~cpp 
#include <iostream>
using namespace std;
#include <string> 
 
 
//자판기 클래스 
class VendingMachine 
{ 
private: 
        int _money; 
        int _temp_money; 
        int _select_money, _select_drink, _insert_amount; 
        struct drink 
        { 
                char * name; 
                int price, amount; 
        }; 
        drink s_drink[5]; 
        int _max_num; 
         
public: 
        VendingMachine(); 
        int showMenu();
		void get_money(); 
        void buy(); 
        void takeBack_money(); 
        void insertDrink(); 		
};

int VendingMachine::showMenu()
{
	int choice;
	cout << "\n자판기 입니다\n"; 
	cout << "1.돈을 넣는디\n"; 
	cout << "2.물건을 산다\n"; 
	cout << "3.돈을 거술러 받는다\n"; 
	cout << "4.음료수를 채운다\n"; 
	cout << "0.종료한다\n";  
	cout << "메뉴를 선택하세요 : "; 
	cin >> choice; 
	return choice;
}
 
//자판기의 메뉴를 초기화한다 
VendingMachine::VendingMachine() 
{ 
    _money = _temp_money = 0; 
    _max_num = 5; 

	char * drink_name[] = {"coke", "juice", "tea" , "cofee", "milk"};
	int price[] = {400, 600, 500, 450, 350};

	for(int i = 0 ; i < _max_num ; i++)
	{
		s_drink[i].name = drink_name[i];
		s_drink[i].price = price[i];
		s_drink[i].amount = 10;
	}
} 
         
 
//손님이 돈을 자판기에 넣는다 
void VendingMachine::get_money() 
{ 
    cout << "돈을 넣으세요. 10, 50, 100, 500, 1000만 가능 : "; 
    cin >> _temp_money; 
    if(_temp_money == 10 || _temp_money == 50 || _temp_money == 100 || _temp_money == 500 || _temp_money == 1000) 
            _money = _money + _temp_money; 
    else 
            cout << "10, 50, 100, 500, 1000만 가능합니다. 다시 시작해주세요\n"; 
                     
    cout << _money << "원을 넣었습니다\n"; 
} 
 
//손님이 물건을 산다 
void VendingMachine::buy() 
{       
    cout << "음료수\t\t가격\t수량\n"; 
    cout << "------------------------------------\n"; 
    for(int i = 0 ; i < _max_num ; i++) 
            cout << i + 1 << "."  << s_drink[i].name << "\t\t" << s_drink[i].price << "\t" << s_drink[i].amount << "\n"; 
     
    cout << "\n현재 " << _money << "원이 있어요\n"; 
    cout << "원하는 음료수를 선택하세요 : "; 
    cin >> _select_drink; 
    if((_money - s_drink[_select_drink - 1].price) >= 0 && s_drink[_select_drink - 1].amount >= 1) 
    { 
            s_drink[_select_drink - 1].amount--; 
            _money = _money - s_drink[_select_drink - 1].price; 
    } 
    else
		cout << "잔액이 부족하거나 수량이 부족해요\n";
	
	cout << _money << "원이 남았어요\n"; 
} 
 
//손님의 거스름돈을 내어준다 
void VendingMachine::takeBack_money() 
{
	cout << "거스름돈" << _money << "원을 돌려드립니다\n"; 
    _money = 0; 
} 
 
//음료수를 채운다 
void VendingMachine::insertDrink() 
{ 
    for(int i = 0 ; i < _max_num ; i++) 
            cout << i + 1 << "." << s_drink[i].name << "\t" << s_drink[i].amount << "\n"; 
    cout << "채우길 원하는 음료수를 선택하세요 : "; 
    cin >> _select_drink; 
    cout << "채우길 원하는 음료수 수량을 입력해주세요 : "; 
    cin >> _insert_amount; 
	s_drink[_select_drink - 1].amount += _insert_amount; 
    cout << "음료수를 채웠습니다\n"; 
    for(i = 0 ; i < _max_num ; i++) 
            cout << i + 1 << "." << s_drink[i].name << "\t" << s_drink[i].amount << "\n"; 
} 
 
int main() 
{ 

    VendingMachine VendingMachine; 

    int choice = VendingMachine.showMenu();

	while(choice != 0)
	{
		if( choice >= 0 || choice <= 4)
		{
			switch(choice) 
			{ 
			case 1: 
					VendingMachine.get_money(); 
					break; 
			case 2: 
					VendingMachine.buy(); 
					break; 
			case 3: 
					VendingMachine.takeBack_money(); 
					break; 
			case 4: 
					VendingMachine.insertDrink(); 
					break; 
			case 0: 
					cout << "자판기를 종료합니다!!\n\n";  
					break; 
			}
		}			
		else
			cout << "잘못된 입력입니다. 다시 입력해주세요 : ";

		choice = VendingMachine.showMenu();	
	}

	return 0; 
}