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Which of the following actions an operator precedence parser may take to recover from an error?

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Which of the following actions an operator precedence parser may take to recover from an error?

(a) Insert symbols onto the stack

(b) Delete symbols from the stack

(c) Inserting or deleting symbols from the input

(d) All of the mentioned

I got this question during an interview.

Query is from Handle of Right sentinel Grammar in section Bottom Up Parsing of Compiler

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Correct option is (d) All of the mentioned

The explanation: All these symbols are used to recover operator precedence parser from an error.

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