/media/sda-magnetic/david/Dok-15-2023-11-27/fernuni-hagen/cs-i-ii/old-cs-2-03/bash-programming/lex-yacc-bash-etc/yacc-bsp-00001.txt

%{
#include <stdio.h>
#include <ctype.h>
%}
%token NUMBER
%%
lines   : lines expr '\n'
        | lines '\n'
        |
        ;
expr    : expr '*' term
        | expr '\' term
        | term
        ;
term    : term '+' factor
        | term '-' factor
        | factor 
        ;
factor  : 
        | '(' expr ')'
        | NUMBER
        ;