Working on final exam problems & solutions.

Author: aubertc

source/solutions/oop/inheritance.md

@@ -19,39 +19,58 @@ tags:
 
 ## Problem
 
-Consider the following diagram:
+#. Consider the following diagram:
 
-!include uml/cla/RoomClassroomOffice.md
+  !include uml/cla/RoomClassroomOffice.md
 
-Suppose you are given an implementation of the `Room` class, such that 
+  Suppose you are given an implementation of the `Room` class, such that 
 
-```
-!include`snippetStart="// Question 1",snippetEnd="// Refer to Classroom.cs for a solution"` code/projects/RoomClassroomOffice/RoomClassroomOffice/Program.cs
-```
+  ```
+  !include`snippetStart="// Question 1",snippetEnd="// Refer to Classroom.cs for a solution"` code/projects/RoomClassroomOffice/RoomClassroomOffice/Program.cs
+  ```
 
-displays
+  displays
 
-```text
-UH 243
-```
+  ```text
+  UH 243
+  ```
 
-#. Write an implementation of the `ClassRoom` class. Your `ToString` method should display the room's building and number, in addition to whether it has AV set-up.
+  #. Write an implementation of the `ClassRoom` class. Your `ToString` method should display the room's building and number, in addition to whether it has AV set-up.
 
-    <details><summary>Solution</summary>
-    ```
-    !include code/projects/RoomClassroomOffice/RoomClassroomOffice/Classroom.cs
-    ```
-    </details>
+      <details><summary>Solution</summary>
+      ```
+      !include code/projects/RoomClassroomOffice/RoomClassroomOffice/Classroom.cs
+      ```
+      </details>
 
-#. Write a `SameBuilding` static method to be placed inside the `Room` class such that
+  #. Write a `SameBuilding` static method to be placed inside the `Room` class such that
 
-    ```
-    !include`snippetStart="// Question 2",snippetEnd="// Refer to Room.cs for a solution.",dedent=4` code/projects/RoomClassroomOffice/RoomClassroomOffice/Program.cs
-    ```
-    Would display "true" and "false".
+      ```
+      !include`snippetStart="// Question 2",snippetEnd="// Refer to Room.cs for a solution.",dedent=4` code/projects/RoomClassroomOffice/RoomClassroomOffice/Program.cs
+      ```
+      Would display "true" and "false".
+      
+      <details><summary>Solution</summary>
+      ```
+      !include`snippetStart="// (not on UML diagram)",snippetEnd="// Note that since we are inside the class,"` code/projects/RoomClassroomOffice/RoomClassroomOffice/Room.cs
+      ```
+      </details>
+
+#. Consider the following diagram:
+
+      !include uml/cla/Article.md
+
+    #. Write a (partial) implementation of the `Article` abstract class:
+
+        #. Write an implementation for the `price` attribute: you can either use a getter and a setter (as pictured in the UML diagram), or a property. However, in both cases, setting the price to a negative value should result in an `ArgumentOutOfRangeException` (that you can shorten to `AOORE`) exception being thrown.
+        #. Write an *abstract* `ShippingCosts()` method.
+
+    #. Now, assume given a complete implementation of the `Article` abstract class. Write a **complete** implementation of the `Book` class (header included), containing:
+        #. An implementation of the `Title` property using auto-properties.
+        #. A `Book` constructor that passes the `idP` and `priceP` arguments to the `Article` constructor. The `titleP` argument should be assigned to the `Title` property.
+        #. A `ShippingCosts()` method that returns either $5.0$, or 10% of the Book's price, whichever is smallest.
 
-    <details><summary>Solution</summary>
-    ```
-    !include`snippetStart="// (not on UML diagram)",snippetEnd="// Note that since we are inside the class,"` code/projects/RoomClassroomOffice/RoomClassroomOffice/Room.cs
-    ```
-    </details>
+    #. Write statements that, if placed in a `Main` method, would
+        #. Create a `Book` with `Id` "AAA001", `price` $12.5, titled "What it's like to be a bird".
+        #. Display (nicely) its shipping costs.
+        #. Display its `Id` (as retrieved from the object).