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  1. #include <iostream>
  2. #include <string>
  3. #include <unordered_map>
  4. #include <memory>
  5.  
  6. /**************** Item: defined as a pure abstract class ************************ **/
  7. class Item
  8. {
  9. protected:
  10.     int m_code;
  11.     int m_price;
  12.     int m_quantity;
  13. public:
  14.     Item() = default;
  15.  
  16.     void setCode(const int& code)   {   m_code = code;  }
  17.     void setPrice(const int& price)   {   m_price = price;  }
  18.     void setQuantity(const int& quantity)   {   m_quantity = quantity;  }
  19.  
  20.     /*const int& getCode()const { return m_code;  }
  21.     const int& getPrice()const { return m_price;  }
  22.     const int& getQuantity()const { return m_quantity;  }*/
  23.  
  24.     virtual int calculateStockValue() = 0;
  25.     virtual ~Item(){ };
  26. };
  27.  
  28. /** ItemTable : inherits from Item, to store code - price - quantity to hash table **/
  29. class ItemTable: public Item
  30. {
  31. private:
  32.     std::unordered_map<int, std::pair<int,int>> m_itemTable;
  33. public:
  34.     ItemTable() = default;
  35.     //(ii) to display the data members according to the item code
  36.     void displayItem(const int& code)
  37.     {
  38.         if(m_itemTable.find(code) != m_itemTable.cend())
  39.         {
  40.             auto it = m_itemTable.find(code);
  41.             std::cout << "Item code = " << it->first;
  42.             std::cout << "\t price = " << it->second.first;
  43.             std::cout << "\t quantity = " << it->second.second << std::endl;
  44.         }
  45.         else
  46.             std::cout << "Invalid Item code!" << std::endl;
  47.     }
  48.     // (iii) appending Item to the list
  49.     void appendItem(const int& code, const  int& price, const int& quantity)
  50.     {
  51.         //(i) input the data members
  52.         setCode(code);
  53.         setPrice(price);
  54.         setQuantity(quantity);
  55.         m_itemTable.emplace(m_code, std::make_pair(m_price, m_quantity));
  56.     }
  57.     // (iv) delete the Item from the list
  58.     void deleteItem(const int& code)
  59.     {
  60.         if(m_itemTable.find(code) != m_itemTable.cend())
  61.         {
  62.             std::cout << "The item with code: " << code
  63.                     << " has been deleted successfully!" <<std::endl;
  64.             m_itemTable.erase(m_itemTable.find(code));
  65.         }
  66.         else
  67.             std::cout << "Invalid Item code!" << std::endl;
  68.     }
  69.     // (v) total value of the stock
  70.     virtual int calculateStockValue() override
  71.     {
  72.         int m_totalStock = 0;
  73.         for(const auto &it:m_itemTable)
  74.             m_totalStock += (it.second.first * it.second.second);
  75.  
  76.         return m_totalStock;
  77.     }
  78.     virtual ~ItemTable(){ };
  79. };
  80. /********************* main ******************************/
  81. int main()
  82. {
  83.     int number;
  84.     int code;
  85.     std::unique_ptr<ItemTable> obj = std::make_unique<ItemTable>();
  86.  
  87.     std::cout << "Enter total number of Items : ";  std::cin >> number;
  88.  
  89.     for(int i = 0; i<number; ++i)
  90.     {
  91.         int code, price, quantity;
  92.         std::cout << i+1 << ": Enter the Item code = "; std::cin >> code ;
  93.         std::cout << i+1 << ": Enter the Item price = "; std::cin >> price ;
  94.         std::cout << i+1 << ": Enter the Item quantity = "; std::cin >> quantity ;
  95.         obj->appendItem(code, price, quantity);
  96.     }
  97.  
  98.     std::cout << "Total Value of stock = " << obj->calculateStockValue() << std::endl;
  99.  
  100.     std::cout << "Enter code of the Item to be displayed: "; std::cin >> code;
  101.     obj->displayItem(code);
  102.  
  103.     std::cout << "Enter code to delete the Item : ";         std::cin >> code;
  104.     obj->deleteItem(code);
  105.  
  106.     std::cout << "Total Value of stock = " << obj->calculateStockValue() << std::endl;
  107.  
  108.     return 0;
  109. }
  110.  
Success #stdin #stdout 0s 4164KB
comments (?)
stdin
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3
1 20 2
2 40 2
3 80 2
2
3
stdout
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Enter total number of Items : 1: Enter the Item code = 1: Enter the Item price = 1: Enter the Item quantity = 2: Enter the Item code = 2: Enter the Item price = 2: Enter the Item quantity = 3: Enter the Item code = 3: Enter the Item price = 3: Enter the Item quantity = Total Value of stock = 280
Enter code of the Item to be displayed: Item code = 2	 price = 40	 quantity = 2
Enter code to delete the Item : The item with code: 3 has been deleted successfully!
Total Value of stock = 120
https://ideone.com/UonX7I
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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