소스 ¶

~cpp 
#include<iostream.h>

class supermarket
{
private:
	int money;
	int max_num;
	struct product{
		char * name;
		int cost;
		int quanty;
	};
	product s_product[3];

public:
	supermarket();
	void Deposit();
	void Buy();
	void Inventory();
	void Cancle();
    void Mymoney();
};

supermarket::supermarket()
{
	money = 0;
	max_num = 3;

	s_product[0].name = "캔디";
	s_product[0].cost = 1000;
	s_product[1].name = "디스켓";
	s_product[1].cost = 1200;
	s_product[2].name = "마우스";
	s_product[2].cost = 5000;
	s_product[0].quanty = s_product[1].quanty = s_product[2].quanty = 0;
}

//돈을 입금
void supermarket::Deposit()
{
	int temp;
	cout << "돈을 입금하게요 : ";
	cin >> temp;
	money = money + temp;
}

//물건을 산다
void supermarket::Buy()
{
	
	int choice;
	int quanty;

	for(int i = 0 ; i < max_num ; i++)
		cout << i + 1 << ". " << s_product[i].name << "\t" << s_product[i].cost << "\n";
	cout << "사실 물건 선택 : ";
	cin >> choice;
	cout << "수량 입력: ";
	cin >> quanty;
	
	if(choice == 1 && (money - (s_product[0].cost * quanty)) >= 0 )
	{
		s_product[0].quanty += quanty;
		money = money - (s_product[0].cost * quanty);
	}
	else if(choice == 2  && (money - (s_product[1].cost * quanty)) >= 0)
	{
		s_product[1].quanty += quanty;
		money = money - (s_product[1].cost * quanty);
	}
    else if(choice == 3 && (money - (s_product[2].cost * quanty)) >= 0)
	{
		s_product[2].quanty += quanty;
		money = money - (s_product[2].cost * quanty);
	}
	else 
		cout << "돈이 부족합니다\n";
}

//산 물건을 보여준다
void supermarket::Inventory()
{
	for(int i = 0 ; i < max_num ; i++)
		cout << s_product[i].name << "\t" << s_product[i].quanty << "\n";
}

//산 물건을 취소한다
void supermarket::Cancle()
{
	int choice;
	int quanty;

	cout << "취소할  물건 선택 : ";
	cin >> choice;
	cout << "수량 입력: ";
	cin >> quanty;
	
	if(choice == 1 && (s_product[0].quanty - quanty) >= 0 )
	{
		s_product[0].quanty = s_product[0].quanty - quanty;
		money = money + (s_product[0].cost * quanty);
	}
	else if(choice == 2 && (s_product[1].quanty - quanty) >= 0 )
	{
		s_product[1].quanty = s_product[1].quanty - quanty;
		money = money + (s_product[1].cost * quanty);
	}
	else if(choice == 3 && (s_product[2].quanty - quanty) >= 0 )
	{
		s_product[2].quanty = s_product[2].quanty - quanty;
		money = money + (s_product[2].cost * quanty);
	}
	else
		cout << "잘못된 수량입력입니다\n";
}

//남은 돈을 보여준다
void supermarket::Mymoney()
{
	cout << "남은 돈: " << money << "\n";
}

int main()
{
	int choice = 0;
	supermarket market;

	cout << "메인메뉴\n";
	cout << "1. 돈 예금\n";
	cout << "2. 물건 사기\n";
	cout << "3. 산 물건 목록 보여주기\n";
	cout << "4. 산 물건 취소하기\n";
	cout << "5. 가게 나기기\n";
	market.Mymoney();
	cout << "메뉴선택 : ";
	cin >> choice;

	while(choice != 5)
	{
		switch(choice)
		{
		case 1:
			market.Deposit();
		    break;
		case 2:
			market.Buy();

			break;
		case 3:
			market.Inventory();
			break;
		case 4:
			market.Cancle();
			break;
		}
		cout << "\n\n메인메뉴\n";
     	cout << "1. 돈 예금\n";
		cout << "2. 물건 사기\n";
		cout << "3. 산 물건 목록 보여주기\n";
		cout << "4. 산 물건 취소하기\n";
		cout << "5. 가게 나기기\n";
	    market.Mymoney();
		cout << "메뉴선택 : ";
        cin >> choice;
	}

	return 0;

}