gram.h

自上而下语法分析器设计,词法分析器调用接口为lex()

typedef struct token{
	char name[30];
	int code;
	int value;
}token;

enum TVAL {$END=1, $INT, $PLUS, $MINUS, $MUL, $DIV, $LPAR, $RPAR, $UNKNOWN};

enum RESULT {SUCCESS=1, FAIL};

extern int E();
extern int E1();