GATE | GATE-CS-2005 | Question 14
The grammar A → AA | (A) | ε is not suitable for predictive-parsing because the grammar is
(D) an operator-grammar
Explanation: Since given grammar can have infinite parse trees for string ‘ε’, so grammar is ambiguous, and also A → AA has left recusion.
For predictive-parsing, grammar should be:
Attention reader! Don’t stop learning now. Practice GATE exam well before the actual exam with the subject-wise and overall quizzes available in GATE Test Series Course.
Learn all GATE CS concepts with Free Live Classes on our youtube channel.
- Free from ambiguity
- Free from left recursion
- Free from left factoring
Given grammar contains both ambiguity and left factoring, so it can not have predictive parser.
We always expect first grammar free from ambiguity for parsing. Option (A) is more strong option than option (B) here.
Quiz of this Question