实验任务3
pets.hpp源码
#pragma once
#include<iostream>
#include<string>
using namespace std;
class MachinePets{
private:
string nickname;
public:
MachinePets(const string &s):nickname(s){}
const string &get_nickname() const{
return nickname;
}
virtual string talk() const=0;
};
class PetCats:public MachinePets{
public:
PetCats(const string &a):MachinePets(a) {}
string talk() const override{
return "喵";
}
};
class PetDogs:public MachinePets{
public:
PetDogs(const string &b):MachinePets(b) {}
string talk() const override{
return "汪";
}
};
task3.cpp源码
#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();
}
运行测试截图
实验任务4
film.hpp源码
#pragma once
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class Film{
private:
string title;
string director;
string country;
int year;
public:
Film(const string &title=" ",const string &director=" ",const string &country=" ",int year=0);
friend istream& operator>>(istream &is,Film &f);
friend ostream& operator<<(ostream &os,const Film &f);
int get_year() const
{
return year;
}
};
Film::Film(const string &title, const string &director, const string &country, int year){
this->title=title;
this->director=director;
this->country=country;
this->year=year;
}
istream& operator>>(istream &is,Film &f){
cout<<"录入片名：";
is.ignore();
getline(is,f.title);
cout<<"录入导演：";
getline(is,f.director);
cout<<"录入制片国家/地区：";
getline(is,f.country);
cout<<"录入上映年份：" ;
is>>f.year;
return is;
}
ostream& operator<<(ostream &os,const Film &f){
os << left;
os << setw(15) <<f.title
<< setw(15) <<f.director
<< setw(15) <<f.country
<< setw(15) <<f.year;
return os;
}
bool compare_by_year(const Film &f1,const Film &f2){
return f1.get_year()<f2.get_year();
}
task4.cpp源码
#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();
}
运行结果截图
实验任务五
Complex.hpp源码
#pragma once
#include<iostream>
#include<string>
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) {}
Complex(const Complex<T>& other):real(other.real),imag(other.imag){}
T get_real() const{return real;}
T get_imag() const{return imag;}
Complex<T> &operator+=(const Complex<T>& other){
real+=other.real;
imag+=other.imag;
return *this;
}
Complex<T> operator+(const Complex<T>& other) const{
return Complex<T>(real+other.real,imag+other.imag);
}
bool operator==(const Complex<T>&other) const{
return real==other.real&&imag==other.imag;
}
friend istream& operator>>(istream &is,Complex<T>& c){
is>>c.real>>c.imag;
return is;
}
friend ostream& operator<<(ostream& os, const Complex<T>& c){
if(c.imag>=0){
os<<c.real<<"+"<<c.imag<<"i";
}
else{
os<<c.real<<c.imag<<"i";
}
return os;
}
};
task5.cpp源码
#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();
}
运行测试截图
实验任务6
date.h源码
#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;
}
};
date.cpp源码
#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();
}
accumulator.h源码
#pragma once
#include "date.h"
class Accumulator {
private:
Date lastDate;
double value;
double sum;
public:
Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{ 0 } {}
double getSum(const Date& date) const {
return sum + value * (date - lastDate);
}
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;
}
};
account.h源码
#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;
};
account.cpp源码
#include "account.h"
#include <cmath>
#include<iostream>
using namespace std;
double Account::total = 0;
Account::Account(const Date& date, const string& id) : id(id), balance(0) {
date.show();
cout << "\t#" << id << " created" << endl;
}
void Account::record(const Date& date, double amount, const string& desc) {
amount = floor(amount * 100 + 0.5) / 100;
balance += amount;
total += amount;
date.show();
cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
}
void Account::show() const {
cout << id << "\tBalance: " << balance;
}
void Account::error(const string& msg) const {
cout << "Error (#" << id << "): " << msg << endl;
}
SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate)
: Account(date, id), rate(rate), acc(date, 0) {}
void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
record(date, amount, desc);
acc.change(date, getBalance());
}
void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
if (amount > getBalance()) {
error("not enough money");
}
else {
record(date, -amount, desc);
acc.change(date, getBalance());
}
}
void SavingsAccount::settle(const Date& date) {
double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
if (interest != 0) record(date, interest, "interest");
acc.reset(date, getBalance());
}
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) {}
void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
record(date, amount, desc);
acc.change(date, getDebt());
}
void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
if (amount - getBalance() > credit) {
error("not enough credit");
}
else {
record(date, -amount, desc);
acc.change(date, getDebt());
}
}
void CreditAccount::settle(const Date& date) {
double interest = acc.getSum(date) * rate;
if (interest != 0) record(date, interest, "interest");
if (date.getMonth() == 1) record(date, -fee, "annual fee");
acc.reset(date, getDebt());
}
void CreditAccount::show() const {
Account::show();
cout << "\tAvailable credit: " << getAvailableCredit();
}
8_8.cpp源码
#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;
}
运行测试截图
