객체지향 프로그래밍 연습(상속, 가상함수) - Part 1

class 부모클래스 { public: void 공통기능() { std::cout << "모든 자식에게 공통!" << std::endl; } }; class 자식클래스 : public 부모클래스 { public: void 고유기능() { std::cout << "자식 고유 기능" << std::endl; } };

#include <iostream> using namespace std; class Animal { public: void Eat() { cout << "먹는다" << endl; } }; class Dog : public Animal { public: void Bark() { cout << "멍멍!" << endl; } }; class Cat : public Animal { public: void Bark() { cout << "야옹" << endl; } }; int main() { Dog d; d.Eat(); // Animal의 함수 호출 d.Bark(); // Dog 고유 함수 호출 Cat c; c.Eat(); // Animal의 함수 호출 c.Bark(); // Cat 고유 함수 호출S return 0; }

class Animal { public: void Speak() { std::cout << "???"; } }; class Cat : public Animal { public: void Speak() { std::cout << "야옹!"; } };

#include <iostream> #include <cstring> #pragma warning(disable: 4996) using std::cout; using std::cin; using std::endl; class AAA { private: int num1; public: virtual void Func1() { cout << "Func1" << endl; } virtual void Func2() { cout << "Func2" << endl; } }; class BBB : public AAA { private: int num2; public: virtual void Func1() { cout << "BBB::Func1" << endl; } void Func3() { cout << "Func3" << endl; } }; int main() { AAA* aptr = new AAA(); aptr->Func1(); BBB* bptr = new BBB(); bptr->Func1(); return 0; }

class Shape { public: virtual double Area() const = 0; // 순수 가상 함수 }; class Circle : public Shape { double radius; public: Circle(double r) : radius(r) {} double Area() const override { return 3.14 * radius * radius; } };

Dog d1("Baekgu"); Cat c1("Nabi"); Animal* animals[] = { &d1, &c1 }; for (int i = 0; i < 2; ++i) animals[i]->Speak();

Circle c(3.0); Rectangle r(4.0, 2.0); Shape* shapes[] = { &c, &r }; for (int i = 0; i < 2; ++i) std::cout << shapes[i]->Area() << std::endl;

Manager m("Kim", 5000); Developer d("Lee", 3000); Employee* staff[] = { &m, &d }; for (int i = 0; i < 2; ++i) std::cout << staff[i]->CalculateSalary() << std::endl;

Piano p; Guitar g; Instrument* instruments[] = { &p, &g }; for (int i = 0; i < 2; ++i) instruments[i]->Play();

Knight k("Arthur"); Mage m2("Merlin"); Character* party[] = { &k, &m2 }; for (int i = 0; i < 2; ++i) party[i]->Attack();

SmartLight sl; SmartSpeaker ss; SmartDevice* devices[] = { &sl, &ss }; for (int i = 0; i < 2; ++i) devices[i]->Execute("turn on");

Warrior w("Thor"); Archer a("Robin"); Unit* units[] = { &w, &a }; for (int i = 0; i < 2; ++i) units[i]->Move();

EmailNotification e("kim@example.com"); SMSNotification s("010-1234-5678"); Notification* notices[] = { &e, &s }; for (int i = 0; i < 2; ++i) notices[i]->Send();

Goblin g("Goblin", 50); Orc o("Orc", 100); Monster* monsters[] = { &g, &o }; for (int i = 0; i < 2; ++i) monsters[i]->Attack();

CreditCard cc(10000); Cash cash(5000); Payment* payments[] = { &cc, &cash }; for (int i = 0; i < 2; ++i) payments[i]->Process();

Running run(30); Cycling cyc(60); Exercise* logs[] = { &run, &cyc }; for (int i = 0; i < 2; ++i) logs[i]->PrintCalories();

EBook eb("Clean Code", "Robert Martin", 5.2); PaperBook pb("Refactoring", "Martin Fowler", 450); Book* books[] = { &eb, &pb }; for (int i = 0; i < 2; ++i) books[i]->Display();

Warrior w("Gorath", 100, 30); Wizard wiz("Azura", 80, 50); Character* party[] = { &w, &wiz }; for (int i = 0; i < 2; ++i) party[i]->ShowStatus();

Car c; Motorcycle m; Vehicle* vehicles[] = { &c, &m }; for (int i = 0; i < 2; ++i) { vehicles[i]->StartEngine(); vehicles[i]->Drive(); vehicles[i]->StopEngine(); }

Weapon sword("Iron Sword", 100, 25); Potion hp("Health Potion", 50, 30); Item* items[] = { &sword, &hp }; for (int i = 0; i < 2; ++i) items[i]->GetInfo();

SavingsAccount sa(1000, 0.03); CheckingAccount ca(2000, 1.5); Account* accounts[] = { &sa, &ca }; for (int i = 0; i < 2; ++i) { accounts[i]->Deposit(500); accounts[i]->Withdraw(200); accounts[i]->ShowBalance(); }

Soda soda("Coke", 1500); Juice juice("Orange", 2000); Drink* drinks[] = { &soda, &juice }; for (int i = 0; i < 2; ++i) drinks[i]->Dispense();

Taxi taxi(5); Bus bus(5); Transport* transports[] = { &taxi, &bus }; for (int i = 0; i < 2; ++i) std::cout << transports[i]->CalculateFare() << std::endl;

UndergraduateStudent us("Kim", 92); GraduateStudent gs("Lee", 92); Student* students[] = { &us, &gs }; for (int i = 0; i < 2; ++i) std::cout << students[i]->GetGrade() << std::endl;

CleaningRobot cr("Roomba"); DeliveryRobot dr("DeliveryBot"); Robot* robots[] = { &cr, &dr }; for (int i = 0; i < 2; ++i) { robots[i]->Move(); robots[i]->Work(); }

Circle c(5.0); Square s(4.0); Shape* shapes[] = { &c, &s }; for (int i = 0; i < 2; ++i) std::cout << shapes[i]->Area() << std::endl;

Rectangle r(4, 5); Circle c(3); Triangle t(3, 4, 5); // Rectangle 상속 Shape* shapes[] = { &r, &c, &t }; for (int i = 0; i < 3; ++i) { std::cout << "Area: " << shapes[i]->Area() << std::endl; std::cout << "Perimeter: " << shapes[i]->Perimeter() << std::endl; }

Smartphone sp("Galaxy"); SmartWatch sw("Apple Watch"); Device* devices[] = { &sp, &sw }; for (int i = 0; i < 2; ++i) { devices[i]->PowerOn(); devices[i]->ShowInfo(); devices[i]->PowerOff(); }

Circle c(5); Rectangle r(4, 3); IDrawable* drawables[] = { &c, &r }; for (int i = 0; i < 2; ++i) drawables[i]->Draw();

Player p("Hero"); Enemy e("Goblin"); IRenderable* renderables[] = { &p, &e }; IUpdatable* updatables[] = { &p, &e }; for (int i = 0; i < 2; ++i) { updatables[i]->Update(); renderables[i]->Render(); }