void account_query::edit_rec()
{
    int n;
    fstream iofile;
    iofile.open("record.bank", ios::in|ios::binary);
    if(!iofile)
    {
        cout<<"\nError in opening! File Not Found!!"<<endl;
        return;
    }
    iofile.seekg(0, ios::end); // 1번 부분
    int count = iofile.tellg()/sizeof(*this);
    cout<<"\n There are "<<count<<" record in the file";
    cout<<"\n Enter Record Number to edit: ";
    cin>>n;
    iofile.seekg((n-1)*sizeof(*this));
    iofile.read(reinterpret_cast<char*>(this), sizeof(*this));
    cout<<"Record "<<n<<" has following data"<<endl;
    show_data();
    iofile.close();
    iofile.open("record.bank", ios::out|ios::in|ios::binary); // 2번 부분
    iofile.seekp((n-1)*sizeof(*this));
    cout<<"\nEnter data to Modify "<<endl;
    read_data();
    iofile.write(reinterpret_cast<char*>(this), sizeof(*this));
}