[열혈 C++] OOP 단계별 프로젝트 04단계 : const

🔭프로그램 설명

• 클래스 Account에 cosnt선언을 추가하여 코드의 안정성을 높여보고자 한다.

🖥️구현

/*
 * Banking System Ver 0.4
 * author : YEJIN LEE
 * contents : const로 안정성 높이기
 */

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;

enum { DEPOSIT = 1, WITHDRAW, CREATE, INQUIRY, EXIT };
const int NAME_LEN = 10;

///////////////////// 계좌 /////////////////////////

class Account
{
public:
	Account(int id, char* name, int balance);
	~Account();

private:
	int m_Id;			// 계좌번호
	char* m_cpName;		// 이름
	int m_Balance;		// 잔고

public:
	int getID() const;
	int getBalance() const;
	char* getName() const;
	void changeBalance(int money);
};


Account::Account(int id, char* name, int balance) : m_Id(id), m_Balance(balance)
{
	m_cpName = new char[strlen(name) + 1];
	strcpy(m_cpName, name);
}

Account::~Account()
{
	delete[]m_cpName;
}

int Account::getID() const {
	return m_Id;
}

int Account::getBalance() const {
	return m_Balance;
}

char* Account::getName() const {
	return m_cpName;
}

void Account::changeBalance(int money) {
	m_Balance = money;
}




//////////////////// 은행 //////////////////////

class BankSystem
{
public:
	BankSystem();
	~BankSystem();

private:
	int m_NumOfAcc;				// 계좌 개수
	Account* m_pAccs[50];		// 계좌 배열

public:
	void AnnounceSys();			// 시스템 안내
	void CreateAccount();		// 계좌 개설
	void DepositMoney();		// 입금
	void WithdrawMoney();		// 출금
	void InquiryAcc() const;	// 잔액조회

};

BankSystem::BankSystem() : m_NumOfAcc(0)
{
}

BankSystem::~BankSystem()
{
	delete[]m_pAccs;
}

void BankSystem::AnnounceSys() {

	cout << "----- Menu -----" << endl;
	cout << "1. 입    금" << endl;
	cout << "2. 출    금" << endl;
	cout << "3. 개    설" << endl;
	cout << "4. 계좌정보" << endl;
	cout << "5. 종    료" << endl;

}

void BankSystem::CreateAccount() {

	int id;
	char name[NAME_LEN];
	int money;

	cout << "계좌번호 : " << endl; cin >> id;
	cout << "이    름 : " << endl; cin >> name;
	cout << "잔    액 : " << endl; cin >> money;

	m_pAccs[m_NumOfAcc++] = new Account(id, name, money);

}

void BankSystem::DepositMoney() {

	int id;
	int money;

	cout << "[입금]" << endl;
	cout << "계좌번호 : "; cin >> id;
	cout << "입금액 : "; cin >> money;

	for (int i = 0; i < m_NumOfAcc; i++) {
		if (m_pAccs[i]->getID() == id) {
			int retMoney = m_pAccs[i]->getBalance();
			retMoney += money;
			m_pAccs[i]->changeBalance(retMoney);

			cout << "잔액 : " << m_pAccs[i]->getBalance() << endl << endl;
			return;
		}
	}

	cout << "해당 계좌가 존재하지 않습니다" << endl << endl;
	return;
}

void BankSystem::WithdrawMoney() {
	int id;
	int money;

	cout << "[출금]" << endl;
	cout << "계좌 ID : "; cin >> id;
	cout << "출금액 : "; cin >> money;

	for (int i = 0; i < m_NumOfAcc; i++) {
		if (m_pAccs[i]->getID() == id) {
			int retMoney = m_pAccs[i]->getBalance();
			retMoney -= money;

			if (m_pAccs[i]->getBalance() < 0) {
				cout << "잔액이 부족합니다" << endl << endl;
				retMoney = m_pAccs[i]->getBalance();
				retMoney += money;
				m_pAccs[i]->changeBalance(retMoney);
				return;
			}

			m_pAccs[i]->changeBalance(retMoney);
			cout << "잔액 : " << m_pAccs[i]->getBalance() << endl << endl;
			return;
		}
	}
	cout << "해당 계좌가 존재하지 않습니다" << endl << endl;
	return;
}

void BankSystem::InquiryAcc() const{
	int id;

	cout << "[계좌조회]" << endl;
	cout << "계좌번호 : "; cin >> id;
	cout << endl << endl;

	for (int i = 0; i < m_NumOfAcc; i++) {
		if (m_pAccs[i]->getID() == id) {
			cout << "--------------------" << endl;
			cout << "계좌번호 : " << id << endl;
			cout << "이름 : " << m_pAccs[i]->getName() << endl;
			cout << "잔고 : " << m_pAccs[i]->getBalance() << endl << endl;

			return;
		}
	}

	cout << "해당 계좌가 존재하지 않습니다" << endl << endl;

}

int main(void) {
	int option;
	BankSystem shinhan;

	while (true)
	{
		shinhan.AnnounceSys();
		cout << "선택 : ";
		cin >> option;
		cout << endl;

		switch (option)
		{
		case DEPOSIT:
			shinhan.DepositMoney();
			break;

		case WITHDRAW:
			shinhan.WithdrawMoney();
			break;

		case CREATE:
			shinhan.CreateAccount();
			break;

		case INQUIRY:
			shinhan.InquiryAcc();
			break;

		case EXIT:
			return 0;

		default:
			cout << "Illegal selection" << endl;

		}
	}
	return 0;
}

• 나는 교재의 답안과 달리 Account와 BankSystem 두개의 클래스를 만들었기 때문에, const를 BankSystem의 함수에도 선언해 주었다. 그리고 Account 클래스에는 액세스 함수가 거의 전부이므로 const 선언의 필요가 있었다.