Thanks, this is great. I am now learning by seeing what I am doing wrong and by correcting those mistakes.
I think it is ridiculous that a learning book of this type does not contain all answers to exercises. I agree, I must learn on my own - but how can I learn if I have no possibility of knowing if I am doing it correctly? How can I see if I'm doing something right?
More importantly, how am I to see what I am doing wrong so that I may correct my mistakes and learn from them? I simply can't have my lecturer go through them individually.
This type of work, like in mathematics, should have an answer sheet to the exercises.