Class 활용 예제

 

 

1. (객체 생성 및 초기화)

#include <iostream>
using namespace std;

class Fruitseller
{
private:
	int APPLE_PRICE;
	int numOfApples;
	int myMoney;
public:
	void InitMembers(int price, int num, int money)
	{
		APPLE_PRICE = price;
		numOfApples = num;
		myMoney = money;
	}
	int SaleApples(int money)
	{
		int num = money / APPLE_PRICE;
		numOfApples -= num;
		myMoney += money;
		return num;
	}
	void ShowSalesResult()
	{
		cout << "남은 사과: " << numOfApples << endl;
		cout << "판매 수익: " << myMoney << endl << endl;
	}
};

class FruitBuyer
{
	int myMoney;
	int numOfApples;

public:
	void InitMembers(int money)
	{
		myMoney = money;
		numOfApples = 0;
	}
	void BuyApples(Fruitseller& seller, int money)
	{
		numOfApples += seller.SaleApples(money);
		myMoney -= money;
	}
	void ShowBuyResult()
	{
		cout << "현재 잔액: " << myMoney << endl;
		cout << "사과 개수: " << numOfApples << endl << endl;
	}
};

int main()
{
	Fruitseller seller1;
	seller1.InitMembers(1000, 20, 0);
	FruitBuyer buyer;
	buyer.InitMembers(5000);
	buyer.BuyApples(seller1, 2000);

	cout << "과일 판매자의 현황" << endl;
	seller1.ShowSalesResult();
	cout << "과일 구매자의 현황" << endl;
	buyer.ShowBuyResult();
	return 0;
}

2. (생성자 활용)

#include <iostream>
using namespace std;

class FruitSeller
{
private:
	int APPLE_PRICE;
	int numOfApples;
	int myMoney;
public:
	FruitSeller(int price, int num, int money)
	{
		APPLE_PRICE = price;
		numOfApples = num;
		myMoney = money;
	}
	int SaleApples(int money)
	{
		int num = money / APPLE_PRICE;
		numOfApples -= num;
		myMoney += money;
		return num;
	}
	void ShowSalesResult()
	{
		cout << "남은 사과: " << numOfApples << endl;
		cout << "판매 수익: " << myMoney << endl << endl;
	}
};

class FruitBuyer
{
	int myMoney;
	int numOfApples;

public:
	FruitBuyer(int money)
	{
		myMoney = money;
		numOfApples = 0;
	}
	void BuyApples(FruitSeller& seller, int money)
	{
		numOfApples += seller.SaleApples(money);
		myMoney -= money;
	}
	void ShowBuyResult()
	{
		cout << "현재 잔액: " << myMoney << endl;
		cout << "사과 개수: " << numOfApples << endl << endl;
	}
};

int main()
{
	FruitSeller seller(1000, 20, 0);
	FruitBuyer buyer(5000);
	
	buyer.BuyApples(seller, 2000);
	cout << "과일 판매자의 현황" << endl;
	seller.ShowSalesResult();
	cout << "과일 구매자의 현황" << endl;
	buyer.ShowBuyResult();
	return 0;
}

3. (이니셜라이저를 이용한 const 멤버변수 초기화)

#include <iostream>
using namespace std;

class FruitSeller
{
private:
	const int APPLE_PRICE;
	int numOfApples;
	int myMoney;
public:
	FruitSeller(int price, int num, int money)
		:APPLE_PRICE(price),numOfApples(num),myMoney(money)
	{
		
	}
	int SaleApples(int money)
	{
		int num = money / APPLE_PRICE;
		numOfApples -= num;
		myMoney += money;
		return num;
	}
	void ShowSalesResult()
	{
		cout << "남은 사과: " << numOfApples << endl;
		cout << "판매 수익: " << myMoney << endl << endl;
	}
};

class FruitBuyer
{
	int myMoney;
	int numOfApples;

public:
	FruitBuyer(int money)
		:myMoney(money),numOfApples(0)
	{
		
	}
	void BuyApples(FruitSeller& seller, int money)
	{
		numOfApples += seller.SaleApples(money);
		myMoney -= money;
	}
	void ShowBuyResult()
	{
		cout << "현재 잔액: " << myMoney << endl;
		cout << "사과 개수: " << numOfApples << endl << endl;
	}
};

int main()
{
	FruitSeller seller(1000, 20, 0);
	FruitBuyer buyer(5000);

	buyer.BuyApples(seller, 2000);
	cout << "과일 판매자의 현황" << endl;
	seller.ShowSalesResult();
	cout << "과일 구매자의 현황" << endl;
	buyer.ShowBuyResult();
	return 0;
}

APPLE_PRICE는 const로 선언이 가능하며 이는 이니셜라이저를 이용하여 선언과 동시에 초기화 할 수 있다.