parsing technique

Question

Consider an SLR(1) & LALR(1) tables  which of  the following is true??

1. shift entries are same.

2 Reduce entries are same.

3. goto entries are different.

4.error entries are different.

Comments

@Arjun Sir, Could you please explain this question. Thank you, Sir.

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This was already explained in the Parsing notes last year. I'll consolidate them and post after next week as till then is busy with GO book work. Just remind me if I forget.

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Ok Sir, Thank you.

Answer 1

here the option (3)  is totaly wrong, while option (1) is totaly ri8 but the options like (2) and (4) we cant say say directly that goto entries are different because it may or may not be similarly In error entries may or may not be different. It will solely depends on the production of grammar.

Comments

since error detecting ability of LALR(1)  parser  is greater than SLR(1) ,error entries must be different.

Answer 2

Option A will be wrong option for it.

Explanation::
Reduce enteries in the both grammar will be same.

U can check any practical example on it.

Similarly number of error enteries in the bothtypes of grammar will also be same.

Comments

Reduce entries  cannot be same in both grammar. As in LALR(1) reduce entry is placed only  into the look ahead symbol , while in SLR(1) reduce entry is placed into follow of left hand non terminal of grammar.

Due to difference of reduce entries there should be some differnece in error entries also.