实验四
实验任务1：
（1）代码部分：
1 task1_1 2 #include <iostream> 3 4 using std::cout; 5 using std::endl; 6 7 // 类A的定义 8 class A { 9 public: 10 A(int x0, int y0); 11 void display() const; 12 13 private: 14 int x, y; 15 }; 16 17 A::A(int x0, int y0): x{x0}, y{y0} { 18 } 19 20 void A::display() const { 21 cout << x << ", " << y << endl; 22 } 23 24 // 类B的定义 25 class B { 26 public: 27 B(double x0, double y0); 28 void display() const; 29 30 private: 31 double x, y; 32 }; 33 34 B::B(double x0, double y0): x{x0}, y{y0} { 35 } 36 37 void B::display() const { 38 cout << x << ", " << y << endl; 39 } 40 41 void test() { 42 cout << "测试类A: " << endl; 43 A a(3, 4); 44 a.display(); 45 46 cout << "\n测试类B: " << endl; 47 B b(3.2, 5.6); 48 b.display(); 49 } 50 51 int main() { 52 test(); 53 } 54 55 task1_2 56 #include <iostream> 57 #include <string> 58 59 using std::cout; 60 using std::endl; 61 using std::string; 62 63 // 定义类模板 64 template<typename T> 65 class X{ 66 public: 67 X(T x0, T y0); 68 void display(); 69 70 private: 71 T x, y; 72 }; 73 74 template<typename T> 75 X<T>::X(T x0, T y0): x{x0}, y{y0} { 76 } 77 78 template<typename T> 79 void X<T>::display() { 80 cout << x << ", " << y << endl; 81 } 82 83 84 void test() { 85 cout << "测试1: 类模板X中的抽象类型T用int实例化" << endl; 86 X<int> x1(3, 4); 87 x1.display(); 88 89 cout << endl; 90 91 cout << "测试2: 类模板X中的抽象类型T用double实例化" << endl; 92 X<double> x2(3.2, 5.6); 93 x2.display(); 94 95 cout << endl; 96 97 cout << "测试3: 类模板X中的抽象类型T用string实例化" << endl; 98 X<string> x3("hello", "oop"); 99 x3.display(); 100 } 101 102 int main() { 103 test(); 104 }
（2）运行结果：
实验任务2：
（1）代码部分：
1 GradeCalc.hpp 2 #include <iostream> 3 #include <vector> 4 #include <string> 5 #include <algorithm> 6 #include <numeric> 7 #include <iomanip> 8 9 using std::vector; 10 using std::string; 11 using std::cin; 12 using std::cout; 13 using std::endl; 14 15 class GradeCalc: public vector<int> { 16 public: 17 GradeCalc(const string &cname, int size); 18 void input(); // 录入成绩 19 void output() const; // 输出成绩 20 void sort(bool ascending = false); // 排序 (默认降序) 21 int min() const; // 返回最低分 22 int max() const; // 返回最高分 23 float average() const; // 返回平均分 24 void info(); // 输出课程成绩信息 25 26 private: 27 void compute(); // 成绩统计 28 29 private: 30 string course_name; // 课程名 31 int n; // 课程人数 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 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) << average() << endl; 97 98 compute(); // 统计各分数段人数、比例 99 100 vector<string> tmp{"[0, 60) ", "[60, 70)", "[70, 80)","[80, 90)", "[90, 100]"}; 101 for(int i = tmp.size()-1; i >= 0; --i) 102 cout << tmp[i] << "\t: " << counts[i] << "人\t" 103 << std::fixed << std::setprecision(2) << rates[i]*100 << "%" << endl; 104 } 105 106 demo2.cpp 107 #include "GradeCalc.hpp" 108 #include <iomanip> 109 110 void test() { 111 int n; 112 cout << "输入班级人数: "; 113 cin >> n; 114 115 GradeCalc c1("OOP", n); 116 117 cout << "录入成绩: " << endl;; 118 c1.input(); 119 cout << "输出成绩: " << endl; 120 c1.output(); 121 122 cout << string(20, '*') + "课程成绩信息" + string(20, '*') << endl; 123 c1.info(); 124 } 125 126 int main() { 127 test(); 128 }
（2）运行结果：
（3）问题1：在派生类GradeCalc的定义中，成绩储存在int类型的vector数组中；通过vector提供的接口来访问成绩；input()是通过vector提供的push_back()接口向队尾插入新元素；
问题2：分母的功能是计算平均分；结果有影响，因为没有乘以1.0结果为int类型，小数部分会四舍五入，精度缺失；乘以1.0将数据变为double类型避免精度缺失；
问题3：没有对输入成绩进行合法性判断，可能会输入超出总分范围的成绩；考虑支持输入其他类型数据，如浮点数等；
实验任务3：
（1）代码部分：
