实验4 类的组合、继承、模板类、标准库

 1、实验任务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();
 18         void output() const;
 19         void sort(bool ascending=false);
 20         int min() const;
 21         int max() const;
 22         float average() const;
 23         void info();
 24         
 25     private:
 26         void compute();
 27         
 28     private:
 29         string course_name;
 30         int n;
 31         vector<int> counts=vector<int>(5,0);
 32         vector<double> rates=vector<double>(5,0);
 33 };
 34 
 35 GradeCalc::GradeCalc(const string &cname,int size):
 36 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         this->push_back(grade);
 44     }
 45 }
 46 
 47 void GradeCalc::output() const{
 48     for(auto ptr=this->begin();ptr!=this->end();++ptr)
 49         cout<<*ptr<<" ";
 50     cout<<endl;
 51 }
 52 
 53 void GradeCalc::sort(bool ascending){
 54     if(ascending)
 55         std::sort(this->begin(),this->end());
 56     else
 57         std::sort(this->begin(),this->end(),std::greater<int>());
 58 }
 59 
 60 int GradeCalc::min() const{
 61     return *std::min_element(this->begin(),this->end());
 62 }
 63 
 64 int GradeCalc::max() const{
 65     return *std::max_element(this->begin(),this->end());
 66 }
 67 
 68 float GradeCalc::average() const{
 69     return std::accumulate(this->begin(),this->end(),0)*1.0/n;
 70 }
 71 
 72 void GradeCalc::compute(){
 73     for(int grade: *this) {
 74         if(grade<60)
 75             counts.at(0)++;
 76         else if(grade>=60&&grade<70)
 77         counts.at(1)++;
 78         else if(grade>=70&&grade<80)
 79         counts.at(2)++;
 80         else if(grade>=80&&grade<90)
 81         counts.at(3)++;
 82         else if(grade>=90)
 83         counts.at(4)++;    
 84     }
 85     
 86     for(int i=0;i<rates.size();++i)
 87         rates.at(i)=counts.at(i)*1.0/n;
 88 }
 89 
 90 void GradeCalc::info() {
 91     cout << "课程名称:\t" << course_name << endl;
 92     cout << "排序后成绩: \t";
 93     sort(); output();
 94     cout << "最高分:\t" << max() << endl;
 95     cout << "最低分:\t" << min() << endl;
 96     cout << "平均分:\t" << std::fixed << std::setprecision(2) <<
 97     average() << endl;
 98     
 99     compute(); 
100     
101     vector<string> tmp{"[0, 60) ", "[60, 70)", "[70, 80)","[80, 90)",
102 "[90, 100]"};
103     for(int i=tmp.size()-1;i>=0;--i)
104         cout<<tmp[i]<<"\t:"<<counts[i]<<"人\t"
105             <<std::fixed<<std::setprecision(2)<<rates[i]*100<<"%"<<endl;
106 }

task2.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 }

结果截图：

 问题1：

  • 成绩存储在GradeCalc继承自vector<int>的对象中。
  • sort调用vector<int>的方法，使用 this->begin() 和 this->end() 访问成绩，通过 std::sort 对成绩排序。
  • min使用std::min_element算法返回最小值。
  • max使用std::max_element算法返回最大值。
  • average使用std::accumulate计算成绩的总和然后除以n得到平均分。
  • output使用this->begin()和this->end()遍历GradeCalc对象中的所有元素，并通过 cout 输出成绩。

问题2：

  • 分母功能是将总和除以总人数得到平均值。
  • 有影响。
  • 使结果带有小数部分。

问题3：

  • 应增加代码检查输入成绩是否有效、合理。

  • 可以考虑使用动态数组，便于更新已有成绩或增减成员。

  • 可以增加成绩中位数、标准差等指标。

2、实验任务3

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 }

task3.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 }

结果截图：

 问题1：

  • 存储在grade成员变量中。
  • sort调用std::sort对成绩进行排序。
  • min调用std::min_element。
  • max调用std::max_element。
  • average调用std::accumulate。
  • output通过遍历grades，依次输出每个学生的成绩。
  • 实验二中指针指向基类元素vector<int>里的值，实验三指向对象的成员vector<int>里的值

问题2：

  • 类通过继承可以直接访问基类的非私有成员函数，并将这些函数作为自己的接口；而类的组合则是通过包含其他对象作为成员来实现功能，操作这些对象时需要通过它们提供的接口。

3、实验任务4

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 }

结果截图：

去掉line35运行结果：

 用途：清除输入缓冲区中的多余字符，确保后续的 getline 操作能够按预期工作。

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 }

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 }

结果截图：

 去掉line16的运行结果：

 用途：清理输入流中未被cin>>n读取的换行符，确保后续的getline能够从输入流中正确地读取用户输入的字符串，而不会因为残留的换行符立即返回空字符串。

4、实验任务5

 grm.hpp

 1 #include<iostream>
 2 #pragma once
 3 
 4 using namespace std;
 5 
 6 template<typename T>
 7 class GameResourceManager{
 8     private:
 9         T resource;
10     public:
11         GameResourceManager(T invalue):resource(invalue){}
12         T get() const{
13             return resource;
14         }
15         void update(T data){
16             resource+=data;
17             if(resource<0){
18                 resource=0;
19             }
20         }
21         
22 };

