Homework #2 - Inheritance, Indexer & IEnumerable

Assignment

• Download a project PV178.Homework2.zip.
• Look for TODO comments and write missing parts. Follow the instructions in the comments.

Submitting

• Submit your homework as three separate files Square.cs, Circle.cs and Canvas.cs.
• Deadline: 23:59 21.3.2010

Tips

• You can see the list of all the TODO comments in Task list (View > Task list).
• For storing the shapes inside the Canvas class, you may use an array, or some collection, that's up to you.
• Prior to submitting, compile and test your homework at least with the provided Main method.

Links

Seminar

• inheritance
• keywords: base, virtual, override, new and abstract
• early vs. late binding, overriding (override) vs. hiding (new)
• sealed classes
• Explicit vs implicit interface implementation
• indexers
• implementing IEnumerable, yield return, yield brake