1 GradeCalc.hpp 2 #include <iostream> 3 #include <vector> 4 #include <string> 5 #include <algorithm> 6 #include <numeric> 7 #include <iomanip> 8 9 using std::vector; 10 using std::string; 11 using std::cin; 12 using std::cout; 13 using std::endl; 14 15 class GradeCalc { 16 public: 17 GradeCalc(const string &cname, int size); 18 void input(); // 录入成绩 19 void output() const; // 输出成绩 20 void sort(bool ascending = false); // 排序 (默认降序) 21 int min() const; // 返回最低分 22 int max() const; // 返回最高分 23 float average() const; // 返回平均分 24 void info(); // 输出课程成绩信息 25 26 private: 27 void compute(); // 成绩统计 28 29 private: 30 string course_name; // 课程名 31 int n; // 课程人数 32 vector<int> grades; // 课程成绩 33 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] 34 vector<double> rates = vector<double>(5, 0); // 保存各分数段比例 35 }; 36 37 GradeCalc::GradeCalc(const string &cname, int size): course_name{cname}, n{size} {} 38 39 void GradeCalc::input() { 40 int grade; 41 42 for(int i = 0; i < n; ++i) { 43 cin >> grade; 44 grades.push_back(grade); 45 } 46 } 47 48 void GradeCalc::output() const { 49 for(int grade: grades) 50 cout << grade << " "; 51 cout << endl; 52 } 53 54 void GradeCalc::sort(bool ascending) { 55 if(ascending) 56 std::sort(grades.begin(), grades.end()); 57 else 58 std::sort(grades.begin(), grades.end(), std::greater<int>()); 59 60 } 61 62 int GradeCalc::min() const { 63 return *std::min_element(grades.begin(), grades.end()); 64 } 65 66 int GradeCalc::max() const { 67 return *std::max_element(grades.begin(), grades.end()); 68 } 69 70 float GradeCalc::average() const { 71 return std::accumulate(grades.begin(), grades.end(), 0) * 1.0 / n; 72 } 73 74 void GradeCalc::compute() { 75 for(int grade: grades) { 76 if(grade < 60) 77 counts.at(0)++; 78 else if(grade >= 60 && grade < 70) 79 counts.at(1)++; 80 else if(grade >= 70 && grade < 80) 81 counts.at(2)++; 82 else if(grade >= 80 && grade < 90) 83 counts.at(3)++; 84 else if(grade >= 90) 85 counts.at(4)++; 86 } 87 88 for(int i = 0; i < rates.size(); ++i) 89 rates.at(i) = counts.at(i) *1.0 / n; 90 } 91 92 void GradeCalc::info() { 93 cout << "课程名称:\t" << course_name << endl; 94 cout << "排序后成绩: \t"; 95 sort(); output(); 96 cout << "最高分:\t" << max() << endl; 97 cout << "最低分:\t" << min() << endl; 98 cout << "平均分:\t" << std::fixed << std::setprecision(2) << average() << endl; 99 100 compute(); // 统计各分数段人数、比例 101 102 vector<string> tmp{"[0, 60) ", "[60, 70)", "[70, 80)","[80, 90)", "[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 } 107 108 demo3.cpp 109 #include "GradeCalc.hpp" 110 #include <iomanip> 111 112 void test() { 113 int n; 114 cout << "输入班级人数: "; 115 cin >> n; 116 117 GradeCalc c1("OOP", n); 118 119 cout << "录入成绩: " << endl;; 120 c1.input(); 121 cout << "输出成绩: " << endl; 122 c1.output(); 123 124 cout << string(20, '*') + "课程成绩信息" + string(20, '*') << endl; 125 c1.info(); 126 } 127 128 int main() { 129 test(); 130 }
（2）运行结果：
（3）问题1：在派生类GradeCalc中，成绩存储在类的私有成员grades中；sort，input等函数是通过vector提供的接口访问成绩的；
问题2：面向对象允许我们通过多种方式实现同一功能，可以通过不断改进提升代码质量；
实验任务4：
（1）代码部分：
1 task4_1 2 #include <iostream> 3 #include <string> 4 #include <limits> 5 6 using namespace std; 7 8 void test1() { 9 string s1, s2; 10 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 11 cout << "s1: " << s1 << endl; 12 cout << "s2: " << s2 << endl; 13 } 14 15 void test2() { 16 string s1, s2; 17 getline(cin, s1); // getline(): 从输入流中提取字符串，直到遇到换行符 18 getline(cin, s2); 19 cout << "s1: " << s1 << endl; 20 cout << "s2: " << s2 << endl; 21 } 22 23 void test3() { 24 string s1, s2; 25 getline(cin, s1, ' '); //从输入流中提取字符串，直到遇到指定分隔符 26 getline(cin, s2); 27 cout << "s1: " << s1 << endl; 28 cout << "s2: " << s2 << endl; 29 } 30 31 int main() { 32 cout << "测试1: 使用标准输入流对象cin输入字符串" << endl; 33 test1(); 34 cout << endl; 35 36 