LEXICAL ANALYSIS
REGULAR EXPRESSIONS AND FINITE AUTOMATA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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type1
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type2
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type0
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type3
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Detailed explanation-1: -Conclusion: Pushdown automata accepts Context-Free Grammar Language (Type 2) in the Language Hierarchy. The stack in PDA allows it to recognize context-free languages. Context-free languages are generated by context-free grammars, which can be recognized by PDAs.
Detailed explanation-2: -If a grammar G is context-free, we can build an equivalent nondeterministic PDA which accepts the language that is produced by the context-free grammar G.
Detailed explanation-3: -Basic Structure of PDA A pushdown automaton is a way to implement a context-free grammar in a similar way we design DFA for a regular grammar. A DFA can remember a finite amount of information, but a PDA can remember an infinite amount of information.
Detailed explanation-4: -Explanation: Push down automata is for Context free languages and they are termed as Type 2 languages according to Chomsky hierarchy.