Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 24 Sep 2017 My Price 7.00

BNF grammar

  1. Define a BNF grammar that describes the language of decimal numbers (the language should include 3.14159, 0.423, and 1120 but not 1.2.3).
  2. The BNF grammar below (extracted from Paul Mockapetris,Domain Names - Implementation and Specification, IETF RFC 1035) describes the language of domain names on the Internet.

 

     

Domain

:: ⇒

SubDomainList

SubDomainList

:: ⇒

Label | SubDomainList | . Label

Label

:: ⇒

Letter MoreLetters

MoreLetters

:: ⇒

LetterHyphens LetterDigit | ?

LetterHyphens

:: ⇒

LDHyphen | LDHyphen LetterHyphens | ?

LDHyphen

:: ⇒

LetterDigit LetterDigit | -

LetterDigit

:: ⇒

Letter Digit

Letter

:: ⇒

A | B | ... | Z | a | b | ... | z

Digit

:: ⇒

0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

 

a. Show a derivation for www.virginia.edu in the grammar.

b. According to the grammar, which of the following are valid domain names: (1) tj, (2) a.-b.c, (3) a-a.b-b.c-c, (4) a.g.r.e.a.t.d.o.m.a.i.n-

Answers

Maurice Tutor
(5)
Status NEW Posted 24 Sep 2017 11:09 AM My Price 7.00

Hel-----------lo -----------Sir-----------/Ma-----------dam-----------Tha-----------nk -----------You----------- fo-----------r u-----------sin-----------g o-----------ur -----------web-----------sit-----------e a-----------nd -----------and----------- ac-----------qui-----------sit-----------ion----------- of----------- my----------- po-----------ste-----------d s-----------olu-----------tio-----------n.P-----------lea-----------se -----------pin-----------g m-----------e o-----------n c-----------hat----------- I -----------am -----------onl-----------ine----------- or----------- in-----------box----------- me----------- a -----------mes-----------sag-----------e I----------- wi-----------ll

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