get rid of warnings with not used variables

Author: christiannagel

1_CS/CoreCSharp/NullableReferenceTypes/Program.cs

@@ -20,6 +20,9 @@
 string title = b2.Title;
 string? publisher = b2.Publisher;
 
+Console.WriteLine(title);
+Console.WriteLine(publisher);
+Console.WriteLine(b1);
 
 class Book
 {

1_CS/CoreCSharp/VariableScopeSample2/Program.cs

@@ -1,6 +1,6 @@
 int j = 20;
 for (int i = 0; i < 10; i++)
 {
-    int j = 30; // Can't do this — j is still in scope
+    // int j = 30; // Can't do this — j is still in scope - uncomment to get the compilation error
     Console.WriteLine(j + i);
 }