computing LOOKAHEAD sets

Vangelis Katsikaros <>
31 Aug 2005 00:36:58 -0400

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Related articles
computing LOOKAHEAD sets (Vangelis Katsikaros) (2005-08-31)
Re: computing LOOKAHEAD sets (J.H.Jongejan) (2005-09-02)
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From: Vangelis Katsikaros <>
Newsgroups: comp.compilers
Date: 31 Aug 2005 00:36:58 -0400
Organization: Compilers Central
Keywords: analysis
Posted-Date: 31 Aug 2005 00:36:58 EDT

I am a computer science student and I would like to ask something. I
cant fully understand how I compute the LOOKAHEAD set for a grammar.

For my exams we use LOOKAHEAD to identify a LL(1) grammar. The procces
includes computing firstly FIRST and FOLLOW sets. Then using them we can
compute the LOOKAHEAD. But I cant fully understand this second process.

I know how to compute FIRST and FOLLOW set and I would like a
description or algorithm for computing the LOOKAHEAD from these.

Thank you
Vangelis Katsikaros

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