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diff --git a/CM2005 Object Oriented Programming/Topic 2/2.3.5/main.cpp b/CM2005 Object Oriented Programming/Topic 2/2.3.5/main.cpp
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+#include <iostream>
+#include <string>
+#include <vector>
+
+enum class OrderBookType
+{
+  bid,
+  ask
+};
+
+// We add a constructor
+class OrderBookEntry
+{
+  public:
+    OrderBookEntry
+    (
+      double _price,
+      double _amount,
+      std::string _timestamp,
+      std::string _product,
+      OrderBookType _orderType
+    )
+    {
+      price = _price;
+      amount = _amount;
+      timestamp = _timestamp;
+      product = _product;
+      orderType = _orderType;
+    }
+    double price;
+    double amount;
+    std::string timestamp;
+    std::string product;
+    OrderBookType orderType;
+};
+
+class OrderBookEntry2
+{
+  public:
+    OrderBookEntry2
+    (
+      double price,
+      double amount,
+      std::string timestamp,
+      std::string product,
+      OrderBookType orderType
+    )
+    {
+      this->price = price;
+      this->amount = amount;
+      this->timestamp = timestamp;
+      this->product = product;
+      this->orderType = orderType;
+    }
+    double price;
+    double amount;
+    std::string timestamp;
+    std::string product;
+    OrderBookType orderType;
+};
+
+int main()
+{
+  OrderBookEntry order1{  10000,
+                          0.002,
+                          "2020/03/17 17:01:24.884492",
+                          "BTC/USDT",
+                          OrderBookType::bid};
+  OrderBookEntry2 order2{  50000,
+                           0.002,
+                          "2020/03/17 17:01:24.884492",
+                          "BTC/USDT",
+                          OrderBookType::bid};
+  // order1.price = 10000;
+  // order1.amount = 0.002;
+  // order1.timestamp = "2020/03/17 17:01:24.884492";
+  // order1.product = "BTC/USDT";
+  // order1.orderType = OrderBookType::bid;
+
+  std::cout << order1.price << std::endl;
+  std::cout << order2.price << std::endl;
+}
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