haha.h

这是一个用flex生成的计算器程序

#define MAXTOKENLEN 100
typedef union{
	char *str;
}YYSTYPE;
extern YYSTYPE yylval;
int lineno;
enum{
	UNUSED=257,
	ERROR_TOKEN,
		IF,
		THEN,
		ELSE,
		END,
		REPEAT,
		UNTIL,
		READ,
		WRITE,
		ASSIGN,
		EQ,
		LT,
		PLUS,
		MINUS,
		TIMES,
          OVER,
		  LPAREN,
		  RPAREN,
		  SEMI,
		  NUM,
		  ID
		  
};