4.2-BankAccount-Lab

程式碼:
main.cpp

#include <iostream>
#include "BankAccount.h"

using namespace std;

int main() {
 BankAccount bankAccount1(200), bankAccount2, bankAccount3(-100);
 cout << BankAccount::getAllMoneyInBank() << endl;
 bankAccount1.withdraw(100);
 cout << bankAccount1.getBalance() << endl;
 cout << BankAccount::getAllMoneyInBank() << endl;
 bankAccount2.save(50);
 cout << bankAccount2.getBalance() << endl;
 cout << BankAccount::getAllMoneyInBank() << endl;
 return 0;
}

BankAccount.h

#pragma once
class BankAccount {
private:
 int balance;
 static int total;
public:
 BankAccount()
 {
  balance = 0;
 }
 BankAccount(int input)
 {
  balance = input;
  total += input;
 }
 void withdraw(int output);
 void save(int input);
 int getBalance() { return balance; }
 static int getAllMoneyInBank() { return total; }
};

BankAccount.cpp

#include"BankAccount.h"

int BankAccount::total = 0;

void BankAccount::withdraw(int output)
{
 balance -= output;
 total -= output;
}
void BankAccount::save(int input)
{
 balance += input;
 total += input;
}