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  1.  
  2. #include <iostream>
  3. #include <string>
  4. #include <limits>
  5. using namespace std;
  6.  
  7. struct Book {
  8.     int id;
  9.     string title;
  10.     string author;
  11.     bool borrowed;
  12. };
  13.  
  14. // Ham nhap so nguyen
  15. bool readInt(const string& prompt, int& x) {
  16.     cout << prompt;
  17.  
  18.     if (cin >> x)
  19.         return true;
  20.  
  21.     if (cin.eof())
  22.         return false;
  23.  
  24.     cin.clear();
  25.     cin.ignore(numeric_limits<streamsize>::max(), '\n');
  26.  
  27.     cout << "Vui long nhap so nguyen!\n";
  28.     return false;
  29. }
  30.  
  31. // Tim sach theo ID
  32. Book* findBook(Book* ds, int n, int id) {
  33.     for (int i = 0; i < n; i++) {
  34.         if (ds[i].id == id) {
  35.             return &ds[i];
  36.         }
  37.     }
  38.  
  39.     return nullptr;
  40. }
  41.  
  42. // Nhap danh sach
  43. void inputBooks(Book* ds, int n) {
  44.     for (int i = 0; i < n; i++) {
  45.         cout << "\nSach thu " << i + 1 << ":\n";
  46.  
  47.         while (true) {
  48.             int id;
  49.  
  50.             if (!readInt("ID: ", id))
  51.                 continue;
  52.  
  53.             if (findBook(ds, i, id) != nullptr) {
  54.                 cout << "ID da ton tai!\n";
  55.                 continue;
  56.             }
  57.  
  58.             ds[i].id = id;
  59.             break;
  60.         }
  61.  
  62.         cout << "Tieu de: ";
  63.         getline(cin >> ws, ds[i].title);
  64.  
  65.         cout << "Tac gia: ";
  66.         getline(cin >> ws, ds[i].author);
  67.  
  68.         ds[i].borrowed = false;
  69.     }
  70. }
  71.  
  72. // Hien thi mot cuon sach
  73. void printBook(const Book& b) {
  74.     cout << "ID: " << b.id
  75.          << " | Tieu de: " << b.title
  76.          << " | Tac gia: " << b.author
  77.          << " | Trang thai: "
  78.          << (b.borrowed ? "Da muon" : "Chua muon")
  79.          << '\n';
  80. }
  81.  
  82. // Hien thi danh sach
  83. void showBooks(Book* ds, int n) {
  84.     if (n == 0) {
  85.         cout << "Danh sach trong!\n";
  86.         return;
  87.     }
  88.  
  89.     for (int i = 0; i < n; i++) {
  90.         printBook(ds[i]);
  91.     }
  92. }
  93.  
  94. // Tim va hien thi sach
  95. void searchBook(Book* ds, int n) {
  96.     int id;
  97.  
  98.     if (!readInt("Nhap ID can tim: ", id))
  99.         return;
  100.  
  101.     Book* p = findBook(ds, n, id);
  102.  
  103.     if (p == nullptr) {
  104.         cout << "Khong tim thay sach!\n";
  105.         return;
  106.     }
  107.  
  108.     printBook(*p);
  109. }
  110.  
  111. // Muon sach
  112. void borrowBook(Book* ds, int n) {
  113.     int id;
  114.  
  115.     if (!readInt("Nhap ID muon muon: ", id))
  116.         return;
  117.  
  118.     Book* p = findBook(ds, n, id);
  119.  
  120.     if (p == nullptr) {
  121.         cout << "Khong tim thay sach!\n";
  122.         return;
  123.     }
  124.  
  125.     if (p->borrowed) {
  126.         cout << "Sach da duoc muon!\n";
  127.         return;
  128.     }
  129.  
  130.     p->borrowed = true;
  131.     cout << "Muon sach thanh cong!\n";
  132. }
  133.  
  134. // Tra sach
  135. void returnBook(Book* ds, int n) {
  136.     int id;
  137.  
  138.     if (!readInt("Nhap ID muon tra: ", id))
  139.         return;
  140.  
  141.     Book* p = findBook(ds, n, id);
  142.  
  143.     if (p == nullptr) {
  144.         cout << "Khong tim thay sach!\n";
  145.         return;
  146.     }
  147.  
  148.     if (!p->borrowed) {
  149.         cout << "Sach chua duoc muon!\n";
  150.         return;
  151.     }
  152.  
  153.     p->borrowed = false;
  154.     cout << "Tra sach thanh cong!\n";
  155. }
  156.  
  157. // Xoa sach - chi Librarian
  158. void deleteBook(Book*& ds, int& n, bool isLibrarian) {
  159.     if (!isLibrarian) {
  160.         cout << "Chi librarian duoc xoa sach!\n";
  161.         return;
  162.     }
  163.  
  164.     int id;
  165.  
