Ebnf

BNF and EBNF What is BNF? It stands for Backus-Naur Form It is a playal, mathematical way to specify context-free grammars It is precise and unambiguous Before BNF, concourse specified programming languages ambiguously, i.e., with side of meat How did BNF come or so? crapper Backus presented a overbold line containing most of the elements of BNF at a UNESCO conference His presentation was about Algol 58 dick Naur fill this report and found that he and Backus interpreted Algol differently He cherished even much precision So he created what we now jazz as BNF for Algol 60 Thus BNF was first published in Algol 60 Report Who was John Backus? Backus invented FORTRAN (FORMula TRANslator), the first high-level language ever, circa 1954 Major influence on the invention of useable programming in 1970s Won the 1977 Turing introduce for BNF and FORTRAN Who was Peter Naur? Danish astronomer turned computer scientist Bor n in 1928; picture on left is from 1968 A Bit more than History BNF originally stood for Backus Normal Form In 1964, Donald Knuth wrote a letter published in Communications of the ACM in which he suggests it stand for Backus-Naur row instead This was for two reasons: To recognize Naurs contribution BNF is not technically a normal form; this would imply that there would be hardly one assort way of writing a grammar What does BNF look interchangeable?

interchangeable this: ::= | ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ::= fuddleds is sketch as (some variants use := instead) | means or Angle brackets mean a nonterminal Symbols without angl e brackets are terminals More BNF Exampl! es ::= while ( ) ::= = ::= | ::= | BNF for Expressions ::= + | - | ::= * | / | ::= ^ | ::= | ::= ( ) | |  gillyflower of EBNF Stands for lengthened Backus-Naur Form After BNF appeared with Algol 60, lots of...If you want to stomach a full essay, order it on our website: OrderEssay.net

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