cin.ignore(numeric_limits<streamsize>::max(), '\n'); 37 38 cout << "测试2: 使用函数getline()输入字符串" << endl; 39 test2(); 40 cout << endl; 41 42 cout << "测试3: 使用函数getline()输入字符串, 指定字符串分隔符" << endl; 43 test3(); 44 } 45 46 task4_2 47 #include <iostream> 48 #include <string> 49 #include <vector> 50 #include <limits> 51 52 using namespace std; 53 54 void output(const vector<string> &v) { 55 for(auto &s: v) 56 cout << s << endl; 57 } 58 59 void test() { 60 int n; 61 while(cout << "Enter n: ", cin >> n) { 62 vector<string> v1; 63 64 for(int i = 0; i < n; ++i) { 65 string s; 66 cin >> s; 67 v1.push_back(s); 68 } 69 70 cout << "output v1: " << endl; 71 output(v1); 72 cout << endl; 73 } 74 } 75 76 int main() { 77 cout << "测试: 使用cin多组输入字符串" << endl; 78 test(); 79 } 80 81 task4_3 82 #include <iostream> 83 #include <string> 84 #include <vector> 85 #include <limits> 86 87 using namespace std; 88 89 void output(const vector<string> &v) { 90 for(auto &s: v) 91 cout << s << endl; 92 } 93 94 void test() { 95 int n; 96 while(cout << "Enter n: ", cin >> n) { 97 cin.ignore(numeric_limits<streamsize>::max(), '\n'); 98 99 vector<string> v2; 100 101 for(int i = 0; i < n; ++i) { 102 string s; 103 getline(cin, s); 104 v2.push_back(s); 105 } 106 cout << "output v2: " << endl; 107 output(v2); 108 cout << endl; 109 } 110 } 111 112 int main() { 113 cout << "测试: 使用函数getline()多组输入字符串" << endl; 114 test(); 115 }
（2）运行结果：
（3）问题1：用来清除以回车结束的输入缓冲区的内容，消除上一次输入对下一次输入的影响；
问题2：用来消除输入n的值时输入的回车键对下方输入字符串的影响；
实验任务5
（1）代码部分：
1 grm.hpp 2 #pragma once 3 4 #include<bits/stdc++.h> 5 using namespace std; 6 7 template<typename T> 8 class GameResourceManager{ 9 public: 10 GameResourceManager(T n):num{n}{} 11 T get(){ 12 return num; 13 } 14 void update(T n){ 15 num+=n; 16 if(num<0) 17 num=0; 18 } 19 private: 20 T num; 21 }; 22 task5.cpp 23 #include "grm.hpp" 24 #include <iostream> 25 26 using std::cout; 27 using std::endl; 28 29 void test1() { 30 GameResourceManager<float> HP_manager(99.99); 31 cout << "当前生命值: " << HP_manager.get() << endl; 32 HP_manager.update(9.99); 33 cout << "增加9.99生命值后, 当前生命值: " << HP_manager.get() << endl; 34 HP_manager.update(-999.99); 35 cout <<"减少999.99生命值后, 当前生命值: " << HP_manager.get() << endl; 36 } 37 38 void test2() { 39 GameResourceManager<int> Gold_manager(100); 40 cout << "当前金币数量: " << Gold_manager.get() << endl; 41 Gold_manager.update(50); 42 cout << "增加50个金币后, 当前金币数量: " << Gold_manager.get() << endl; 43 Gold_manager.update(-99); 44 cout <<"减少99个金币后, 当前金币数量: " << Gold_manager.get() << endl; 45 } 46 47 48 int main() { 49 cout << "测试1: 用float类型对类模板GameResourceManager实例化" << endl; 50 test1(); 51 cout << endl; 52 53 cout << "测试2: 用int类型对类模板GameResourceManager实例化" << endl; 54 test2(); 55 }
（2）运行结果：
实验任务6
（1）代码部分：
1 #pragma once 2 #include<bits/stdc++.h> 3 using namespace std; 4 5 class info{ 6 public: 7 info(string s1,string s2,string s3,int num):nickname{s1},contact{s2},city{s3},member{num}{} 8 void dispaly(){ 9 cout<<"昵称："<<"\t"<<nickname<<endl; 10 cout<<"联系方式："<<"\t"<<contact<<endl; 11 cout<<"所在城市："<<"\t"<<city<<endl; 12 cout<<"预定参加人数："<<"\t"<<member<<endl; 13 int i=30; 14 while(i){ 15 cout<<'-'; 16 i--; 17 } 18 cout<<endl; 19 } 20 private: 21 string nickname; 22 string contact; 23 string city; 24 int member; 25 }; 26 #include"info.hpp" 27 #include<bits/stdc++.h> 28 using namespace std; 29 30 int main(){ 31 int sum=0,n; 32 string s1,s2,s3; 33 const int capacity=100; 34 vector<info> audience_info_list; 35 cout<<"录入用户预约信息："<<"\n"<<endl; 36 cout<<"昵称"<<"\t"<<"联系方式"<<"\t"<<"所在城市"<<"\t"<<"预定参加人数"<<endl; 37 while(cin>>s1){ 38 if(s1=="End")break;cin>>s2>>s3>>n; 39 if(sum+n>capacity){ 40 cout<<"对不起,只剩"<<capacity-sum<<"个位置"<<endl; 41 cout<<"输入u，更新（update）预定信息"<<endl; 42 cout<<"输入q，退出预定"<<endl; 43 cout<<"你的选择："; 44 char ch; 45 cin>>ch; 46 if(ch=='u'){ 47 cout<<"请重新输入预定信息："<<endl; 48 continue; 49 } 50 else 51 break; 52 } 53 info member(s1,s2,s3,n); 54 sum+=n; 55 audience_info_list.push_back(member); 56 if(sum==capacity)break; 57 } 58 cout<<"截至目前，一共"<<sum<<"位听众预约。