원본 코드

```c++ // 출처 https://omkarnathsingh.wordpress.com/2016/02/09/c-program-for-book-shop/

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- 4-2) void account_query::read_rec() 본문

void account_query::read_rec()
{
    ifstream infile;
    infile.open("record.bank", ios::binary);
    if (!infile)
    {
        cout << "Error in Opening! File Not Found!!" << endl;
        return;
    }
    cout << "\n****Data from file****" << endl;
    while (!infile.eof())
    {
        if (infile.read(reinterpret_cast<char*>(this), sizeof(*this)))
        {
            show_data();
        }
    }
    infile.close();
}

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```c++ #include #include #include using std::cout; using std::cin; using std::endl; using std::fstream; using std::ofstream; using std::ifstream; using std::ios; class account_query { private: char account_number[20]; char firstName[10]; char lastName[10]; float total_Balance; public: void read_data(); void show_data(); void write_rec(); void read_rec(); void search_rec(); void edit_rec(); void delete_rec(); }; void account_query::read_data() { cout << "\nEnter Account Number: "; cin >> account_number; cout << "Enter First Name: "; cin >> firstName; cout << "Enter Last Name: "; cin >> lastName; cout << "Enter Balance: "; cin >> total_Balance; cout << endl; } void account_query::show_data() { cout << "Account Number: " << account_number << endl; cout << "First Name: " << firstName << endl; cout << "Last Name: " << lastName << endl; cout << "Current Balance: Rs. " << total_Balance << endl; cout << "-------------------------------" << endl; } void account_query::write_rec() { ofstream outfile; outfile.open("record.bank", ios::binary | ofstream::app); read_data(); outfile.write(reinterpret_cast<char*>(this), sizeof(*this)); outfile.close(); } void account_query::read_rec() { ifstream infile; infile.open("record.bank", ios::binary); if (!infile) { cout << "Error in Opening! File Not Found!!" << endl; return; } cout << "\n****Data from file****" << endl; while (!infile.eof()) { if (infile.read(reinterpret_cast<char*>(this), sizeof(*this))) { show_data(); } } infile.close(); } void account_query::search_rec() { int n; ifstream infile; infile.open("record.bank", ios::binary); if (!infile) { cout << "\nError in opening! File Not Found!!" << endl; return; } infile.seekg(0, ios::end); int count = infile.tellg() / sizeof(*this); cout << "\n There are " << count << " record in the file"; cout << "\n Enter Record Number to Search: "; cin >> n; infile.seekg((n - 1) * sizeof(*this)); infile.read(reinterpret_cast<char*>(this), sizeof(*this)); show_data(); } 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); 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); iofile.seekp((n - 1) * sizeof(*this)); cout << "\nEnter data to Modify " << endl; read_data(); iofile.write(reinterpret_cast<char*>(this), sizeof(*this)); } void account_query::delete_rec() { int n; ifstream infile; infile.open("record.bank", ios::binary); if (!infile) { cout << "\nError in opening! File Not Found!!" << endl; return; } infile.seekg(0, ios::end); int count = infile.tellg() / sizeof(*this); cout << "\n There are " << count << " record in the file"; cout << "\n Enter Record Number to Delete: "; cin >> n; fstream tmpfile; tmpfile.open("tmpfile.bank", ios::out | ios::binary); infile.seekg(0); for (int i = 0; i < count; i++) { infile.read(reinterpret_cast<char*>(this), sizeof(*this)); if (i == (n - 1)) continue; tmpfile.write(reinterpret_cast<char*>(this), sizeof(*this)); } infile.close(); tmpfile.close(); remove("record.bank"); rename("tmpfile.bank", "record.bank"); } int main() { account_query A; int choice; cout << "***Acount Information System***" << endl; while (true) { cout << "Select one option below "; cout << "\n\t1-->Add record to file"; cout << "\n\t2-->Show record from file"; cout << "\n\t3-->Search Record from file"; cout << "\n\t4-->Update Record"; cout << "\n\t5-->Delete Record"; cout << "\n\t6-->Quit"; cout << "\nEnter your choice: "; cin >> choice; switch (choice) { case 1: A.write_rec(); break; case 2: A.read_rec(); break; case 3: A.search_rec(); break; case 4: A.edit_rec(); break; case 5: A.delete_rec(); break; case 6: exit(0); break; default: cout << "\nEnter corret choice"; exit(0); } } system("pause"); return 0; }

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