%{
#include <stdio.h>
#include "y.tab.h"

extern char	*yytext;
extern FILE	*yyin;

%}

%token NUMBER
%start	S

%%
S	: expr '+' expr
	{
	    $$ = $1 + $3;
	    printf( "%d\n", $$ );
	}
	| expr
	{
	    $$ = $1;
	    printf( "%d\n", $$ );
	}
	;
expr	: NUMBER
	{
	    $$ = yylval;
	    printf( "Tok is %s\n", yytext );
	}
	;
%%
int main( int argc, char *argv[] )
{
    FILE	*fp = NULL;
    int		retval;

    if( (argc > 1) && ((fp = fopen( argv[1], "r" )) != NULL) )
	yyin = fp;

    retval = yyparse();

    if( fp != NULL )
	fclose( fp );

    return( retval );
}

int yyerror( str )
char	*str;
{
    printf( str );
}