C＆＃x2B;＆＃x2B; code :: blocks ios :: in Works，ios :: Out | ios :: app否

Question

我有一个非常简单的代码通过Code :: blocks：

#include <iostream>
#include <fstream>

using namespace std;

string firstName, lastName;
int phoneNumber;

int main()
{
    fstream file;

    file.open("card.txt", ios::in);

    if (file.good())
    {
        cout << "File is good (read)" << endl;
        file.close();
    }
    else
    {
        cout << "Cannot open file (read)." << endl;
    }

    file.open("card.txt", ios::out | ios::app);

    if (file.good())
    {
        cout << "Enter your First Name: \n";
        cin >> firstName;
        cout << "Enter your Last Name: \n";
        cin >> lastName;
        cout << "Enter your Phone Number: \n";
        cin >> phoneNumber;

        file << firstName << endl;
        file << lastName << endl;
        file << phoneNumber << endl;

        file.close();
    }
    else
    {
        cout << "Cannot open file (write)." << endl;
    }

    return 0;
}

card.txt文件位于项目主文件夹中。从第一个开始，如果我得到“文件很好（读）”。从第二个开始，我得到“无法打开文件（写）”。

真的不知道为什么。也许代码::阻止属性设置不正确。对我来说，他们似乎还可以，自安装以来就没有改变。