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Question:
Published on: 21 January, 2025

Convert the Regular Expression  into e-NFA and then corresponding DFA.

Answer:

 

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Describe various actions of a shift reduce parsers.
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Consider the grammar:

S → aSbS | bSaS | 𝜖

  • Show that this grammar is ambiguous by constructing two different left most derivations for the sentence abab.
  • Construct the corresponding right most derivations for abab.
  • Construct the corresponding parse tree for abab.
  • What language does this grammar generate?
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Compare quadruples, triples and indirect triples.

x= (a + b) * - c / d

Represent this expression in quadruples, triples and indirect triples forms. Generate the machine code for the following instruction:

V=a+(b*c)-d.
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Write short notes on:

  • LEX
  • YACC
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Draw the syntax tree and DAG from the following expression.

if x>0 then x=3*(y+1) else y=y+1
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