我们如何编写一个 c++ 程序来使用类来控制银行账户？

Question

我必须编写以下程序来控制银行帐户（作为作业）：

1. 使用命名类 Account 创建程序原型。每个类都有一个所有者名称和余额。

2. 应将以下银行业务添加到程序中： 所有者可以从其帐户中提取金额。添加帐户信息。所有者可以在他的帐户中存入一笔金额。所有者可以将金额转移到另一个帐户。所有者可以查看账户余额。

3. 为了测试程序，必须执行以下程序： 创建两个对象帐户 A1 和 A2；在 A1 中存入 500。在 A2 中存入 200。从 A1 中取出 100。显示 A1 的余额。从 A2 中取出 50。显示 A2 的余额。将 150 从 A1 转移到 A2。

这就是我所做的。我还没有添加ant类，很不完整。

#include <iostream>
using namespace std;
int main () {
    int password = 30718042;
    int OperationNumber, amount, CurrentBalance, AccountNumber, selection;
    cout <<"Welcome FATIH HANCER, please enter your password: ";
    cin >> password;

    while (password != 30718042) {
        cout <<"Please enter your password again. ";
        cin >> password;
    }

    while (password == 30718042) {
        cout <<"Please enter your operation number: "<<endl<<"1. Withdraw"<<endl<<"2. Deposit"<<endl<<"3. Transfer"<<endl<<"4. Check the balance"<<endl;
        cin >> OperationNumber;
        if (OperationNumber == 1) {
            cout <<"Please enter the amount you would like to withdraw. "<<endl;
            cin >> amount;
            int CurrentBalance -= amount;
            cout <<"Deposit action is completed. Your new balance is "<<CurrentBalance<<endl;
        }
        cout <<"\nIf there is another operation to do, please press 1. Otherwise, you will be redirected to the main menu. "<<endl;
        cin >> selection;
        if (selection != 1) {
            cout <<"Thank you for preferring us. "<<endl;
            break;
        } 
    }
    if (OperationNumber == 2) {
        cout <<"Please enter the amount you would like to deposit."<<endl;
        cin >> amount;
        int CurrentBalance += amount;
        cout <<"Deposit action is completed. Your new balance is "<<CurrentBalance<<endl;
    }
    if (OperationNumber == 3) {
        cout <<"Please enter the account number of whom you would like to transfer."<<endl;
        cin >> AccountNumber;
        while (AccountNumber == 30718059) {
            cout <<"Please enter the amount of money you would like to transfer to ABDULRAHMAN SUBH's account"<<endl;
            cin >> amount;
            int CurrentBalance -= amount;
            cout <<"Deposit action is completed. Your new balance is "<<CurrentBalance<<endl;
            break;
        };
    }

    while (AccountNumber != 30718059) {
        cout <<"The user couldn't be found. ";
        break;
    }

    if (OperationNumber == 4) {
        cout <<"Your balance is "<<CurrentBalance<<endl;
    }
    return 0;
}

如何修复[Error] expected initializer before '-=' token？ 此外，我希望余额可以通过提款、存款和转帐进行更改。

Answer 1

int CurrentBalance -= amount;

您需要声明和初始化 CurrentBalance 变量，例如

int CurrentBalance = 100;
CurrentBalance -= amount;

-= - 这个操作意味着CurrentBalance = CurrentBalance - amount;