Download e-book for iPad: Analisis Estructurado Moderno Spanish by Edward Yourdon

By Edward Yourdon

ISBN-10: 9688803030

ISBN-13: 9789688803035

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If more than one parse tree exists for some w in L(G), then G is said to be an "ambiguous" grammar. Therefore, the grammar having the productions E → E + E | E * E | id is an ambiguous grammar, because there exists more than one parse tree for the string id + id * id in L(G) of this grammar. 4. 4: Ambiguous grammar parse trees. The parse tree construction process is such that the order in which the nonterminals are considered for replacement does not matter. That is, given a string w, the parse tree for that string (if it exists) can be constructed by considering the nonterminals for derivation in any order.

The nonterminals that are not marked are those not deriving to w in T *. After identifying the nonterminals that do not derive to w in T *, we eliminate all productions containing these nonterminals in order to obtain a grammar that does not contain any nonterminals that do not derive in T *. The algorithm for identifying as well as eliminating the nonterminals that do not derive to w in T * is given below: Input: G = (V, T, P, S) Output: G1 = (V1, T, P1, S) { where V1 is the set of nonterminals deriving tow in T *, we maintain V1 old and V1 new to continue iterations, and P1 is the set of productions that do not contain nonterminals that do not derive to w in T *} Let U be the set of nonterminals that are not capable of deriving to w in T *.

24: Automata that accepts binary strings that are divisible by three. 1 Regular Sets A regular set is a set of strings for which there exists some finite automata that accepts that set. That is, if R is a regular set, then R = L(M) for some finite automata M. Similarly, if M is a finite automata, then L(M) is always a regular set. 2 Regular Expression A regular expression is a notation to specify a regular set. Hence, for every regular expression, there exists a finite automata that accepts the language specified by the regular expression.

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Analisis Estructurado Moderno Spanish by Edward Yourdon

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