%{
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include "lex.yy.c"
extern int yylval;
 int symcount=0;


typedef int YYSTYPE;
 %}
%token IF
%token ELSE
%token ENDIF
%token ID
%token ASSIGN
%token NUM
%token PRINT
%left '+' '-'
%left '*' '/'
%left UMINUS
%token THEN


%start stmtlist

%%
stmtlist: stmtlist  stmt  
| stmt 
;
stmt: ID ASSIGN expr ';' { sym_tbl[$1].value=$3;}
| PRINT expr ';' { printf("%d\n", $2); }
   ;
expr : expr '+' expr  { $$=$1+$3;}
    | expr '-' expr { $$ =$1-$3; }
     | expr '/' expr  { $$ = $1/$3;}
| expr '*' expr { $$ = $1*$3; }
| '(' expr ')' { $$ =  $2;}
       | ID { $$=sym_tbl[$1].value;}
       | NUM {$$ = sym_tbl[$1].value;}
       ;

%%

void main()
{
  do 
    {
      yyparse();
    }
  while(!feof(stdin));
}

void yyerror(char *msg)
{
 printf("%s\n",msg);
}