编译原理,简单的词法分析器源代码,能识别标识符部分关键字等

#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "iostream"
//include the lib

#define IDN 100
#define INT8 101
#define INT10 102
#define INT16 103
//标识符&数字 id&int

#define IF 200
#define THEN 201
#define ELSE 202
#define WHILE 203
#define DO 204
//关键字 keywords

#define ADD 300
#define SUB 301
#define MUL 302
#define DIV 303
#define GT 304
#define LT 305
#define EQ 306
#define LP 307
#define RP 308
#define SEMI 309
//单词种别 type

#define TRUE 1
#define FALSE 0
#define ERROR -1
#define MAX 100
//macro

typedef struct
{
int type;
char value[MAX];
}TOKEN;

TOKEN token[MAX];
//全局变量存储token

bool IsLetter(char ch)
{
if((ch>='a' && ch<='z')||(ch>='A' && ch<='Z'))
return TRUE;
return FALSE;
}//判断字母

bool IsDigit(char ch)
{
if(ch>='0' && ch<='9')
return TRUE;
return FALSE;
}//判断数字