Can even palindrome be Recognised by PDA?

Approach used in this PDA – For construction of even length palindrome, user has to use Non Deterministic Pushdown Automata (NPDA). A NPDA is basically an NFA with a stack added to it.

Which of the following can accept odd length palindrome over a B?

Discussion Forum

Can finite automata accept palindrome string?

It doesn’t take long to realise that a finite state machine cannot recognise a palindromic sequence. That is if you want to recognise sequences like AAABAAA where the number of As on either side of the B has to be the same – then you can’t use a finite state machine to do the job.

How do you convert grammar to pushdown automata?

Step 1 − Convert the productions of the CFG into GNF. Step 2 − The PDA will have only one state {q}. Step 3 − The start symbol of CFG will be the start symbol in the PDA. Step 4 − All non-terminals of the CFG will be the stack symbols of the PDA and all the terminals of the CFG will be the input symbols of the PDA.

How does a pushdown automata work?

A pushdown automaton reads a given input string from left to right. In each step, it chooses a transition by indexing a table by input symbol, current state, and the symbol at the top of the stack. A pushdown automaton can also manipulate the stack, as part of performing a transition.

Can a DFA recognize a palindrome number Mcq?

Can a DFA recognize a palindrome number? Explanation: Language to accept a palindrome number or string will be non-regular and thus, its DFA cannot be obtained.

Can we design PDA for all regular languages?

Every regular language is accepted by some PDA (basically, just ignore the stack…) Stack holds intermediate strings in derivation (left end at top); letters in Σ on top of stack matched against input.