Consider the SLR(1) and LALR(1) parsing tables for a context free grammar. Which of the following statements is/are true?a)The goto part of both tables may be different.b)The shift entries are identical in both the tables.c)The reduce entries in the tables may be different.d)The error entries in the tables may be different.Correct answer is option 'B'. Can you explain this answer?

Question

Answer

SLR(1) and LALR(1) Parsing Tables

Goto Part of the Tables
The goto part of the SLR(1) and LALR(1) parsing tables may be different. The goto entries in the parsing tables represent the transitions from one state to another after a non-terminal has been reduced. Since the SLR(1) and LALR(1) parsing tables are constructed using different algorithms, the states and transitions in the tables may vary. Therefore, it is possible for the goto entries to be different in the two tables.

Shift Entries
The shift entries in the SLR(1) and LALR(1) parsing tables are identical. Shift entries represent the shift actions that are taken when a terminal symbol is encountered in a certain state. Both SLR(1) and LALR(1) parsing tables are constructed to handle the same grammar, and therefore, the shift entries in the tables will be the same. The shift actions are determined by the grammar rules and the lookahead symbols, which are the same for both SLR(1) and LALR(1) parsing tables.

Reduce Entries
The reduce entries in the SLR(1) and LALR(1) parsing tables may be different. Reduce entries indicate the reduction actions that are taken when a production rule is completed in a certain state. The SLR(1) and LALR(1) parsing tables are constructed using different algorithms, which may result in different states and transitions. As a result, the reduce entries in the tables may vary.

Error Entries
The error entries in the SLR(1) and LALR(1) parsing tables may be different. Error entries are used to indicate that a syntax error has occurred in a certain state when there is no valid action to take. Since the SLR(1) and LALR(1) parsing tables can have different states and transitions, the error entries in the tables may differ.

Conclusion
In summary, the SLR(1) and LALR(1) parsing tables can have different goto, reduce, and error entries. However, the shift entries in the tables will be identical since they are determined by the grammar rules and lookahead symbols, which are the same for both parsing algorithms. Therefore, option B is the correct answer.

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