任务1:
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 }
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 }
结果截图：
task1_3.cpp:
1 #include <complex>
2 #include <vector>
3 #include <array>
4
5 int main() {
6 using namespace std;
7
8 complex<double> x1(5,3); // complex类模板，特化到double类型
9 vector<int> x2{1, 9, 8, 4}; // vector类模板，特化到int类型
10 array<int, 4> x3{1,9, 8, 4}; // array类模板，特化到int类型
11 // 其它略
12 }
结果截图：
任务2
GradaCalc.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 }
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 }
运行结果截图：
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？
程序储存在vector<int>中，通过迭代器this->begin()和this->end()访问成绩，使用std::vector的push_back将成绩存入容器。
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？
分母的功能是求出所有成绩平均值。有影响。1.0可以将整型化为浮点型。
问题三：：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？、
只能进行成绩统计，功能单一。
任务3：
GradaCalc.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 }
运行结果截图：
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都有访问成绩，是通过什么接口访问到每个成绩？观察与实验任务2在代码写法细节上的差别。
成绩存储在std::vector<int>。通过直接访问grades成员变量来操作成绩。
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？
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 }
运行结果截图：
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？
结果截图：
作用：清除cin中残留的字符
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 }
运行结果截图：
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 }
运行结果截图：
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？
运行结果截图：
作用：清除换行符
任务5：
grm.hpp
1 #pragma once
2
3 #include<iostream>
4 using namespace std;
5
6 template<typename T>
7 class GameResourceManager {
8 public:
9 GameResourceManager(T resource0);
10 T get();
11 void update(T gengxin);
12 private:
13 T resource;
14 };
15
16 template<typename T>
17 GameResourceManager<T>::GameResourceManager(T resource0) :resource{ resource0 } {
18 }
19
20 template<typename T>
21 T GameResourceManager<T>::get() {
22 return resource;
23 }
24
25 template<typename T>
26 void GameResourceManager<T>::update(T gengxin) {
27 resource += gengxin;
28 if (resource < 0)
29 resource = 0;
30 }
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 }
运行结果：
任务6
info.hpp
1 #pragma once
2 #include <iostream>
3 #include <string>
4
5 using std::cout;
6 using std::endl;
7 using std::string;
8
9 class Info {
10 public:
11 Info(string nickname0, string contact0, string city0, int n0);
12
13 void display() const;
14
15 private:
16 string nickname;
17 string contact;
18 string city;
19 int n;
20 };
21
22 Info::Info(string nickname0, string contact0, string city0, int n0)
23 : nickname(nickname0), contact(contact0), city(city0), n(n0) {}
24
25 void Info::display() const {
26 cout << "-------------------------------------\n";
27 cout << "昵称:\t" << nickname << endl;
28 cout << "联系方式:\t" << contact << endl;
29 cout << "所在城市:\t" << city << endl;
30 cout << "预定人数:\t" << n << endl;
31 }
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 const int max_capacity = 100;
10 vector<Info> reservations;
11 string nickname, contact, city;
12 int attendees, total = 0;
13 char option;
14
15 cout << "请输入用户预约信息：" << endl;
16
17 while (cin >> nickname >> contact >> city >> attendees) {
18 if (total + attendees > max_capacity) {
19 cout << "剩余容量不足，仅剩 " << max_capacity - total << " 个座位。" << endl;
20 cout << "1. 输入 u 重新更新预约信息" << endl;
21 cout << "2. 输入 q 退出预约" << endl;
22 cout << "请选择: ";
23 cin >> option;
24
25 if (option == 'u') {
26 cout << "重新输入预约信息：" << endl;
27 continue;
28 } else {
29 break;
30 }
31 }
32
33 reservations.emplace_back(nickname, contact, city, attendees);
34 total += attendees;
35 }
36
37 cout << "\n当前已有 " << total << " 人预约。预约信息如下：" << endl;
38
39 for (const auto& info : reservations) {
40 info.display();
41 }
42
43 return 0;
44 }
运行结果截图：
任务7
date.h
1 #ifndef __DATE_H__
2 #define __DATE_H__
3 class Date{
4 private:
5 int year;
6 int month;
7 int day;
8 int totalDays;
9 public:
10 Date(int year,int month,int day);
11 int getYear() const {return year;}
12 int getMonth() const {return month;}
13 int getDay() const {return day;}
14 int getMaxDay() const;
15 bool isLeapYear() const {
16 return year%4==0 && year%100 !=0 ||year%400==0;
17 }
18 void show() const;
19
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
20 int Date::getMaxDay() const {
21 if(isLeapYear()&&month==2)
22 return 29;
23 else
24 return DAYS_BEFORE_MONTH[month]-DAYS_BEFORE_MONTH[month-1];
25 }
26
27 void Date::show() const {
28 cout<<getYear()<<"-"<<getMonth()<<"-"<<getDay();
29 }
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
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.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 }
运行结果：
标签：std,const,int,void,实验,date,include From： https://www.cnblogs.com/rxt711/p/18553218