访问冲突c++ visual studio类

你的代码中有很多错误。

• Transaction缺少虚析构函数

• 你在填充数组时没有做任何边界检查

• 你的循环使用<=时，他们需要使用<代替

• 访问u[i]->t[]数组时主循环越界

• 你没有分配每个分配的User的ID字段，所以你不能通过他们的id找到用户。

• 您正在泄漏内存，因为您从未释放任何Transaction或User对象。

试试这样写:

#include <iostream>
using namespace std;
class Transaction
{
public:
    int USERID;
    int Amount;
    virtual Transaction() {}
    virtual void Report() = 0;
    virtual void Perform() = 0;
};
class Transfer : public Transaction
{
public:
    int transID;   // id of the user to tranfer with
    int transType; // type of transition; to or fro
    void Perform()
    {
        cout << "n" << "Transfer" << "nn";
        cout << "Enter the id of the user to tranfer with: ";
        cin >> transID;
        cout << "n" << "Transfer type:" << "n" << "1: To   2: Fro" << "n";
        cin >> transType;
        if (transType == 2)
        {
            int temp = transID;
            transID = USERID;
            USERID = temp;
        }
        cout << "n" << "Enter the amount you wish to withdraw: ";
        cin >> Amount;    
    }
    void Report()
    {
        cout << "nn" << "Transfer of " << Amount << "$ from user: #" << USERID << " to the user: #" << transID;
    }    
};
class Withdraw : public Transaction
{
public:    
    void Perform()
    {
        cout << "n" << "Withdraw" << "nn";
        cout << "Enter the amount you wish to withdraw: ";
        cin >> Amount;
    }
    void Report()
    {
        cout << "nn" << "Withdrawl of: " << Amount << "$";
    }    
};
class Deposit : public Transaction
{
public:    
    void Perform()
    {
        cout << "n" << "Deposit" << "n";
        cout << "Enter the amount you wish to deposit: ";
        cin >> Amount;
    }
    void Report()
    {
        cout << "nn" << "Deposit of: " << Amount << "$";
    }    
};
class User
{
public:
    int ID;
    int numTrans;
    Transaction* trans[100];
    int TYPE;
    User()
    {
        numTrans = 0;
    }
    ~User()
    {
        for (int i = 0; i < numTrans; ++i)
            delete trans[i];
    }
    Transaction* AddTransaction(int type)
    {
        if (numTrans == 100)
            return NULL;
        Transaction *t;
        switch (type)
        {
            case 1:
                t = new Withdraw;
                break;
            case 2:
                t = new Deposit;
                break;
            case 3:
                t = new Transfer;
                break;
            default:
                return NULL;
        }
        trans[numTrans] = t;
        numTrans++;
        return t;
    }
    Transaction* AddWithdraw()
    {
        return AddTransaction(1);
    }
    Transaction* AddDeposit()
    {
        return AddTransaction(2);
    }
    Transaction *AddTransfer()
    {
        return AddTransaction(3);
    }
};
void main()
{
    User* users[100];
    int numUsers = 0;
    int id;
    int type;
    for (int i = 0; i < 100; ++i)
    {
        users[i] = new User;
        users[i]->ID = i+1;
        ++numUsers;
    }
    while (true)
    {
        cout << "nPlease enter your ID: ";
        cin >> id;
        User *user = NULL;
        for (int i = 0; i < numUsers; ++i)
        {
            if (users[i]->ID == id)
            {
                user = users[i];
                break;
            }
        }
        if (!user)
        {
            cout << "Invalid id!" << "n";
            continue;
        }
        type = 0;
        do
        {
            cout << "n" << "Which transaction would you like to perform" << "n" << "1: Withdraw" << "n" << "2: Deposit" << "n" << "3: Transfer" << "n" << "4: Quit" << "n";
            cin >> type;
            if ((type >= 1) && (type <= 4))
                break;
            cout << "Invalid selection!" << "n";
        }
        while (true);
        if (type == 4)
            break;
        // Add the type of transaction to the transaction array
        Transaction *trans = user->AddTransaction(type);
        if (!trans)
        {
            cout << "Too many transactions for this id!" << "n";
            continue;
        }
        trans->USERID = id;
        trans->Perform();
        for (int b = 0; b < user->numTrans; ++b)
             user->trans[b]->Report();
    }
    for (int i = 0; i < numUsers; ++i)
        delete users[i];
    return 0;
}