%{
extern int yylval;
%}

%%
[0-9]+ {
    yylval = atoi(yytext);
    return NUM;
}
"+" return ADD;;
"-" return SUB;
"*" return MUL;
"/" return DIV;
"(" return LPAR;
")" return RPAR;
\n return 0;
%%

int yywrap() {
    return 1;
}