Re: Examples of Bison files

[Hans Aberg]

>I create some kind of grammar (BNF) to describe geometrical
>construction. Bison understand this grammar, but I found problem how
>to add action to all of expressions.
>So, I'm looking for every kind of examples. Maybe it helps me better
>understand Bison.

I send you an example of a simple C++ calculator (next email), which I
think I published in this group some time ago. The Bison manual has more
similar examples.

Each terminal or nonterminal has a $ value.  For example
  expr: expr '+' expr   { $$.value = $1.value + $3.value }
means: Add value of first and third token (= terminal), and assign that to
the value of the left hand side nonterminal (= the rule value, as the
grammar is context free).

  Hans Aberg