Pushdown Automata (PDA) for equal number of ‘a’ and equal number of ‘b’ | GATECSE | TOC

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Pushdown Automata (PDA) for equal number of ‘a’ and ‘b’
1. Let either 'a' or 'b' push in STACK. That means if 'a' comes first let it push.
After 'a' if again 'a' comes then let push it.
2. If 'b' comes first, push it in STACK ('a' did not come yet)
If again 'b' comes then push it in STACK.
3. Now if 'a' is present in top of STACK and 'b' comes then, pop 'a'
Similarily if 'b' is present in top of STACK and 'a' comes then, pop 'b'
4. So in the end of the strings if nothing is left in the STACK then we can say that CFL is accepted in the PDA.


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