Which of the following is a requirement for an LL(1) parser?

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Question: Which of the following is a requirement for an LL(1) parser?

Options:

Correct Answer: The grammar must be free of left recursion.

Solution:

An LL(1) parser requires the grammar to be free of left recursion to ensure that it can make decisions based on a single lookahead token.

Which of the following is a requirement for an LL(1) parser?

Which of the following is a requirement for an LL(1) parser?

Step 1: Understand what an LL(1) parser is. It is a type of parser that reads input from left to right and constructs a leftmost derivation of the sentence using one lookahead token.
Step 2: Know that '1' in LL(1) means the parser looks at one token ahead to make parsing decisions.
Step 3: Recognize that left recursion in a grammar can cause the parser to enter an infinite loop because it keeps trying to expand the same non-terminal.
Step 4: Conclude that to avoid this problem, the grammar must be free of left recursion, allowing the parser to make decisions based on the single lookahead token.

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