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Pushdown Automata Theory
Pushdown automata are computational models that extend finite automata with a stack, allowing them to recognize context-free languages. They consist of a finite state control unit, an input tape, and an infinite stack that supports push and pop operations, making them more powerful than finite state machines. Pushdown automata provide a way to implement context-free grammars similarly to how finite automata are used for regular grammars.
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Pushdown Automata Theory
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- 2. Definition A Pushdown Automata(PDA) is a way to implement a Context Free Grammar in a similar way we design Finite Automata for Regular Grammar. Pushdown automata are like Nondeterministic Finite Automata but have an extra component called Stack.
- 3. Properties of PushdownAutomata 1. It is more powerful than Finite State Machine (FSA). 1. FSA has a very limited memory but PDA has more memory. 1. PDA = Finite State Machine + Stack.
- 4. Stack A stack isway we arrange elements one on top of another. A stack does two basic operation: 1. PUSH: A new element is added at the top of stack. 2. POP: The top element of the stack is read and removed.
- 5. Components of Pushdown Automata 1.An Input tape. 2. A Finite Control Unit. 3. A Stack with infinite size.
- 6. Components of PushdownAutomata
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