task3：
pets.hpp
#pragma once
#include<iostream>
using namespace std;
class MachinePets {
public:
MachinePets(const string& s) :nickname{ s } {}
virtual string talk()const = 0;
string get_nickname() const {
return nickname;
}
private:
string nickname;
};
class PetCats :public MachinePets {
public:
PetCats(const string& s) :MachinePets{ s } {}
string talk()const {
return "miao wu~";
}
};
class PetDogs :public MachinePets {
public:
PetDogs(const string& s) :MachinePets{ s } {}
string talk()const {
return "wang wang~";
}
};
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task.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();
}
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task4：
film.hpp
#pragma once
#include<iostream>
#include<iomanip>
using namespace std;
class Film {
public:
Film() {
this->name = name;
this->director = director;
this->country = country;
this->year = year;
}
friend istream &operator>>(istream &in, Film &c) {
cout << "录入片名:";
in >> c.name;
cout << "录入导演:";
in >> c.director;
cout << "录入国家/地区:";
in >> c.country;;
cout << "录入时间:";
in >> c.year;
return in;
}
friend ostream& operator<<(ostream& out, Film& c) {
out << c.name <<setw(20) <<c.director<< setw(20) << c.country <<setw(20)<< c.year;
return out;
}
Film(const string& name, const string& director, const string& country, const string& year) {
this->name = name;
this->director = director;
this->country = country;
this->year = year;
}
string get_year() const{
return year;
}
private:
string name,director,country,year;
};
bool compare_by_year(Film& c1, Film& c2) {
if (c1.get_year() < c2.get_year()) return true;
return false;
}
View Code
task.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();
}
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实验结果：
task5：
complex.hpp
#pragma once
#include<iostream>
#include<string>
using namespace std;
template<typename T>
class Complex {
public:
Complex() :real{0},imag{0}{}
Complex(const T &x0,const T &y0) :real{ x0 }, imag{ y0 } {}
friend ostream& operator<<(ostream& out,const Complex &c) {
if (c.imag > 0) {
cout << c.real << " + " << c.imag << "i" << endl;
return out;
}
else if (c.imag< 0) {
cout << c.real << " - " << -c.imag << "i" << endl;
return out;
}
else cout << c.real << endl;
return out;
}
friend istream& operator>>(istream& in, Complex& c) {
cin >> c.real >> c.imag;
return in;
}
friend Complex operator+(const Complex& c1,const Complex& c2) {
return Complex<T>(c1.real + c2.real, c1.imag + c2.imag);
}
void operator+=(Complex& c2) {
real += c2.real;
imag += c2.imag;
}
friend bool operator==(Complex& c1, Complex& c2) {
if (c1.real == c2.real && c1.imag == c2.imag)return true;
return false;
}
T get_real()const {
return real;
}
T get_imag()const {
return imag;
}
private:
T imag, real;
};
View Code
task.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();
}
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task6：
date.h
#pragma once
class Date {
private:
int year, month, day, 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;
}
};
View Code
date.cpp
#include"date.h"
#include<iostream>
#include<cstdlib>
using namespace std;
namespace {
const int DAYS_BEFIRE_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_BEFIRE_MONTH[month - 1] + day;
if (isLeapYear() && month > 2) totalDays++;
}
int Date::getMaxDay()const {
if (isLeapYear() && month == 2)
return 29;
else return DAYS_BEFIRE_MONTH[month] - DAYS_BEFIRE_MONTH[month - 1];
}
void Date::show()const {
cout << getYear() << "-" << getMonth() << "-" << getDay();
}
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account.h
#include"date.h"
#include<iostream>
#include<cstdlib>
using namespace std;
namespace {
const int DAYS_BEFIRE_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_BEFIRE_MONTH[month - 1] + day;
if (isLeapYear() && month > 2) totalDays++;
}
int Date::getMaxDay()const {
if (isLeapYear() && month == 2)
return 29;
else return DAYS_BEFIRE_MONTH[month] - DAYS_BEFIRE_MONTH[month - 1];
}
void Date::show()const {
cout << getYear() << "-" << getMonth() << "-" << getDay();
}
View Code
account.cpp
#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 enouogh 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();
}
View Code
accumulator.h
#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;
sum = 0;
}
};
View Code
main.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;
}
View Code
结果：
标签：const,cout,int,实验,date,return,include From： https://www.cnblogs.com/bearrrr/p/18581814