/media/sda-magnetic/david/Dok-15-2023-11-27/fernuni-hagen/cs-i-ii/old-cs-2-03/bash-programming/lex-yacc-bash-etc/yacc26.cc

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