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 }

结果截图：

5、实验任务6

 info.hpp

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

task6.cpp

 1 #include"info.hpp"
 2 #include<iostream>
 3 #include<string>
 4 #include<vector>
 5 
 6 using namespace std;
 7 
 8 int main() {
 9     vector<Info>audience_lst;
10     const int capaciry = 100;
11     string nickname, contact, city;
12     int last=100,number;
13     cout << "昵称         " << "联系方式（邮箱/手机号）     " << "所在城市      " << "预定参加人数" << endl;
14     while (cin >> nickname >> contact >> city >> number) {
15         if (nickname == "000")break;
16         int last1 = last;
17         last -=number ;
18         if (last < 0) {
19             cout << "对不起，只剩" << last1 << "个位置" << endl;
20             cout << "1.输入u，更新（update）预定信息" << endl;
21             cout << "2.输入q，退出预定" << endl;
22             cout << "你的选择：";
23             string n;
24             cin >> n;
25             if (n == "q")return 0;
26             if (n == "u") {
27                 cout << "请重新输入预定信息：" << endl;
28                 cin >> nickname >> contact >> city >> number;
29             }
30             audience_lst.push_back(Info(nickname, contact, city, number));
31         }
32         else {
33             audience_lst.push_back(Info(nickname, contact, city, number));
34         }
35     }
36     cout << "截至目前，一共有100位听众预约。预约听众信息如下：" << endl;
37     for (auto i : audience_lst) {
38         i.display();
39     }
40     cout << string(30, '-') << endl;
41 }

结果截图：

6、实验任务7

date.h

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

date.cpp

 1 #include"date.h"
 2 #include<iostream>
 3 #include<cstdlib>
 4 using namespace std;
 5 namespace {
 6     const int DAYS_BEFORE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304,334,365 };
 7 }
 8 Date::Date(int year, int month, int day) :year{ year }, month{ month }, day{ day } {
 9     if (day <= 0 || day > getMaxDay()) {
10         cout << "Invalid date:";
11         show();
12         cout << endl;
13         exit(1);
14     }
15     int years = year - 1;
16     totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day;
17     if (isLeapYear() && month > 2)totalDays++;
18 }
19 int Date::getMaxDay()const {
20     if (isLeapYear() && month == 2)
21         return 29;
22     else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1];
23 }
24 
25 void Date::show()const {
26     cout << getYear() << "-" << getMonth() << "-" << getDay();
27 }

accumulator.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

account.h

 1 #pragma once
 2 #ifndef  ACCOUNT H
 3 #define  ACCOUNT H
 4 #include"date.h"
 5 #include"accumulator.h"
 6 #include<string>
 7 class Account {
 8 private:
 9     std::string id;
10     double balance;
11     static double total;
12 protected:
13     Account(const Date& date, const std::string& id);
14     void record(const Date& date, double amount, const std::string& desc);
15     void error(const std::string& msg)const;
16 public:
17     const std::string& getId()const { return id; }
18     double getBalance()const { return balance; }
19     static double getTotal() { return total; }
20 
21     void show()const;
22 };
23 class SavingsAccount :public Account {
24 private:
25     Accumulator acc;
26     double rate;
27 public:
28     SavingsAccount(const Date& date, const std::string& id, double rate);
29     double getRate()const { return rate; }
30 
31     void deposit(const Date& date, double amount, const std::string& desc);
32     void withdraw(const Date& date, double amount, const std::string& desc);
33     void settle(const Date& date);
34 };
35 class CreditAccount :public Account {
36 private:
37     Accumulator acc;
38     double credit;
39     double rate;
40     double fee;
41     double getDebt()const {
42         double balance = getBalance();
43         return (balance < 0 ? balance : 0);
44     }
45 public:
46     CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee);
47     double getCredit()const { return credit; }
48     double getRate()const { return rate;}
49     double getAvailableCredit()const {
50         if (getBalance() < 0)
51             return credit + getBalance();
52         else
53             return credit;
54     }
55     void deposit(const Date& date, double amount, const std::string& desc);
56     void withdraw(const Date& date, double amount, const std::string& desc);
57     void settle(const Date& date);
58     void show()const;
59 };
60 #endif//ACCOUNT H

account.cpp

 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 }

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(); cout << endl;
27     sa2.show(); cout << endl;
28     ca.show(); cout << endl;
29     cout << "Total:" << Account::getTotal() << endl;
30     return 0;
31 }

结果截图：

改进：类增加，功能更加完善。

问题：代码较冗杂。

posted @ 2024-11-23 10:24  lbldmx  阅读(13)  评论(0)  编辑  收藏  举报