Find the center letter in 2 pdf (2 stack) in automata
Draw a 2PDA that accepts MIDDLE A of all words that have A as the middle letter.
Also, Explain the Logic of it.
Solution
It is a hard question for the beginners
But you can solve it by using little bit concentration.
It is simple...
- Read the first letter from and discard it and if the stack has only one letter then check it must be
aother move forward. - The read all the string and put it in the 1-stack.
- Pop the letter from the 1-stack and discard it.
- The pop all the letters and push all the letters it in the 2-stack.
- The repeat the step 2 with the 2-stack.
If you pop a letter from a stack and it isaand both stacks are empty then the string is accepted.
Happy Coding.
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