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Automata-based programming is a programming technology. [1] Its defining characteristic is the use of finite-state machines to describe program behavior. The transition graphs of state machines are used in all stages of software development (specification, implementation, debugging and documentation).
Automata-based programming is a programming paradigm in which the program or part of it is thought of as a model of a finite-state machine (FSM) or any other (often more complicated) formal automaton (see automata theory). Sometimes a potentially infinite set of possible states is introduced, and such a set can have a complicated structure, not ...
Figure 4 depicts a composition of two processes, P i and P j and a FIFO message channel C i,j, matching output actions of one automaton with identically named input actions of other automata. Thus, a send(m) i,j output performed by process P i is matched and performed with a send(m) i,j input performed by channel C i,j .
In automata theory, a deterministic pushdown automaton (DPDA or DPA) is a variation of the pushdown automaton. The class of deterministic pushdown automata accepts the deterministic context-free languages, a proper subset of context-free languages. [1]
Does nothing, but exits successfully tty: Prints terminal name uname: Prints system information unlink: Removes the specified file using the unlink function uptime: Tells how long the system has been running users: Prints the user names of users currently logged into the current host who: Prints a list of all users currently logged in whoami
Usually when speaking about suffix automata and related concepts, some notions from formal language theory and automata theory are used, in particular: [9] "Alphabet" is a finite set that is used to construct words. Its elements are called "characters";
A stack automaton, by contrast, does allow access to and operations on deeper elements. Stack automata can recognize a strictly larger set of languages than pushdown automata. [1] A nested stack automaton allows full access, and also allows stacked values to be entire sub-stacks rather than just single finite symbols.
The set of all context-free languages is identical to the set of languages accepted by pushdown automata, which makes these languages amenable to parsing.Further, for a given CFG, there is a direct way to produce a pushdown automaton for the grammar (and thereby the corresponding language), though going the other way (producing a grammar given an automaton) is not as direct.