Show the LL Parse Tree (Recursive Descent Top-Down Parsing) for input "v + x - v" for the following grammar: S -> A A -> EO | F O | epsilon O -> + A | - A | epsilon E -> v F -> x
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The following grammar is $S \rightarrow A a A b / B b B a$ $A \rightarrow \varepsilon$ $B \rightarrow \varepsilon$ (A) LL (1) (B) Not LL (1) (C) Recursive (D) Ambiguous
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LEXICAL ANALYSIS AND PARSING
Use top-down parsing to determine whether each of the following strings belongs to the language generated by the grammar in Example $12 .$ $$ \begin{array}{ll}{\text { a) } b a b a} & {\text { b) } a b a b} \\ {\text { c) } c b a b a} & {\text { d) } b b b c b a}\end{array} $$
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Which of following grammars are unambiguous? (A) $S \rightarrow(S) S|[S] S| \varepsilon$ (B) $S \rightarrow S(S) S \mid \varepsilon$ (C) $S \rightarrow a S|S a| a$ (D) $S \rightarrow a|S a| b S S|S s b| S b S$
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