"
 3 class Accumulator {
 4 private:
 5     Date lastDate;
 6     double value;
 7     double sum;
 8 public:
 9     Accumulator(const Date&date,double value):lastDate(date),value(value),sum{0}{}
10     double getSum(const Date& date) const {
11         return sum + value * date.distance(lastDate);
12     }
13     void change(const Date& date, double value) {
14         sum = getSum(date);
15         lastDate = date;
16         this->value = value;
17     }
18     void reset(const Date& date, double value) {
19         lastDate = date;
20         this->value;
21         sum = 0;
22     }
23 };

View Code

account.h

 1 #pragma once
 2 #include"date.h"
 3 #include"accumulator.h"
 4 #include<string>
 5 using namespace std;
 6 class Account {
 7 private:
 8     string id;
 9     double balance;
10     static double total;
11 protected:
12     Account(const Date& date, const string &id);
13     void record(const Date& date, double amount, const string& desc);
14     void error(const string& msg) const;
15 public:const string& getId() { return id; }
16       double getBalance()const { return balance; }
17       static double getTotal() { return total; }
18       void show()const;
19 };
20 class SavingsAccount:public Account {
21 private:
22     Accumulator acc;
23     double rate;
24 public:
25     SavingsAccount(const Date& date, const string& id, double rate);
26     double getRate() const { return  rate; }
27     void deposit(const Date& date, double amount, const string& desc);
28     void withdraw(const Date& date, double amount, const string& desc);
29     void settle(const Date& date);
30 };
31 class CreditAccount :public Account {
32 private:
33     Accumulator acc;
34     double credit;
35     double rate;
36     double fee;
37     double getDebt()const {
38         double balance = getBalance();
39         return(balance < 0 ? balance : 0);
40     }
41 public:CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
42       double getCredit()const { return credit; }
43       double getRate()const { return rate; }
44       double getFee() const { return fee; }
45       double getAvailableCredit()const {
46           if (getBalance() < 0)return credit + getBalance();
47           else return credit;
48       }
49       void deposit(const Date& date, double amount, const string& desc);
50       void withdraw(const Date& date, double amount, const string& desc);
51       void settle(const Date& date);
52       void show()const;
53 };

View Code

date.cpp

 1 #include"date.h"
 2 #include<iostream>
 3 #include<cstdlib>
 4 using namespace std;
 5 namespace {
 6     const int DAYS_BEFIRE_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_BEFIRE_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_BEFIRE_MONTH[month] - DAYS_BEFIRE_MONTH[month - 1];
23 }
24 void Date::show()const {
25     cout << getYear() << "-" << getMonth() << "-" << getDay();
26 }

View Code

accmulator.cpp

 1 #include "account.h"
 2 #include <cmath>
 3 #include<iostream>
 4 using namespace std;
 5 double Account::total = 0;
 6 Account::Account(const Date& date, const string& id) :id(id), balance(0) {
 7     date.show();
 8     cout << "\t#" << id << "created" << endl;
 9 }
10 void Account::record(const Date& date, double amount, const string& desc) {
11     amount = floor(amount * 100 + 0.5) / 100;
12     balance += amount;
13     total += amount;
14     date.show();
15     cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
16 }
17 void Account::show()const { cout << id << "\tBalance:" << balance; }
18 void Account::error(const string& msg)const {
19     cout << "Error(#" << id << "):" << msg << endl;
20 }
21 SavingsAccount::SavingsAccount(const Date&date,const string &id,double rate):Account(date,id),rate(rate),acc(date,0){}
22 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
23     record(date, amount, desc);
24     acc.change(date, getBalance());
25 }
26 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
27     if (amount > getBalance()) {
28         error("not enough money");
29     }
30     else {
31         record(date, -amount, desc);
32         acc.change(date, getBalance());
33     }
34 }
35 void SavingsAccount::settle(const Date& date) {
36     double interest = acc.getSum(date) * rate/date.distance(Date(date.getYear()-1,1,1));
37     if (interest != 0)record(date, interest, "interest");
38     acc.reset(date, getBalance());
39 }
40 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){}
41 void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
42     record(date, amount, desc);
43     acc.change(date, getDebt());
44 }
45 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
46     if (amount - getBalance() > credit) {
47         error("not enouogh credit");
48     }
49     else {
50         record(date, -amount, desc);
51         acc.change(date, getDebt());
52     }
53 }
54 void CreditAccount::settle(const Date& date) {
55     double interest = acc.getSum(date) * rate;
56     if (interest != 0) record(date, interest, "interest");
57     if (date.getMonth() == 1)record(date, -fee, "annual fee");
58     acc.reset(date, getDebt());
59 }
60 void CreditAccount::show()const {
61     Account::show();
62     cout << "\tAvailable credit:" << getAvailableCredit();
63 }

View Code

task7.cpp

 1 #include "account.h"
 2 #include<iostream>
 3 using namespace std;
 4 int main() {
 5     Date date(2008, 11, 1);
 6     SavingsAccount sa1(date, "S3755217", 0.015);
 7     SavingsAccount sa2(date, "02342342", 0.015);
 8     CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
 9     sa1.deposit(Date(2008, 11, 5), 5000, "Salary");
10     ca.withdraw(Date(2008, 11, 15), 2000, "buy a cell");
11     sa2.deposit(Date(2008, 11, 25), 10000, "sell stock 0323");
12     ca.settle(Date(2008, 12, 1));
13     ca.deposit(Date(2008, 12,1), 2016, "repay the credit");
14     sa1.deposit(Date(2008, 12, 5), 5500, "salary");
15     sa1.settle(Date(2009, 1, 1));
16     sa2.settle(Date(2009, 1, 1));
17     ca.settle(Date(2009, 1, 1));
18     cout << endl;
19     sa1.show(); cout << endl;
20     sa2.show(); cout << endl;
21     ca.show(); cout << endl;
22     cout << "Total: " << Account::getTotal() << endl;
23     return 0;
24 
25 }

View Code

结果截图

posted @ 2024-11-24 13:08 张欣颜阅读(4) 评论(0) 编辑收藏举报

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