如何更改数组中的值？

Question

我尝试创建一个影院系统。您添加影院（给出尺寸--2d数组），并且首先它们是空的（在数组中标记为'_'）。此外，您可以预订座位，您可以显示所有影院并删除其中任何一个。我在预订时遇到了麻烦。 我给你我的代码：

class theatre

class theatre
{
    int id,seats,x,y;
    int arr[100];

public:
    void addTheatre();  
    void showdata() const;  
    int idTheatre() const;
    void reserveSeats(int n) const;
};

Add

void theatre::addTheatre()
{
    cout << "Please enter the id of the theatre:" << endl;
    cin >> id;

    cout << "Please enter  the number of the seats in the theatre:" << endl;
    cin >> seats;

    cout << "Please enter the dimensions:" << endl;
    cin >> x >> y;
}

// i use a function for write in the file
void write_theatre()
{
    theatre th;
    ofstream outFile;

    outFile.open("theatre.txt",ios::binary|ios::app);
    th.addTheatre();
    outFile.write(reinterpret_cast<char *> (&th), sizeof(theatre));
    outFile.close();
    cout << "\n\nTheatre has been added succesfully ";

    cin.ignore();
    cin.get();
}

Display

void theatre::showdata() const
{
    int k=x+1;
    char** t = new char*[k];

    for ( int i = 0 ; i < k ; i++ )
    t[i] = new char[y];

    for ( int i = 0 ; i < k ; i++ )
        cout << i << '\t';
    cout << '\n' ;

    for ( int i = 0 ; i < k ; i++ )
    { 
        for ( int j =0 ; j < y ; j++ )
        {
            t[0][j]=char('a' + j);
            t[i][j]='_';
        }
    }

    for ( int j = 0 ; j <y ; j++ )
    {
        for ( int i = 0 ; i < k ; i++ )
        {
            cout << t[i][j] << '\t';
        }
        cout << '\n';
    }

    for ( int i = 0 ; i < x ; i++ )
        delete[] t[i];
    delete[] t;
} 

//function to write in the file
void display_all_theatres()
{
    theatre th;
    ifstream inFile;

    inFile.open("theatre.txt",ios::binary);
    if(!inFile)
    {
        cout<<"File could not be open !! Press any Key...";
        cin.ignore();
        cin.get();
        return;
    }

    cout << "\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n";

    while(inFile.read(reinterpret_cast<char *> (&th), sizeof(theatre)))
    {
        th.showdata();
        cout << "\n\n====================================\n";
    }

    inFile.close();
    cin.ignore();
    cin.get();
}

Id

int  theatre::idTheatre() const
{
    return id;
}

预订

void theatre::reserveSeats(int n) const
{
    int k,m;
    char c;

    theatre th;
    bool found=false;

    fstream File;
    File.open("theatre.txt",ios::binary|ios::in|ios::out);
    if(!File)
    {
        cout<<"File could not be open !! Press any Key...";
        cin.ignore();
        cin.get();
        return;
    }

    while(!File.eof() && found==false)
    {
        File.read(reinterpret_cast<char *> (&th), sizeof(theatre));
        if(th.idTheatre()==n)
        {
            cout << "How many seats do you want to reserve?" << endl;
            cin >> k;

            for(int i=0;i<k;i++)
            {
                cout << "Enter the number of "<<i+1<<"seat:" << endl;
                cin >> m;
            }

            int pos=(-1)*static_cast<int>(sizeof(th));
            File.seekp(pos,ios::cur);
            File.write(reinterpret_cast<char *> (&th), sizeof(theatre));

            cout << "\n\n\t Record Updated";
            found = true;
        }
    }

    File.close();
    if(found==false)
        cout<<"Record Not Found ";
    cin.ignore();
    cin.get();
}

根据预订，我想向用户输入他想要的座位号（例如B5），而在数组中而不是'_'，它将显示为'X'。我不知道如何改变特定剧院的阵列。