  166.     if (!readInt("Nhap ID sach can xoa: ", id))
  167.         return;
  168.  
  169.     int index = -1;
  170.  
  171.     for (int i = 0; i < n; i++) {
  172.         if (ds[i].id == id) {
  173.             index = i;
  174.             break;
  175.         }
  176.     }
  177.  
  178.     if (index == -1) {
  179.         cout << "Khong tim thay sach!\n";
  180.         return;
  181.     }
  182.  
  183.     Book* temp = nullptr;
  184.  
  185.     if (n > 1) {
  186.         temp = new Book[n - 1];
  187.         int j = 0;
  188.  
  189.         for (int i = 0; i < n; i++) {
  190.             if (i == index)
  191.                 continue;
  192.  
  193.             temp[j++] = ds[i];
  194.         }
  195.     }
  196.  
  197.     delete[] ds;
  198.     ds = temp;
  199.     n--;
  200.  
  201.     cout << "Xoa sach thanh cong!\n";
  202. }
  203.  
  204. // Dang nhap mo phong
  205. bool login(bool& isLibrarian) {
  206.     int role;
  207.  
  208.     if (!readInt("1. Librarian  2. User\nChon: ", role))
  209.         return false;
  210.  
  211.     if (role == 2) {
  212.         isLibrarian = false;
  213.         return true;
  214.     }
  215.  
  216.     if (role == 1) {
  217.         string password;
  218.  
  219.         cout << "Nhap mat khau librarian: ";
  220.         cin >> password;
  221.  
  222.         if (password == "Lib123") {
  223.             isLibrarian = true;
  224.             return true;
  225.         }
  226.     }
  227.  
  228.     cout << "Dang nhap that bai!\n";
  229.     return false;
  230. }
  231.  
  232. int main() {
  233.     int n;
  234.  
  235.     if (!readInt("Nhap so sach (0..1000): ", n)
  236.         || n < 0 || n > 1000) {
  237.         cout << "So sach khong hop le!\n";
  238.         return 0;
  239.     }
  240.  
  241.     Book* ds = (n > 0) ? new Book[n] : nullptr;
  242.     inputBooks(ds, n);
  243.  
  244.     int mainChoice = -1;
  245.  
  246.     do {
  247.         if (!readInt(
  248.                 "\n=== MENU CHINH ===\n"
  249.                 "1. Dang nhap\n"
  250.                 "0. Thoat\n"
  251.                 "Chon: ", mainChoice)) {
  252.             mainChoice = -1;
  253.             if (cin.eof()) break;
  254.             continue;
  255.         }
  256.  
  257.         if (mainChoice == 1) {
  258.             bool isLibrarian = false;
  259.  
  260.             if (!login(isLibrarian)) {
  261.                 if (cin.eof()) break;
  262.                 continue;
  263.             }
  264.  
  265.             int choice = -1;
  266.  
  267.             do {
  268.                 if (!readInt(
  269.                         "\n=== MENU THU VIEN ===\n"
  270.                         "1. Hien thi\n"
  271.                         "2. Tim sach\n"
  272.                         "3. Muon sach\n"
  273.                         "4. Tra sach\n"
  274.                         "5. Xoa sach\n"
  275.                         "0. Dang xuat\n"
  276.                         "Chon: ", choice)) {
  277.                     choice = -1;
  278.                     if (cin.eof()) break;
  279.                     continue;
  280.                 }
  281.  
  282.                 switch (choice) {
  283.                     case 1:
  284.                         showBooks(ds, n);
  285.                         break;
  286.  
  287.                     case 2:
  288.                         searchBook(ds, n);
  289.                         break;
  290.  
  291.                     case 3:
  292.                         borrowBook(ds, n);
  293.                         break;
  294.  
  295.                     case 4:
  296.                         returnBook(ds, n);
  297.                         break;
  298.  
  299.                     case 5:
  300.                         deleteBook(ds, n, isLibrarian);
  301.                         break;
  302.  
  303.                     case 0:
  304.                         cout << "Da dang xuat!\n";
  305.                         break;
  306.  
  307.                     default:
  308.                         cout << "Lua chon khong hop le!\n";
  309.                 }
  310.  
  311.                 if (cin.eof()) break;
  312.  
  313.             } while (choice != 0);
  314.         }
  315.         else if (mainChoice != 0) {
  316.             cout << "Lua chon khong hop le!\n";
  317.         }
  318.  
  319.         if (cin.eof()) break;
  320.  
  321.     } while (mainChoice != 0);
  322.  
  323.     delete[] ds;
  324.     ds = nullptr;
  325.  
  326.     cout << "Da giai phong bo nho!\n";
  327.     return 0;
  328. }
  329.  
Success #stdin #stdout 0s 5308KB
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Nhap so sach (0..1000): So sach khong hop le!
https://ideone.com/eMrFFI
quan ly thu vien
language:
C++14 (clang 8.0)
created:
9 hours ago
visibility:
public

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