C++ Chapter 04. 클래스의 완성. 04-5 OOP 단계별 프로젝트 02단계

/*
 * Banking System Ver 0.2
 * 작성자: 윤성우
 * 내  용: Account 클래스 정의, 객체 포인터 배열 적용
 */
 
#include <iostream>
#include <cstring>
 
using namespace std;
const int NAME_LEN=20;
 
void ShowMenu(void);       // 메뉴출력
void MakeAccount(void);    // 계좌개설을 위한 함수
void DepositMoney(void);       // 입    금
void WithdrawMoney(void);      // 출    금
void ShowAllAccInfo(void);     // 잔액조회
 
enum {MAKE=1, DEPOSIT, WITHDRAW, INQUIRE, EXIT};
 
class Account
{
private:
    int accID;      // 계좌번호
    int balance;    // 잔    액
    char * cusName;   // 고객이름
 
public:
    Account(int ID, int money, char * name)
        : accID(ID), balance(money)
    {
        cusName=new char[strlen(name)+1];
        strcpy(cusName, name);
    }
 
    int GetAccID() { return accID; }
 
    void Deposit(int money)
    {
        balance+=money;
    }
 
    int Withdraw(int money)    // 출금액 반환, 부족 시 0
    {
        if(balance<money)
            return 0;
        
        balance-=money;
        return money;
    }
 
    void ShowAccInfo()
    {
        cout<<"계좌ID: "<<accID<<endl;
        cout<<"이  름: "<<cusName<<endl;
        cout<<"잔  액: "<<balance<<endl;
    }
 
    ~Account()
    {
        delete []cusName;
    }    
};
 
Account * accArr[100];   // Account 저장을 위한 배열
int accNum=0;        // 저장된 Account 수
 
int main(void)
{
    int choice;
    
    while(1)
    {
        ShowMenu();
        cout<<"선택: "; 
        cin>>choice;
        cout<<endl;
        
        switch(choice)
        {
        case MAKE:
            MakeAccount(); 
            break;
        case DEPOSIT:
            DepositMoney(); 
            break;
        case WITHDRAW: 
            WithdrawMoney(); 
            break;
        case INQUIRE:
            ShowAllAccInfo(); 
            break;
        case EXIT:
            return 0;
        default:
            cout<<"Illegal selection.."<<endl;
        }
    }
 
    for(int i=0; i<accNum; i++)
        delete accArr[i];
    return 0;
}
 
void ShowMenu(void)
{
    cout<<"-----Menu------"<<endl;
    cout<<"1. 계좌개설"<<endl;
    cout<<"2. 입    금"<<endl;
    cout<<"3. 출    금"<<endl;
    cout<<"4. 계좌정보 전체 출력"<<endl;
    cout<<"5. 프로그램 종료"<<endl;
}
 
void MakeAccount(void) 
{
    int id;
    char name[NAME_LEN];
    int balance;
    
    cout<<"[계좌개설]"<<endl;
    cout<<"계좌ID: ";    cin>>id;
    cout<<"이  름: ";    cin>>name;
    cout<<"입금액: ";    cin>>balance;
    cout<<endl;
 
    accArr[accNum++]=new Account(id, balance, name);
}
 
void DepositMoney(void)
{
    int money;
    int id;
    cout<<"[입    금]"<<endl;
    cout<<"계좌ID: ";    cin>>id;
    cout<<"입금액: ";    cin>>money;
    
    for(int i=0; i<accNum; i++)
    {
        if(accArr[i]->GetAccID()==id)
        {
            accArr[i]->Deposit(money);
            cout<<"입금완료"<<endl<<endl;
            return;
        }
    }
    cout<<"유효하지 않은 ID 입니다."<<endl<<endl;
}
 
void WithdrawMoney(void)
{
    int money;
    int id;
    cout<<"[출    금]"<<endl;
    cout<<"계좌ID: ";    cin>>id;
    cout<<"출금액: ";    cin>>money;
    
    for(int i=0; i<accNum; i++)
    {
        if(accArr[i]->GetAccID()==id)
        {
            if(accArr[i]->Withdraw(money)==0)
            {
                cout<<"잔액부족"<<endl<<endl;
                return;
            }
 
            cout<<"출금완료"<<endl<<endl;
            return;
        }
    }
    cout<<"유효하지 않은 ID 입니다."<<endl<<endl;
}
 
void ShowAllAccInfo(void)    
{
    for(int i=0; i<accNum; i++)
    {
        accArr[i]->ShowAccInfo();
        cout<<endl;
    }
}