C语言词法分析器实现：识别保留字与标识符

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

char *key0[]={" ","auto","break","case","char","const","continue","default","do","double","else","enum","extern","float","for","goto","if","int","long","register","return","short","signed","sizeof","static","struct","switch","typedef","_Complex","_Imaginary","union","unsigned","void","volatile","while"};
/*保留字表*/
char *key1[]={" ","(",")","[","]","{","}",",",";","'"};
/*分隔符表*/
char *key2[]={" ","+","-","*","/","%","<",">","==",">=","<=","!=","!","&&","||","<<",">>","~","|","^","&","=","?:","->","++","--",".","+=","-=","*=","/="};
/*运算符表*/
int xx0[35],xx1[10],xx2[31];

int temp_key3=0,temp_c40=0,temp_c41=0,temp_c42=0,temp_c43=0;

/*******   初始化函数   *******/

void load()
{
int mm;
for (mm=0;mm<=34;mm++)
{
xx0[mm]=0;
}
for (mm=0;mm<=9;mm++)
{
xx1[mm]=0;
}
for (mm=0;mm<=30;mm++)
{
xx2[mm]=0;

}
FILE *floading;
if ((floading=fopen("key0.txt","w"))==NULL)
{
printf("Error! Can't create file : key0.txt");
return;
}
fclose (floading);
/*建立保留字表文件：key0.txt*/
if ((floading=fopen("key1.txt","w"))==NULL)
{
printf("Error! Can't create file : key1.txt");
return;
}
/*建立分隔符表文件：key1.txt*/
if ((floading=fopen("key2.txt","w"))==NULL)
{
printf("Error! Can't create file : key2.txt");
return;
}
fclose(floading);
/*建立运算符表文件：key2.txt*/
if ((floading=fopen("key3.txt","w"))==NULL)
{
printf("Error! Can't create file : key3.txt");
return;
}
fclose (floading);
/*建立标识符表文件：key3.txt*/
if ((floading=fopen("c40.txt","w"))==NULL)