/* expr-eval.bison */

%token INT
%%
line : expr '\n'      { cout << $1; }
     ;
expr : expr '+' term  { $$ = $1 + $3; }
     | term
     ;
term : term '*' fact  { $$ = $1 * $3; }
     | fact
     ;
fact : '(' expr ')'   { $$ = $2; }
     | INT
     ;