PPT Slide
lexical rules: rules that define the valid
syntactic rules: rules that specify the
allowable arrangement of tokens in
BNF (Backus - Naur Form*): a formal
language for specifying the syntax of
a language, including both lexical rules
*John Backus defined ALGOL60 with a formal grammar+.
Peter Naur was the editor of the ALGOL60 report.
+Context-free grammars are studied in CSE 322.