If-else and while in yacc

smishra@ccd.harris.com (Sanjoy Mishra)
Fri, 3 Dec 1993 14:52:51 GMT

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If-else and while in yacc smishra@ccd.harris.com (1993-12-03)
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Newsgroups: comp.compilers
From: smishra@ccd.harris.com (Sanjoy Mishra)
Keywords: parse, question
Organization: Compilers Central
Date: Fri, 3 Dec 1993 14:52:51 GMT

    <novice>


Hi:


I am looking for a good illustration and/or document on how
to implement if-then-else and while-loop construct using lex/yacc
type of grammars. Do I need to have stack for nesting these construct ?


I need this for a evaluator I am building. Something like


    if a = 5
    then
      a = a + 1
    else
      a = a + 2


I want to do this evaluation from within yacc/lex code rather than building
any interpretive or compiling code.


  Thanks for all your help.


-Sanjay
__
Sanjay K. Mishra Harris Controls Division
mishra@ccd.harris.com 407 John Rodes Blvd.
Phone: (407)242-4333 Melbourne, FL 32905
Fax: (407)242-4453
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