预约听众信息如下："<<endl; 59 for(int i=1;i<=30;i++) 60 cout<<'-'; 61 cout<<endl; 62 for(int i=0;i<audience_info_list.size();i++) 63 audience_info_list[i].dispaly(); 64 return 0; 65 }
（2）运行结果：
实验任务7：
（1）代码部分：
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 25 #include"bankdate.h" 26 #include<iostream> 27 #include<cstdlib> 28 using namespace std; 29 namespace { 30 const int DAYS_BEFORE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304,334,365 }; 31 } 32 Date::Date(int year, int month, int day) :year{ year }, month{ month }, day{ day } { 33 if (day <= 0 || day > getMaxDay()) { 34 cout << "Invalid date:"; 35 show(); 36 cout << endl; 37 exit(1); 38 } 39 int years = year - 1; 40 totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day; 41 if (isLeapYear() && month > 2)totalDays++; 42 } 43 int Date::getMaxDay()const { 44 if (isLeapYear() && month == 2) 45 return 29; 46 else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1]; 47 } 48 void Date::show()const { 49 cout << getYear() << "-" << getMonth() << "-" << getDay(); 50 } 51 52 #pragma once 53 #ifndef ACCUMULATOR H 54 #define ACCUMULATOR H 55 #include"bankdate.h" 56 class Accumulator { 57 private: 58 Date lastDate; 59 double value; 60 double sum; 61 public: 62 Accumulator(const Date& date, double value) :lastDate(date), value(value), sum{ 0 } { 63 } 64 65 double getSum(const Date& date)const { 66 return sum + value * date.distance(lastDate); 67 } 68 69 void change(const Date& date, double value) { 70 sum = getSum(date); 71 lastDate = date; this->value = value; 72 } 73 74 void reset(const Date& date, double value) { 75 lastDate = date; this->value = value; sum = 0; } 76 }; 77 #endif//ACCUMULATOR H 78 79 #pragma once 80 #ifndef ACCOUNT H 81 #define ACCOUNT H 82 #include"bankdate.h" 83 #include"bankaccumulator.h" 84 #include<string> 85 class Account { 86 private: 87 std::string id; 88 double balance; 89 static double total; 90 protected: 91 Account(const Date& date, const std::string& id); 92 void record(const Date& date, double amount, const std::string& desc); 93 void error(const std::string& msg)const; 94 public: 95 const std::string& getId()const { return id; } 96 double getBalance()const { return balance; } 97 static double getTotal() { return total; } 98 99 void show()const; 100 }; 101 class SavingsAccount :public Account { 102 private: 103 Accumulator acc; 104 double rate; 105 public: 106 SavingsAccount(const Date& date, const std::string& id, double rate); 107 double getRate()const { return rate; } 108 109 void deposit(const Date& date, double amount, const std::string& desc); 110 void withdraw(const Date& date, double amount, const std::string& desc); 111 void settle(const Date& date); 112 }; 113 class CreditAccount :public Account { 114 private: 115 Accumulator acc; 116 double credit; 117 double rate; 118 double fee; 119 double getDebt()const { 120 double balance = getBalance(); 121 return (balance < 0 ? balance : 0); 122 } 123 public: 124 CreditAccount(const Date& date, const std::string& id, double credit, double rate, double fee); 125 double getCredit()const { return credit; } 126 double getRate()const { return rate;} 127 double getAvailableCredit()const { 128 if (getBalance() < 0) 129 return credit + getBalance(); 130 else 131 return credit; 132 } 133 void deposit(const Date& date, double amount, const std::string& desc); 134 void withdraw(const Date& date, double amount, const std::string& desc); 135 void settle(const Date& date); 136 void show()const; 137 }; 138 #endif//ACCOUNT H 139 #include"bankaccount.h" 140 #include<cmath> 141 #include<iostream> 142 using namespace std; 143 double Account::total = 0; 144 145 Account::Account(const Date& date, const string& id) :id{ id }, balance{ 0 } { 146 date.show(); cout << "\t#" << id << "created" << endl; 147 } 148 149 150 void Account::record(const Date& date, double amount, const string& desc) { 151 amount = floor(amount * 100 + 0.5) / 100; 152 balance += amount; 153 total += amount; 154 date.show(); 155 cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl; 156 } 157 158 void Account::show()const { cout << id << "\tBalance:" << balance; } 159 void Account::error(const string& msg)const { 160 cout << "Error(#" << id << "):" << msg << endl; 161 } 162 163 SavingsAccount::SavingsAccount(const Date&date,const string&id,double rate):Account(date,id),rate(rate), acc(date,0){} 164 165 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) { 166 record(date, amount, desc); 167 acc.change(date, getBalance()); 168 } 169 170 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) { 171 if (amount > getBalance()) { 172 error("not enough money"); 173 } 174 else { 175 record(date, -amount, desc); 176 acc.change(date, getBalance()); 177 } 178 } 179 180 void SavingsAccount::settle(const Date& date) { 181 double interest = acc.getSum(date) * rate / date.distance(Date(date.getYear() - 1, 1, 1)); 182 if (interest != 0)record(date, interest, "interest"); 183 acc.reset(date, getBalance()); 184 } 185 186 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){} 187 188 void CreditAccount::deposit(const Date& date, double amount, const string& desc) { 189 record(date, amount, desc); 190 acc.change(date, getDebt()); 191 } 192 193 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) { 194 if (amount - getBalance() > credit) { 195 error("not enough credit"); 196 } 197 else { 198 record(date, -amount, desc); 199 acc.change(date, getDebt()); 200 } 201 } 202 203 void CreditAccount::settle(const Date& date) { 204 double interest = acc.getSum(date) * rate; 205 if (interest != 0)record(date, interest, "interest"); 206 if (date.getMonth() == 1) 207 record(date, -fee, "annual fee"); 208 acc.reset(date, getDebt()); 209 } 210 211 void CreditAccount::show()const { 212 Account::show(); 213 cout << "\tAvailable credit:" << getAvailableCredit(); 214 } 215 216 #include"bankaccount.h" 217 #include<iostream> 218 219 using namespace std; 220 221 int main() { 222 Date date(2008, 11, 1); 223 SavingsAccount sa1(date, "S3755217", 0.015); 224 SavingsAccount sa2(date, "02342342", 0.015); 225 CreditAccount ca(date, "C5392394", 10000, 0.0005, 50); 226 227 sa1.deposit(Date(2008, 11, 5), 5000, "salary"); 228 ca.withdraw(Date(2008, 11, 15), 2000, "buy a cell"); 229 sa2.deposit(Date(2008, 11, 25), 10000, "sell stock 0323"); 230 231 ca.settle(Date(2008, 12, 1)); 232 233 ca.deposit(Date(2008, 12, 1), 2016, "repay the credit"); 234 sa1.deposit(Date(2008, 12, 5), 5500, "salary"); 235 236 sa1.settle(Date(2009, 1, 1)); 237 sa2.settle(Date(2009, 1, 1)); 238 ca.settle(Date(2009, 1, 1)); 239 240 cout << endl; 241 sa1.show(); cout << endl; 242 sa2.show(); cout << endl; 243 ca.show(); cout << endl; 244 cout << "Total:" << Account::getTotal() << endl; 245 return 0; 246 }
（2）运行结果：
