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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. struct Product { int id; string name; double price; int quantity; };
  35. Product* findProduct(Product* products,int n,int id) {
  36.     for(int i=0;i<n;++i) if(products[i].id==id) return &products[i];
  37.     return nullptr;
  38. }
  39. void input(Product* ds,int n) {
  40.     for(int i=0;i<n;++i) {
  41.         cout<<"\nSan pham "<<i+1<<":\n";
  42.         while(true) {
  43.             if(!readInt("ID: ",ds[i].id)) return;
  44.             if(findProduct(ds,i,ds[i].id)==nullptr) break;
  45.             cout<<"ID trung!\n";
  46.         }
  47.         ds[i].name=readLine("Ten: ");
  48.         do {if(!readDouble("Gia: ",ds[i].price)) return;
  49.            if(ds[i].price<0)cout<<"Gia khong duoc am!\n";
  50.         }while(ds[i].price<0);
  51.         do {if(!readInt("So luong: ",ds[i].quantity)) return;
  52.            if(ds[i].quantity<0)cout<<"So luong khong duoc am!\n";
  53.         }while(ds[i].quantity<0);
  54.     }
  55. }
  56. void show(Product* ds,int n) {
  57.     for(int i=0;i<n;++i) cout<<ds[i].id<<" | "<<ds[i].name
  58.         <<" | Gia: "<<ds[i].price<<" | Ton: "<<ds[i].quantity<<'\n';
  59. }
  60. void search(Product* ds,int n) {
  61.     int id;if(!readInt("ID tim: ",id))return;
  62.     Product* p=findProduct(ds,n,id);
  63.     if(!p){cout<<"Khong tim thay!\n";return;}
  64.     cout<<p->id<<" | "<<p->name<<" | "<<p->price<<" | "<<p->quantity<<'\n';
  65. }
  66. void buy(Product* ds,int n) {
  67.     int id,k;if(!readInt("ID mua: ",id))return;
  68.     Product* p=findProduct(ds,n,id);
  69.     if(p==nullptr){cout<<"San pham khong ton tai!\n";return;}
  70.     if(!readInt("So luong mua k: ",k))return;
  71.     if(k<=0||k>p->quantity){cout<<"So luong mua khong hop le!\n";return;}
  72.     p->quantity-=k;
  73.     cout<<"Mua thanh cong! Con "<<p->quantity<<'\n';
  74. }
  75. void setPrice(Product* ds,int n,bool isManager) {
  76.     if(!isManager){cout<<"User khong duoc doi gia!\n";return;}
  77.     int id;if(!readInt("ID sua gia: ",id))return;
  78.     Product* p=findProduct(ds,n,id);
  79.     if(!p){cout<<"Khong tim thay!\n";return;}
  80.     double price;if(!readDouble("Gia moi: ",price))return;
  81.     if(price<0){cout<<"Gia khong hop le!\n";return;}
  82.     p->price=price;cout<<"Da cap nhat gia!\n";
  83. }
  84. bool login(bool& isManager) {
  85.     int role;if(!readInt("1.Manager 2.User: ",role))return false;
  86.     if(role==2){isManager=false;return true;}
  87.     if(role==1){string pass=readLine("Mat khau manager: ");
  88.         if(pass=="M123"){isManager=true;return true;}}
  89.     cout<<"Dang nhap that bai!\n";return false;
  90. }
  91. int main(){
  92.     int n;if(!readInt("Nhap n (1..1000): ",n)||n<1||n>1000)return 0;
  93.     Product* ds=new Product[n];input(ds,n);
  94.     int mainChoice=-1;
  95.     do {
  96.         if(!readInt("\n1.Dang nhap 0.Thoat: ",mainChoice))break;
  97.         if(mainChoice==1){bool isManager=false;
  98.             if(!login(isManager))continue;
  99.             int choice=-1;
  100.             do{
  101.                 if(!readInt("\n1.Hien thi 2.Tim 3.Mua 4.Sua gia 0.Dang xuat: ",choice))break;
  102.                 switch(choice){
  103.                     case 1:show(ds,n);break;
  104.                     case 2:search(ds,n);break;
  105.                     case 3:buy(ds,n);break;
  106.                     case 4:setPrice(ds,n,isManager);break;
  107.                     case 0:break;
  108.                     default:cout<<"Lua chon sai!\n";
  109.                 }
  110.             }while(choice!=0&&!cin.eof());
  111.         }else if(mainChoice!=0)cout<<"Lua chon sai!\n";
  112.     }while(mainChoice!=0&&!cin.eof());
  113.     delete[] ds;ds=nullptr;return 0;
  114. }
  115.  
  116.  
Success #stdin #stdout 0s 5312KB
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Standard input is empty
stdout
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Nhap n (1..1000):
https://ideone.com/YuYc1K
quan ly san pham
language:
C++14 (clang 8.0)
created:
11 hours ago
visibility:
public

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