using namespace std;
#include <iostream>
#include <stdio.h>

extern FILE* yyin;
int yyparse();

int main(int argc, char* argv[])
{
   if (argc != 2)
   {
      cerr << "Usage: lunch filename" << endl;
      exit(1);
   }
   yyin = fopen(argv[1], "r");
   if (!yyin)
   {
      cerr << "Unable to open " << argv[1] << endl;
      exit(1);
   }
   yyparse();
   cout << "Great, let's eat!" << endl;
}