c++ - 将对象数组、对象的数量和所需的术语传递给函数

Question

在完成与 BankAccounts 相关的练习时，我在编程书籍中遇到了一些问题。问题是:

创建一个 main() 函数，声明一个包含 10 个 BankAccount 对象的数组。后 输入第一个 BankAccount 对象时，询问用户是否要继续。提示用户输入 BankAccount 值，直到用户想要退出或输入 10 个 BankAccount 对象，以先到者为准。对于输入的每个 BankAccount，显示 BankAccount 详细信息。然后提示用户输入一个值介于 1 和 40 之间的术语。继续提示用户，直到输入有效值。 然后将 BankAccount 对象数组、数组中有效对象的计数以及所需期限传递给一个函数，该函数计算并显示每个 BankAccounts 的值标准利率。

我必须使用 3 个公共(public)函数来完成此任务。当我尝试 computeInterest() 时，我才开始遇到问题。如果我尝试将项和计数传递给函数并在 2 个 for 循环中设置它，我将只会收到单个对象的数字和余额。我想我要问的是:如何让程序调用 computeInterest 并运行每个 BankAccount 对象？

目前我的代码已经设置好，可以很好地编译和运行，但是，问题要求将术语和计数发送到函数，而我只发送​​术语。

我不确定我是否将对象数组发送给函数？这可能是造成麻烦的原因。这已经困扰我好几天了:(。非常感谢任何帮助/指点!

#include<iostream>
#include<string>
using namespace std;

// Declaration Section

class BankAccount
{
private:
    int accNum;
    double accBal;
    const static double intRate;

public:
    void enterAccountData(int, double);
    void computeInterest(int);
    void displayAccount();
};

// Implementation Section

const double BankAccount::intRate = 0.03;

void BankAccount::enterAccountData(int num, double bal)
{
    const int MIN_ACC = 1000, MAX_ACC = 9999, MIN_BAL = 0,
    MAX_BAL = 100000;

    cout << "Enter account number: ";
    cin >> num;

    while (num < MIN_ACC || num > MAX_ACC)
    {
        cout << "ERROR: Account number must be between " << MIN_ACC <<
        " - " << MAX_ACC << ".\n" << "Enter account number: ";
        cin >> num;
    }

    cout << "Enter account balance: $";
    cin >> bal;

    while (bal < MIN_BAL || bal > MAX_BAL)
    {
        cout << "ERROR: Account balance must be positive and less than $" <<
        MAX_BAL << ".\n" << "Enter account balance: $";
        cin >> bal;
    }

    accNum = num;
    accBal = bal;
}

void BankAccount::computeInterest(int YR)
{
    int x;
    double interest;

    for (x = 0; x < YR; ++x)
    {
        interest = accBal * intRate;
        accBal = accBal + interest;

        cout << "Account# " << accNum <<
            ", Balance: $" << accBal << ", Interest: " <<
            intRate << endl;
    }
    cout << endl;
}

void BankAccount::displayAccount()
{
    cout<<"Account: " << accNum <<", Balance: $" << accBal <<
    ", Interest: " << intRate << endl << endl;
}

int main()
{
    const int END = -999, MAX_ACCOUNTS = 10, CONTINUE = 1, MIN_TERM = 1,
    MAX_TERM = 40;
    int i, x, count = 0, num = 0, term = 0;
    double bal = 0;

    BankAccount accounts[MAX_ACCOUNTS];

    do
    {
        count++;
        accounts[count - 1].enterAccountData(num, bal);
        accounts[count - 1].displayAccount();
        cout << "Enter " << CONTINUE << " to proceed, or " << END << " to stop: ";
        cin >> i;

        if (i == END || count == MAX_ACCOUNTS)
        {
            cout << "Enter the term of the accounts (" << MIN_TERM <<
                "-" << MAX_TERM << "): ";
            cin >> term;

            while (term < MIN_TERM || term > MAX_TERM)
            {
                cout << "ERROR: Term must be between " << MIN_TERM <<
                    " - " << MAX_TERM << " inclusive.\n" <<
                    "Enter term of the accounts (" << MIN_TERM <<
                    "-" << MAX_TERM << "): ";
                cin >> term;
            }

            for (x = 0; x < count; ++x)
                accounts[x].computeInterest(term);
        }
    } while (i != END && count != MAX_ACCOUNTS);
}

Answer 1

你已经在做 for (x = 0; x < count; ++x) accounts[x].computeInterest(term);

如果确实有必要，您可以将那段特定的代码移到一个单独的函数中，该函数接受 3 个参数:数组 accounts , count和 term .

设置 BankAccount 类的方式是每个对象计算自己的利息。 由于您有多个这样的对象，您可以要求每个对象计算自己的兴趣。

希望这对您有所帮助!如果还有其他问题，请告诉我 :)