[C,C++] 윤성우 열혈 C++ 프로그래밍 OOP 단계별 프로젝트 01단계

#include <iostream>
#include <cstring>            //strcpy 사용하기 위해
 
using namespace std;
const int NAME_LEN = 20;
 
void ShowMenu(void);
void MakeAccount(void);
void DepositMoney(void);
void WithdrawMOney(void);
void ShowAllAccInfo(void);
 
enum {MAKE=1,DEPOSIT,WITHDRAW,INQUIRE,EXIT};
 
typedef struct
{
    int accID;                //계좌 번호
    int balance;            //잔     액
    char cusName[NAME_LEN];    //고객 이름
}Account;
 
Account accArr[100];
int accNum = 0;
 
int main(void)
{
    int sel;
    while(1)
    {
        ShowMenu();
        cin >> sel;
        switch (sel)
        {
        case MAKE:
            MakeAccount();
            break;            //중요!!
        case DEPOSIT:
            DepositMoney();
            break;
        case WITHDRAW:
            WithdrawMOney();
            break;
        case INQUIRE:
            ShowAllAccInfo();
            break;
        case EXIT:
            return 0;
        default:
            cout << "Illegal selection.." << endl;
        }
    }
    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;
    cout << "선택 : ";
    
}
 
void MakeAccount(void)
{ 
    int id;
    char name[NAME_LEN];
    int balance;
 
    cout << "[계좌개설]" << endl;
    cout << "계좌  ID : ";
    cin >> id;
    cout << "이    름 : ";
    cin >> name;
    cout << "입 금 액 : ";
    cin >> balance;
 
    accArr[accNum].accID = id;
    accArr[accNum].balance = balance;
    strcpy(accArr[accNum].cusName, name);
    accNum++;
}
 
void DepositMoney(void) 
{
    int money;
    int id;
    cout << "[입   금]" << endl;
    cout << "계좌 ID : ";
    cin >> id;
    cout << "입금액 : ";
    cin >> money;
 
    for (int i = 0; i < accNum; i++)
    {
        if (accArr[i].accID == id)
        {
            accArr[i].balance += 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 << "계좌 ID : ";
    cin >> id;
    cout << "출금액 : ";
    cin >> money;
 
    for (int i = 0; i < accNum; i++)
    {
        if (accArr[i].accID == id)
        {
            if (accArr[i].balance < money)
            {
                cout << "잔액부족" << endl << endl;
                return;
            }
            accArr[i].balance -= money;
            cout << "출금완료" << endl << endl;
            return;
        }
    }
    cout << "유효하지 않은 ID 입니다." << endl << endl;
}
void ShowAllAccInfo(void) 
{
    for (int i = 0; i < accNum; i++)
    {
        cout << "계좌ID: " << accArr[i].accID << endl;
        cout << "이  름: " << accArr[i].cusName << endl;
        cout << "잔  액: " << accArr[i].balance << endl<<endl;
    }
}