Final questions of exam #2

Author: aubertc

source/solutions/oop/inheritance.md

@@ -69,6 +69,15 @@ tags:
     - [x] Need to be inside an `abstract` class
     - [x] Not be overriden
 
+#. A method …
+
+    - [ ] … can be accessed from any class if it is marked `protected`.
+    - [ ] … can be accessed from its derived classes if it is marked `private`.
+    - [ ] … is recursive if it terminates.
+    - [x] … is recursive if it calls itself.
+    - [x] … must be overridden if it is marked `abstract`.
+    - [ ] … cannot be overriden if it is marked `sealed`.
+
 #. Give at least two differences between an abstract class and an interface.
 
     <details><summary>Solution</summary>

source/solutions/oop/references.md

@@ -53,6 +53,22 @@ tags:
     - [ ] The keyword `out` cannot be used in the header of a method.
     - [ ] An `out` parameter cannot be assigned a value.
 
+#. A method is forced to set the value of an `int` argument `c` passed as a reference, if it has…
+
+    - [x] … `out int c` in its header
+    - [ ] … `int out c` in its header
+    - [ ] … `ref int c` in its header
+    - [ ] … `int ref c` in its header
+    
+#. A method with header `public virtual void Test(int a, ref int b)` will…
+  
+    - [ ] Return a value
+    - [ ] Set the value of `a`
+    - [ ] Set the value of `b`
+    - [x] Assume that `a` has a value
+    - [x] Assume that `b` has a value
+    - [ ] Be impossible to override
+    
 ## Warm-up Exercises
 
 #. Consider the following code: