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Two Level Description

Context-free syntax of arithmetic expressions
$\begin{program} Expression~\==~Expression~(~minus~$\vert$~plus~)~Term~$\vert$~Te... ...$~Factor. \\ Factor~\\ gt=~numlit~$\vert$~lparen~Expression~rparen.\end{program}$
Lexical syntax of arithmetic expressions
$\begin{program} times~~~\==~''$*$''. \\ div~\\ gt=~''/''. \\ plus~\\ gt=~''+''. ... ...igit~\{~digit~\}. \\ digit~~\\ gt=~''0''~$\vert$~...~$\vert$~''9''.\end{program}$

Christoph Zenger
3/16/2000