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 };
View Code
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 }
View Code
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
标签：const,int,void,Date,实验,date,include From： https://www.cnblogs.com/zyf-666/p/18553227