Visualization of Pushdown Automata       Pradip Peter Dey et al, National University
Pushdown Automata (PDA) are acceptors of context-free languages which include programming languages such as C++ and Java. A Pushdown Automaton for a non-regular Context-Free Language, Lm = {        {nc}n : where n >=0         }, is shown in action with an input string "{{c}}" .     Lm is a language with matching number of     {'s     and }'s     seperated by one "c". Programming languages such as Java have balanced {'s     and }'s. Press the START_ANIMATION button for invoking the aimation. The machine starts execution from the start state. The moving arrow shows the execution path and the underlined input symbol shows the current symbol being processed. Zo is the start symbol which is used as the bottom marker of the stack following Hopcroft, Motwani, & Ullman, (2007) Introduction to Automata Theory, Languages, and Computation. For more on PDA, Please click Here!
A Pushdown Automaton for Lm = {        {nc}n : where n >=0         }     =     {     c,   {c},   {{c}},   {{{c}}},   {{{{c}}}}, . . .       }
For more on PDA, please

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