用C/C++写的词法分析器

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define IN_FILE   "in.txt"
#define OUT_FILE  "out.txt"
#define WORD_BUFFER 20
#define MAX_NUM 50


FILE *fp;
FILE *fp_out;
char word_buffer[WORD_BUFFER];

char *key[]={"int","char","float","void","const","for","if",
    "else","then","while","switch","break","begin","end"};
char *indicant[MAX_NUM];
char *num[MAX_NUM];
int indi_num = 0; /* 记录标示符的个数 */
int number = 0;   /* 记录数字的个数 */
int len_count = 0; /* 记录行数 */

void init_scaner();
void scaner();
void lexscan(char c);
int judgement(char buffer);
int judgement_num(char buffer);
void is_letter();
void is_digit();
void is_comment(char c);

void is_other(char c);
void arr_out();
int DFA(int begin, int move[],int width, int final[], int length, int(*judge)(char));

int
main()
{
    init_scaner();
    scaner();
}

void
scaner()
{
    char char_buf = fgetc(fp);
    while(char_buf != EOF) {
        lexscan(char_buf);
        char_buf = fgetc(fp);
    }

    arr_out();

    fclose(fp);
    fclose(fp_out);
    printf("\nZscaner执行完毕！\n");
}

void
init_scaner()
{