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  1.  
  2. #include <iostream>
  3. #include <string>
  4. #include <limits>
  5. using namespace std;
  6.  
  7. bool readInt(const string& msg, int& x) {
  8.     while (true) {
  9.         cout << msg;
  10.         if (cin >> x) return true;
  11.         if (cin.eof()) return false;
  12.         cin.clear();
  13.         cin.ignore(numeric_limits<streamsize>::max(), '\n');
  14.         cout << "Phai nhap so nguyen!\n";
  15.     }
  16. }
  17. bool readDouble(const string& msg, double& x) {
  18.     while (true) {
  19.         cout << msg;
  20.         if (cin >> x) return true;
  21.         if (cin.eof()) return false;
  22.         cin.clear();
  23.         cin.ignore(numeric_limits<streamsize>::max(), '\n');
  24.         cout << "Phai nhap so!\n";
  25.     }
  26. }
  27. string readLine(const string& msg) {
  28.     cout << msg;
  29.     string s;
  30.     getline(cin >> ws, s);
  31.     return s;
  32. }
  33.  
  34. // Theo de struct Account co 4 truong; them mang locked[] de luu trang thai khoa.
  35. struct Account { int id; string username, password, role; };
  36. int findIndex(Account* ds,int n,int id){
  37.     for(int i=0;i<n;++i)if(ds[i].id==id)return i;
  38.     return -1;
  39. }
  40. void input(Account* ds,bool* locked,int n){
  41.     for(int i=0;i<n;++i){
  42.         cout<<"\nTai khoan "<<i+1<<":\n";
  43.         while(true){if(!readInt("ID: ",ds[i].id))return;
  44.             if(findIndex(ds,i,ds[i].id)==-1)break;
  45.             cout<<"ID trung!\n";}
  46.         while(true){
  47.             ds[i].username=readLine("Username: ");
  48.             bool duplicate=false;
  49.             for(int j=0;j<i;++j)if(ds[j].username==ds[i].username)duplicate=true;
  50.             if(!duplicate&&!ds[i].username.empty())break;
  51.             cout<<"Username trung hoac rong!\n";
  52.         }
  53.         ds[i].password=readLine("Password (demo): ");
  54.         while(true){ds[i].role=readLine("Role (admin/user): ");
  55.             if(ds[i].role=="admin"||ds[i].role=="user")break;
  56.             cout<<"Role khong hop le!\n";}
  57.         locked[i]=false;
  58.     }
  59. }
  60. int login(Account* ds,bool* locked,int n){
  61.     string username=readLine("Username: ");
  62.     string password=readLine("Password: ");
  63.     for(int i=0;i<n;++i){
  64.         if(ds[i].username==username&&ds[i].password==password){
  65.             if(locked[i]){cout<<"Tai khoan da bi khoa!\n";return -1;}
  66.             return i;
  67.         }
  68.     }
  69.     cout<<"Dang nhap that bai!\n";return -1;
  70. }
  71. void showAll(Account* ds,bool* locked,int n,int currentIndex){
  72.     if(ds[currentIndex].role!="admin"){
  73.         cout<<"Chi admin xem danh sach tai khoan!\n";return;
  74.     }
  75.     for(int i=0;i<n;++i){
  76.         cout<<ds[i].id<<" | "<<ds[i].username<<" | "<<ds[i].role
  77.             <<" | "<<(locked[i]?"LOCKED":"ACTIVE")<<'\n';
  78.         // Khong hien thi password.
  79.     }
  80. }
  81. void viewAccount(Account* ds,int n,int currentIndex){
  82.     int id;if(!readInt("ID can xem: ",id))return;
  83.     int idx=findIndex(ds,n,id);
  84.     if(idx==-1){cout<<"Khong tim thay!\n";return;}
  85.     if(ds[currentIndex].role!="admin"&&idx!=currentIndex){
  86.         cout<<"Khong duoc xem tai khoan nguoi khac!\n";return;
  87.     }
  88.     cout<<"ID: "<<ds[idx].id<<" | Username: "<<ds[idx].username
  89.         <<" | Role: "<<ds[idx].role<<'\n';
  90. }
  91. void changePassword(Account* ds,int currentIndex){
  92.     // User va admin chi duoc doi mat khau cua CHINH MINH.
  93.     string old=readLine("Mat khau hien tai: ");
  94.     if(old!=ds[currentIndex].password){cout<<"Mat khau cu sai!\n";return;}
  95.     string fresh=readLine("Mat khau moi: ");
  96.     if(fresh.empty()){cout<<"Khong duoc rong!\n";return;}
  97.     ds[currentIndex].password=fresh;
  98.     cout<<"Da doi mat khau!\n";
  99. }
  100. void lockAccount(Account* ds,bool* locked,int n,int currentIndex){
  101.     if(ds[currentIndex].role!="admin"){
  102.         cout<<"Chi admin duoc khoa tai khoan!\n";return;
  103.     }
  104.     int id;if(!readInt("ID can khoa: ",id))return;
  105.     int idx=findIndex(ds,n,id);
  106.     if(idx==-1){cout<<"Khong tim thay!\n";return;}
  107.     if(idx==currentIndex){cout<<"Khong khoa tai khoan dang su dung!\n";return;}
  108.     locked[idx]=true;cout<<"Da khoa tai khoan!\n";
  109. }
  110. int main(){
  111.     int n;if(!readInt("Nhap n (1..1000): ",n)||n<1||n>1000)return 0;
  112.     Account* ds=new Account[n];bool* locked=new bool[n];
  113.     input(ds,locked,n);
  114.     int mainChoice=-1;
  115.     do{
  116.         if(!readInt("\n1.Dang nhap 0.Thoat: ",mainChoice))break;
  117.         if(mainChoice==1){
  118.             int currentIndex=login(ds,locked,n);
  119.             if(currentIndex<0)continue;
  120.             int choice=-1;
  121.             do{
  122.                 if(!readInt("\n1.Danh sach 2.Xem tai khoan 3.Doi password 4.Khoa tai khoan 0.Dang xuat: ",choice))break;
  123.                 switch(choice){
  124.                     case 1:showAll(ds,locked,n,currentIndex);break;
  125.                     case 2:viewAccount(ds,n,currentIndex);break;
  126.                     case 3:changePassword(ds,currentIndex);break;
  127.                     case 4:lockAccount(ds,locked,n,currentIndex);break;
  128.                     case 0:break;
  129.                     default:cout<<"Lua chon sai!\n";
  130.                 }
  131.             }while(choice!=0&&!cin.eof());
  132.         }else if(mainChoice!=0)cout<<"Lua chon sai!\n";
  133.     }while(mainChoice!=0&&!cin.eof());
  134.     delete[] ds;ds=nullptr;
  135.     delete[] locked;locked=nullptr;
  136.     return 0;
  137. }
  138.  
  139.  
Success #stdin #stdout 0s 5316KB
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Nhap n (1..1000):
https://ideone.com/3aVN09
quan ly tai khoan
language:
C++14 (clang 8.0)
created:
11 hours ago
visibility:
public

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