Below is a guide to the marking of ex2. Note that marks may be given for 
part of a question, marks can be lost for poor presentation and unclear
reasoning. You must also show your reasoning/working. 

Q1 2 marks

Q2 2 marks

Q3 3 marks

Q4 3 marks

Q5 1 mark

Q6 2 marks

Q7 2 marks

Q8 1 mark

Q9 4 marks. Note that this is a programming question and marks may be
   lost if code is unclear, code is badly designed, inefficent, unnecessarily 
   complicated, obfuscated, bad variable names, hard to understand, ugly, or
   just wrong. That is, a working program is no guarantee of full marks. So,
   if in doubt adopt the following guiding principle ... keep it simple, 
   keep it clean, make it efficent, get it right.

NOTE: model answers (and mistakes) will be presented at the Examples Class
      on Friday the 19th of March at 1 o'clock.