/media/sda-magnetic/david/Dok-15-2023-11-27/fernuni-hagen/cs-i-ii/old-cs-2-03/bash-programming/lex-yacc-bash-etc/yacc23.cc

%{
#include <stdio.h>
#include <ctype.>
%}
%token NUMBER
%%
lines           :   lines expr '\n'     {printf("%d\n", $2);}
                |   lines
                ;
expr            :   expr '+' term       {$$=$1+$3;}
                |   expr '-' term       {$$=$1-$3;}
                |   term
                ;
term            :   term '*' factor     {$$=$1*$3;}
                |   term '/' factor     {$$=$1/$3;}
                |   factor
                ;
factor          :   '(' expr ')'        {$$=$2;}
                |   NUMBER
                ;