实验五
实验任务三
task3.cpp
#include <iostream>
#include <vector>
#include "pets.hpp"
void test() {
using namespace std;
vector<MachinePets *> pets;
pets.push_back(new PetCats("miku"));
pets.push_back(new PetDogs("da huang"));
for(auto &ptr: pets)
cout <<ptr->get_nickname() << " says " << ptr->talk() << endl;
}
int main() {
test();
}
pets.hpp
#pragma once #include <iostream> #include <string> using std::cout; using std::endl; using std::string; // 机器宠物类：MachinePets（抽象类） class MachinePets { public: MachinePets(const string &s = ""); // 构造函数 virtual string talk() const = 0; // 纯虚函数，作为接口继承 string get_nickname() const; // 获取宠物昵称 protected: string nickname; // 宠物的昵称 }; // MachinePets 构造函数实现 MachinePets::MachinePets(const string &s) : nickname{s} { } // 获取宠物的昵称 string MachinePets::get_nickname() const { return nickname; } // 电子宠物猫类：PetCats class PetCats : public MachinePets { public: PetCats(const string &s = ""); // 构造函数 string talk() const override; // 实现叫声接口 }; // PetCats 构造函数实现 PetCats::PetCats(const string &s) : MachinePets{s} { } // 实现宠物猫的叫声 string PetCats::talk() const { return "Meow"; } // 电子宠物狗类：PetDogs class PetDogs : public MachinePets { public: PetDogs(const string &s = ""); // 构造函数 string talk() const override; // 实现叫声接口 }; // PetDogs 构造函数实现 PetDogs::PetDogs(const string &s) : MachinePets{s} { } // 实现宠物狗的叫声 string PetDogs::talk() const { return "Woof"; }
实验任务四
film.hpp
1 #ifndef FILM_HPP 2 #define FILM_HPP 3 4 #include <iostream> 5 #include <string> 6 using namespace std; 7 8 class Film { 9 private: 10 string title; 11 string director; 12 string country; 13 int year; 14 15 public: 16 Film() : title(""), director(""), country(""), year(0) {} 19 friend istream& operator>>(istream& is, Film& film) { 20 cout << "录入片名: "; 21 is.ignore(); 22 getline(is, film.title); 23 24 cout << "录入导演: "; 25 getline(is, film.director); 26 27 cout << "录入制片国家/地区: "; 28 getline(is, film.country); 29 30 cout << "录入上映年份: "; 31 is >> film.year; 32 33 return is; 34 } 35 37 friend ostream& operator<<(ostream& os, const Film& film) { 38 os << film.title << "\t" << film.director << "\t" << film.country << "\t" << film.year; 39 return os; 40 } 41 43 int get_year() const { 44 return year; 45 } 46 }; 47 49 bool compare_by_year(const Film& a, const Film& b) { 50 return a.get_year() < b.get_year(); 51 } 52 53 #endif // FILM_HPP
film.cpp
#include "film.hpp"
task4.cpp
#include "film.hpp"
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
void test() {
using namespace std;
int n;
cout << "输入电影数目: ";
cin >> n;
cout << "录入" << n << "部影片信息" << endl;
vector<Film> film_lst;
for(int i = 0; i < n; ++i) {
Film f;
cout << string(20, '-') << "第" << i+1 << "部影片录入" << string(20, '-') << endl;
cin >> f;
film_lst.push_back(f);
}
// 按发行年份升序排序
sort(film_lst.begin(), film_lst.end(), compare_by_year);
cout << string(20, '=') + "电影信息(按发行年份)" + string(20, '=')<< endl;
for(auto &f: film_lst)
cout << f << endl;
}
int main() {
test();
}
实验任务5
complex.hpp
#ifndef COMPLEX_HPP
#define COMPLEX_HPP
#include <iostream>
#include <cmath>
using namespace std;
template<typename T>
class Complex {
private:
T real;
T imag;
public:
Complex(T r = 0, T i = 0) : real(r), imag(i) {}
T get_real() const { return real; }
T get_imag() const { return imag; }
Complex& operator+=(const Complex& other) {
real += other.real;
imag += other.imag;
return *this;
}
Complex operator+(const Complex& other) const {
return Complex(real + other.real, imag + other.imag);
}
bool operator==(const Complex& other) const {
return real == other.real && imag == other.imag;
}
friend istream& operator>>(istream& is, Complex& c) {
is >> c.real >> c.imag;
return is;
}
friend ostream& operator<<(ostream& os, const Complex& c) {
os << c.real << (c.imag < 0 ? " - " : " + ") << std::abs(c.imag) << "i";
return os;
}
};
#endif
task5.cpp
#include "Complex.hpp"
#include <iostream>
using std::cin;
using std::cout;
using std::endl;
using std::boolalpha;
void test1() {
Complex<int> c1(2, -5), c2(c1);
cout << "c1 = " << c1 << endl;
cout << "c2 = " << c2 << endl;
cout << "c1 + c2 = " << c1 + c2 << endl;
c1 += c2;
cout << "c1 = " << c1 << endl;
cout << boolalpha << (c1 == c2) << endl;
}
void test2() {
Complex<double> c1, c2;
cout << "Enter c1 and c2: ";
cin >> c1 >> c2;
cout << "c1 = " << c1 << endl;
cout << "c2 = " << c2 << endl;
cout << "c1.real = " << c1.get_real() << endl;
cout << "c1.imag = " << c1.get_imag() << endl;
}
int main() {
cout << "自定义类模板Complex测试1: " << endl;
test1();
cout << endl;
cout << "自定义类模板Complex测试2: " << endl;
test2();
}
实验任务6
account.cpp
#include "account.h"
#include<iostream>
using namespace std;
int main() {
Date date(2008, 11, 1);
SavingsAccount sa1(date, "S3755217", 0.015);
SavingsAccount sa2(date, "02342342", 0.015);
CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
Account* accounts[] = { &sa1, &sa2, &ca };
const int n = sizeof(accounts) / sizeof(Account*);
cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
char cmd;
do {
date.show();
cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
int index, day;
double amount;
string desc;
cin >> cmd;
switch (cmd) {
case 'd':
cin >> index >> amount;
getline(cin, desc);
accounts[index]->deposit(date, amount, desc);
break;
case 'w':
cin >> index >> amount;
getline(cin, desc);
accounts[index]->withdraw(date, amount, desc);
