localauthormaterial1.1

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operator precendence parsing

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Operator Precedence Parsing ·           The grammars that have the property that no production right side is ε or has two adjacent nonterminals. ·           A grammar with the later property is called an operator grammar. ·           The following grammar for expressions is  not  an operator grammar: E → E A E | ( E ) | - E | id A → + | - | * | / | ^                                         o     Because the right side EAE has two consecutive nonterminals. ·           To obtain the (Grammar 2.9.1) as operator grammar, substitute for A each of its alternatives for production E.                ...
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prg 3&4

Aim: To write a program to implement Ambiguous grammar using YACC and LEX. Grammar: E->E+E | E-E |E*E | E/E|(E)|id Step 1: Start the program. Step 2: Declare yyerror, yylval. Step 3: Include the required header files.                                                                                                                                ...
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