c++ - 使用类 - 分配大小无效

Question

我有作业，但没用。我能猜到为什么它不起作用是 vs2013 的自动断点，它在输出框中显示它。

HEAP[hw2_ccc.exe]:分配大小无效 - 10(超过 fffdefff)

hw2_ccc.exe 中 0x000007FEFD9D940D 处的第一次机会异常:Microsoft C++ 异常:内存位置 0x000000000012F350 处的 std::bad_alloc。

HEAP[hw2_ccc.exe]:分配大小无效 - 1(超过 fffdefff)

hw2_ccc.exe 中 0x000007FEFD9D940D 处的第一次机会异常:Microsoft C++ 异常:内存位置 0x000000000012CE40 处的 std::bad_alloc。

hw2_ccc.exe 中 0x000007FEFD9D940D 处的第一次机会异常:Microsoft C++ 异常:[重新抛出] 在内存位置 0x0000000000000000。

hw2_ccc.exe 中 0x000007FEFD9D940D 处的第一次机会异常:Microsoft C++ 异常:内存位置 0x000000000012CE40 处的 std::bad_alloc。

hw2_ccc.exe 中发生缓冲区溢出，损坏了程序的内部状态。

这是我的代码:

银行帐户.h

#ifndef H_bankAccount
#define H_bankAccount

#include <string>
#include <iostream>

using namespace std;

class bankAccount
{
public:
    void setAccountName(string holderName);
    void setAccountNumber(int accountNumber);
    void setInterestRate(double interestRate);
    void setAccountType(string accountType);
    void depositBalance(double deposit);
    void withdrawBalance(double withdraw);
    void printAccountInformation();
    void newAccount(string holderName, int accountNumber, string accountType, double interestRate);
    string getAccountName();
    bankAccount();
    ~bankAccount();

private:
    string holderName;
    int accountNumber;
    string accountType;
    double balance;
    double interestRate;

};
#endif

银行账户.cpp

#include "bankAccount.h"

using namespace std;

bankAccount::bankAccount()
{

}

bankAccount::~bankAccount()
{

}

void bankAccount::newAccount(string holderName, int accountNumber, string accountType, double interestRate)
{
    setAccountName(holderName);
    setAccountNumber(accountNumber);
    setAccountType(accountType);
    setInterestRate(interestRate);
}

void bankAccount::setAccountName(string holderName)
{
    bankAccount::holderName = holderName;
}

void bankAccount::setAccountNumber(int accountNumber)
{
    bankAccount::accountNumber = accountNumber;
}

void bankAccount::setAccountType(string accountType)
{
    bankAccount::accountType = accountType;
}

void bankAccount::setInterestRate(double interestRate)
{
    bankAccount::interestRate = interestRate;
}

void bankAccount::depositBalance(double deposit)
{
    bankAccount::balance += deposit;
}

void bankAccount::withdrawBalance(double withdraw)
{
    bankAccount::balance -= withdraw;
}

void bankAccount::printAccountInformation()
{
    cout << "Account Name: " << bankAccount::holderName << endl;
    cout << "Account Type: " << bankAccount::accountType << endl;
    cout << "Account Number: " << bankAccount::accountNumber << endl;
    cout << "Account Interest Rate: " << bankAccount::interestRate << endl;
    cout << "Account Balance :" << bankAccount::balance << endl;
}

string bankAccount::getAccountName()
{
    return holderName;
}

主要.cpp

#include "bankAccount.h"

using namespace std;

int randAccountNum();
string randAccountType();
int interestRate(string accountType);
bool printAccount(bankAccount accounts[10]);

int main()
{
    bankAccount account[10];
    string accountNames[10] = { "Bob", "Jack", "Billy", "James", "Kathy", "John", "Jenny", "Penny", "Sue", "Louis" };
    string accountType;
    int accountNumber;
    bool prAcc = true;

    for (int i = 0; i < sizeof(account); i++)
    {
        accountType = randAccountType();
        accountNumber = randAccountNum();
        account[i].newAccount(accountNames[i], accountNumber, accountType, interestRate(accountType));
    }

    while (prAcc)
    {
        prAcc = printAccount(account);
    }

    system("pause");

    return 0;
}

int randAccountNum()
{
    int num = rand() % 1000 + 1;
    return num;
}

string randAccountType()
{
    string str;
    int num = rand() % 2 + 1;
    if (num = 1)
    {
        str = "Savings";
    }
    else {
        str = "Checking";
    }

    return str;
}

int interestRate(string accountType)
{
    int ir;

    if (accountType == "Savings")
    {
        ir = 2;
    }
    else {
        ir = 4;
    }

    return ir;
}    

bool printAccount(bankAccount accounts[10])
{
    string cont;
    bool contL = true;
    string accountName;

    cout << "Enter account name: ";
    cin >> accountName;
    cout << endl;

    for (int i = 0; i < sizeof(accounts); i++)
    {
        if (accounts[i].getAccountName() == accountName)
        {
            accounts[i].printAccountInformation();
        }
    }




    while (contL)
    {
        cout << "Enter another name? (Yes/No): ";
        cin >> cont;
        if (cont == "Yes")
            return true;
        else if (cont == "No")
            return false;
        else
            cout << "Invalid. Please enter Yes or No" << endl;
    }


}

Answer 1

更改此声明

for (int i = 0; i < sizeof(account); i++)

到

for (int i = 0; i < sizeof(account) / sizeof(*account); i++)

功能也有错误

bool printAccount(bankAccount 账户[10]);

在这个声明中

for (int i = 0; i < sizeof(accounts); i++)

sizeof(accounts) 等于 sizeof( bankAccount * )

您必须为传递给函数的数组大小声明第二个参数。

考虑到您可以使用 std::array 类型的对象而不是数组。在这种情况下，数组的大小就不会有这样的问题。