break;
case 's':
for (int i = 0; i < n; i++) {
cout << "[" << i << "]";
accounts[i]->show();
cout << endl;
}
break;
case 'c':
cin >> day;
if (day < date.getDay()) {
cout << "You cannot specify a previous day";
}
else if (day > date.getMaxDay())
cout << "Invalid day";
else date = Date(date.getYear(), date.getMonth(), day);
break;
case 'n':
if (date.getMonth() == 12)
date = Date(date.getYear() + 1, 1, 1);
else
{
date = Date(date.getYear(), date.getMonth() + 1, 1);
}
for (int i = 0; i < n; i++) {
accounts[i]->settle(date);
}
break;
}
} while (cmd != 'e');
return 0;
}
account.h
#pragma once
#include "date.h"
#include "accumulator.h"
#include <string>
using namespace std;
class Account {
private:
string id;
double balance;
static double total;
protected:
Account(const Date& date, const string& id);
void record(const Date& date, double amount, const string& desc);
void error(const string& msg) const;
public:
const string& getId() { return id; }
double getBalance() const { return balance; }
static double getTotal() { return total; }
virtual void deposit(const Date& date, double amount, const string& desc) = 0;
virtual void withdraw(const Date& date, double amount, const string& desc) = 0;
virtual void settle(const Date& date) = 0;
virtual void show() const;
};
class SavingsAccount : public Account {
private:
Accumulator acc;
double rate;
public:
SavingsAccount(const Date& date, const string& id, double rate);
double getRate() const { return rate; }
void deposit(const Date& date, double amount, const string& desc);
void withdraw(const Date& date, double amount, const string& desc);
void settle(const Date& date);
};
class CreditAccount : public Account {
private:
Accumulator acc;
double credit;
double rate;
double fee;
double getDebt() const {
double balance = getBalance();
return (balance < 0 ? balance : 0);
}
public:
CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
double getCredit() const { return credit; }
double getRate() const { return rate; }
double getFee() const { return fee; }
double getAvailableCredit() const {
if (getBalance() < 0) return credit + getBalance();
else return credit;
}
void deposit(const Date& date, double amount, const string& desc);
void withdraw(const Date& date, double amount, const string& desc);
void settle(const Date& date);
void show() const;
};
accumulator.h
#pragma once
#include "date.h"
class Accumulator {
private:
Date lastDate;
double value;
double sum;
public:
double getSum(const Date& date) const {
return sum + value * (date - lastDate);
}
Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{ 0 } {}
void change(const Date& date, double value) {
sum = getSum(date);
lastDate = date;
this->value = value;
}
void reset(const Date& date, double value) {
lastDate = date;
this->value = value;
sum = 0;
}
};
date.cpp
#include "date.h" #include <iostream> #include <cstdlib> using namespace std; namespace { const int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }; } Date::Date(int year, int month, int day) : year(year), month(month), day(day) { if (day <= 0 || day > getMaxDay()) { cout << "Invalid date: "; show(); cout << endl; exit(1); } int years = year - 1; totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day; if (isLeapYear() && month > 2) totalDays++; } int Date::getMaxDay() const { if (isLeapYear() && month == 2) return 29; else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1]; } void Date::show() const { cout << getYear() << "-" << getMonth() << "-" << getDay(); }
date.h
#pragma once class Date { private: int year; int month; int day; int totalDays; public: Date(int year, int month, int day); int getYear() const { return year; } int getMonth() const { return month; } int getDay() const { return day; } int getMaxDay() const; bool isLeapYear() const { return year % 4 == 0 && year % 100 != 0 || year % 400 == 0; } void show() const; int operator-(const Date & date) const { return totalDays - date.totalDays; } };
task6.cpp
#include "account.h" #include<iostream> using namespace std; int main() { Date date(2008, 11, 1); SavingsAccount sa1(date, "S3755217", 0.015); SavingsAccount sa2(date, "02342342", 0.015); CreditAccount ca(date, "C5392394", 10000, 0.0005, 50); Account* accounts[] = { &sa1, &sa2, &ca }; const int n = sizeof(accounts) / sizeof(Account*); cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl; char cmd; do { date.show(); cout << "\tTotal:" << Account::getTotal() << "\tcommand>"; int index, day; double amount; string desc; cin >> cmd; switch (cmd) { case 'd': cin >> index >> amount; getline(cin, desc); accounts[index]->deposit(date, amount, desc); break; case 'w': cin >> index >> amount; getline(cin, desc); accounts[index]->withdraw(date, amount, desc); break; case 's': for (int i = 0; i < n; i++) { cout << "[" << i << "]"; accounts[i]->show(); cout << endl; } break; case 'c': cin >> day; if (day < date.getDay()) { cout << "You cannot specify a previous day"; } else if (day > date.getMaxDay()) cout << "Invalid day"; else date = Date(date.getYear(), date.getMonth(), day); break; case 'n': if (date.getMonth() == 12) date = Date(date.getYear() + 1, 1, 1); else { date = Date(date.getYear(), date.getMonth() + 1, 1); } for (int i = 0; i < n; i++) { accounts[i]->settle(date); } break; } } while (cmd != 'e'); return 0; }
