Question: 7 . [ 2 0 marks ] How does depth first search work? What does discover and finish node stand for? 8 . [ 2

7.[20 marks] How does depth first search work? What does discover and finish node stand for?
8.[20 marks] What are the advantages of being able to evaluate expressions without specifying actions
within the grammar?
9.(15 points) In chapter 5, we discussed augmenting grammars with actions. Other than simple grammar
augmentation such as printing the token type, what other augmentation can be performed in grammar
rules? Hint: We can declare variables to be used in actions.
10.(15 points) What are the differences between listener and visitor?

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