[C++ 프로젝트] 은행계좌 관리 프로그램 Part. 02

1. 클래스의 대상과 클래스 구성 방법
2. Account 구조체의 cha형 배열 멤버를 Account 클래스에서 동적 할당으로 구현
   -> 멤버변수로 문자열 포인터를 이용
3. 객체 배열을 이용하지 않고, 객체 포인터 배열을 이용해 구현

---

#include <iostream>
#include <cstring>
#include <string>

using namespace std;
const int NAME_LEN = 20;

void ShowMenu(void);		//메뉴출력
void MakeAccount(void);		//계좌개설을 위한 함수
void DespositMoney(void);	//입금
void WithdrawMoney(void);	//출금
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_s(cusName, strlen(name) + 1, name);
	}

	int GetAccID() { return accID; }

	void Deposit(int money)
	{
		balance += money;
	}

	int Withdraw(int money) //출금액 반환, 부족 시 0 반환
	{
		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;

int main(void)
{
	int choice;
	
	while (1)
	{
		ShowMenu();
		cout << "선택 : ";
		cin >> choice;
		cout << endl;

		switch (choice)
		{
		case MAKE:
			MakeAccount();
			break;
		case DEPOSIT:
			DespositMoney();
			break;
		case WITHDRAW:
			WithdrawMoney();
			break;
		case INQUIRE:
			ShowAllAccInfo();
			break;
		case EXIT:
			for (int i = 0; i < accNum; i++)
			{
				delete accArr[i];
			}
			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;
}

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 DespositMoney(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 ID입니다." << 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;
	}
}