add overriding

TicketSystem/Order.cs

@@ -6,26 +6,52 @@ namespace TicketSystem
 {
     public class Order
     {
+        private List<Ticket> tickets;
+        private int price;
+        public int Price => price;
+        
+        public Order()
+        {
+            tickets = new List<Ticket>();
+            price = 0;
+        }
         
-        /// <summary>
-        /// Add the given ticket to the order
-        /// </summary>
         public void AddTicket(Ticket ticket)
         {
+            tickets.Add(ticket);
+            price += ticket.price;
         }
 
-        /// <summary>
-        /// Add the correct ticket based on its type to the order
-        /// </summary>
         public void AddTicket(TicketType type)
         {
+            Ticket t;
+            switch (type)
+            {
+                case TicketType.Child:
+                    t = new Child();
+                    tickets.Add(t);
+                    price += t.price;
+                    break;
+                case TicketType.Student:
+                    t = new Student();
+                    tickets.Add(t);
+                    price += t.price;
+                    break;
+                case TicketType.Adult:
+                    t = new Ticket();
+                    tickets.Add(t);
+                    price += t.price;
+                    break;
+            }
         }
-        
-        /// <summary>
-        /// Change the price to have the reduction on it
-        /// </summary>
+
         public void ApplyReduction()
         {
+            price = 0;
+            foreach (var ticket in tickets)
+            {
+                price += ticket.PriceWithReduction();
+            }
         }
     }
 }

TicketSystem/TicketSystem.csproj

@@ -42,7 +42,6 @@
         <Compile Include="Order.cs" />
         <Compile Include="Program.cs" />
         <Compile Include="Properties\AssemblyInfo.cs" />
-        <Compile Include="Tickets\Adult.cs" />
         <Compile Include="Tickets\Child.cs" />
         <Compile Include="Tickets\Student.cs" />
         <Compile Include="Tickets\Ticket.cs" />

TicketSystem/Tickets/Adult.cs

@@ -1,7 +0,0 @@
-namespace TicketSystem.Tickets
-{
-    public class Adult
-    {
-        
-    }
-}

TicketSystem/Tickets/Child.cs

@@ -1,6 +1,6 @@
 namespace TicketSystem.Tickets
 {
-    public class Child
+    public class Child: Ticket
     {
         public int price { get; }
 
@@ -8,5 +8,10 @@
         {
             price = 5;
         }
+        
+        public int PriceWithReduction()
+        {
+            return 2;
+        }
     }
 }

TicketSystem/Tickets/Student.cs

@@ -1,7 +1,17 @@
 namespace TicketSystem.Tickets
 {
-    public class Student
+    public class Student: Ticket
     {
+        public int price { get; }
         
+        public Student()
+        {
+            price = 10;
+        }
+
+        public int PriceWithReduction()
+        {
+            return 10-3;
+        }
     }
 }

TicketSystem/Tickets/Ticket.cs

@@ -9,11 +9,15 @@
 
     public class Ticket
     {
-        private int price { get; }
-
+        public int price { get; }
         public Ticket()
         {
             price = 20;
         }
+
+        public int PriceWithReduction()
+        {
+            return price - price/100*20;
+        }
     }
 }