c++ - 使用现有代码在数组中分配数据

Question

这个程序的目的是显示交易和余额。有点像这张照片。 目前我正在努力创建 RecordDeposit 和 RecordWithdraw 函数。我不知道如何将 Transaction 参数存储到 TransactionList 数组中。 Balance 和 Amount 来自不同的结构体，如何结合这两个变量并计算结果显示？

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

struct Customer
{
    string CustomerName;
    string UserID;
    string Pin;
};

struct Account
{
    Customer Holder;
    string AccountNo;
    double Balance;
    double TotalDeposit;
    double TotalWithdrawal;
    Transaction Trans;
    Transaction TransactionList[100];
    int TransactionCount;   
};

struct Transaction
{
    string TransactionDate;
    string TransactionDescription;
    double TransactionAmount;
};
Customer* CreateCustomer(const string& name, const string& id, const string& pin);

Transaction* CreateTransaction(const string& date, const string& description, const double& amount);

Account* CreateAccount(const Customer& holder, const string& number, const string& date, const double&balance, const double& deposit, const double& withdraw);

void RecordDeposit(Account* account, Transaction* transaction);

void RecordWithdraw(Account* account, Transaction* transaction);

void PrintReport(Account* account);


int main()
{
    Customer* Mary = CreateCustomer("Mary Jones", "235718", "5074");
    Customer* John = CreateCustomer("John Smith", "375864", "3251");

    Account* MaryAccount = CreateAccount(*Mary, "06-3121-10212357", "01/03/2014", 100, 100, 0);
    Account* JohnAccount = CreateAccount(*John, "06-3121-10213758", "10/03/2014", 0, 0, 0);

    RecordDeposit(MaryAccount, CreateTransaction("02/03/2014", "Deposit", 90) );
    RecordWithdraw(MaryAccount, CreateTransaction("04/03/2014", "ATM Withdrawal", 150) );
    RecordDeposit(MaryAccount, CreateTransaction("05/03/2014", "Deposit", 20) );
    RecordWithdraw(MaryAccount, CreateTransaction("05/03/2014", "Withdraw", 100) );
    RecordWithdraw(MaryAccount, CreateTransaction("05/03/2014", "Withdraw", 50) );
    RecordDeposit(JohnAccount, CreateTransaction("11/03/2014", "Deposit", 20) );
    RecordDeposit(JohnAccount, CreateTransaction("12/03/2014", "Deposit", 80) );
    RecordWithdraw(JohnAccount, CreateTransaction("12/03/2014", "Withdraw", 50) );

    return 0;
}

Customer* CreateCustomer(const string& name, const string& id, const string& pin)
{
    Customer *c = new Customer;

    c->CustomerName = name;
    c->UserID = id;
    c->Pin = pin;

    return c;
}

Transaction* CreateTransaction(const string& date, const string& description, const double& amount)
{
    Transaction *t = new Transaction;

    t->TransactionDate = date;
    t->TransactionDescription = description;
    t->TransactionAmount = amount;

    return t;
}

Account* CreateAccount(const Customer& holder, const string& number, const string& date, const double&balance, const double& deposit, const double& withdraw)
{
    Account *a = new Account;

    a->Holder = holder;
    a->AccountNo = number;
    a->Trans.TransactionDate = date;
    a->Balance = balance;
    a->TotalDeposit = deposit;
    a->TotalWithdrawal = withdraw;

    return a;
}

void RecordDeposit(Account* account, Transaction* transaction)
{
}

void RecordWithdraw(Account* account, Transaction* transaction)
{
}


void PrintReport(Account* account)
{
}

Answer 1

我复制并粘贴了你的代码，但它没有编译。您需要将 Transaction 结构移动到 Account 结构之前，因为它使用的是 transaction 结构中的内容。

现在回答你的问题，如果我可以帮助它存储交易，我不会使用数组，我会使用 Vector。原因是对于数组，您必须确保其中有足够的空间来输入新事务，然后导航到您拥有的下一个空闲槽。这是相当多的代码。

但是使用 vector 你可以做这样的事情:

struct Transaction
{
    // change this from an array to a vector.
    std::vector<Transaction> transactionList;
};

void RecordDeposit(Account* account, Transaction* transaction)
{
    account->transactionList.push_back(transaction);
}

对于 vector ，您调用 push_back 它将把它放在下一个空闲空间中。无需不断遍历数组并检查下一个可用空间。 Vectors 也可以随着数据的增长而增长。

希望这对您有所帮助。