# Lhs.eyp
%right '='
%left '-' '+'
%left '*' '/'
%left NEG
%%
input:
/* empty */
| input line
;
line:
'\n'
| exp '\n'
;
exp:
NUM
| VAR
| %name ASSIGN
VAR '=' exp
| %name PLUS
exp '+' exp
| %name MINUS
exp '-' exp
| %name TIMES
exp '*' exp
| %name DIV
exp '/' exp
| %name UMINUS
'-' exp %prec NEG
| '(' exp ')'
;
%%