实验4

实验任务1：

 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 }

View Code

 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 }

View Code

实验任务2：

 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

  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

问题1：

成绩储存从vector中继承，通过begin、end接口访问数据，通过protected接口存入

问题2：

将所有数据求和并取平均值，有，转换数据类型

问题3：

可能输入0-100分之外的数据

实验任务3：

 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

  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

问题1：

储存在grade中，通过begin、end接口，代码3将成绩储存在私有成员中，代码2储存在基类继承的vector中

问题2：

类的设计和接口实现细节不唯一比较灵活

实验任务4：

 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

问题1：

ingore用于清除缓冲区的换行符

 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

 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

问题2：

用于清除换行符

实验任务5：

 1 #include<iostream>
 2 using namespace std;
 3 template<typename T>
 4 class GameResourceManager{
 5     private:
 6         T resource;
 7     public:
 8         GameResourceManager(T a){
 9             resource=a;
10         }
11         T get(){
12             return resource;
13         }
14         void update(T b){
15             resource+=b;
16             if(resource<0)
17             resource=0;
18         }
19         
20 };

View Code

 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

实验任务6：

 1  #include"info.hpp"
 2  #include<iomanip>
 3  #include<vector>
 4  const int capacity = 100;
 5  int main() {
 6      cout << "录入用户预约信息:" << endl;
 7      cout << "用户个数:";
 8      int n;
 9      cin >> n;
10      cout << "昵称" << "        " << "联系方式(邮箱/手机号)" << "        " << "所在城市" << "        " << "预定参加人数" << endl;
11      vector<Info> v;
12      string nickname;
13      string contact;
14      string city;
15      int num;
16      int sum = 0;
17      for (int i = 0; i < n; i++) {
18          cin >> nickname >> contact >> city >> num;
19          sum += num;
20          if (sum > capacity) {
21              char choice;
22              cout << "对不起，只剩" << 100 + num - sum << "个位置" << endl;
23              cout << "1. 输入u,更新(update)预定信息" << endl;
24              cout << "2. 输入q,退出预定" << endl;
25              cout << "你的选择: ";
26              cin >> choice;
27              if (choice == 'u') {
28                  sum -= num;
29                  cout << "请重新输入预定信息" << endl;
30                  cin >> nickname >> contact >> city >> num;
31                  sum += num;
32              }
33              else if(choice=='q') {
34                  continue;
35              }
36          }
37         v.push_back(Info(nickname, contact, city, num));
38      }
39      cout << "截至目前,一共有" << sum << "位听众预约。" << "预约听众信息如下:" << endl;
40      for (auto i : v) {
41          i.display();
42      }
43      cout << string(40, '*');
44      return 0;
45  }

View Code

 1  #pragma once
 2   #include<iostream>
 3   #include<iomanip>
 4   using namespace std;
 5   class Info {
 6   public:
 7       string nickname;
 8       string contact;
 9      string city;
10      int n;
11  public:
12      Info(string nickname_,string contact_,string city_,int n_):nickname(nickname_),contact(contact_),city(city_), n(n_) {}
13      void display()const {
14          cout << string(40, '*') << endl;
15          cout <<  "昵称:" << "        " << nickname << endl;
16          cout << "联系方式:" << "        " << contact << endl;
17          cout <<  "所在城市:" << "        " << city << endl;
18          cout << "预定人数:" << "        " << n << endl;
19      }
20  };

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实验任务7：

 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  }

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 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

 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

 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

 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

 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

posted @ 2024-11-18 18:28 白小泽阅读(5) 评论(0) 编辑收藏举报

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