// Interface for tokenizing a file
interface CS211InInterface {
	int INTEGER  = -1,
		WORD     = -2,
		OPERATOR = -3,
		EOF      = -4;
	
	int peekAtKind(); //returns one of the integers above
	int getInt(); 
	String getWord(); 
	char getOp();
	void match(char c);
	void match(String s);
	boolean check(char c);
	boolean check(String s);
	void pushBack();
	int lineNo();
	void close();
}