C语言带词法分析的语法分析器

#include "stdio.h"
#include "string.h"
char prog[100],token[8],ch;
char *rwtab[6]={"main","if","else","while","int","char"};
int syn,p,m,n,sum;
int kk;
mainfunc();
factor();//
expression();
yucu();
term();
statement();
lrparser();
scaner();




main()
{
FILE * fp;
char filename[10];
 p=kk=0;
 printf("\n请输入文件名（含路径）: \n");
 gets(filename); 
if((fp=fopen(filename,"r"))==NULL)
{
printf("无法打开此文件");
exit(0);
}

else while(!feof(fp)){
prog[p++]=fgetc(fp);

//n++;
}

/*do
   { scanf("%c",&ch);
     prog[p++]=ch;
   }while(ch!='#');*/
 p=0;
 scaner();
 lrparser();
 getchar();
}


/*========================语法分析=======================*/
lrparser()
{
 if(syn==1)
   { 
     //scaner();       /*读下一个单词符号*/
     mainfunc();
     }
else{
if((syn!=5)&&(syn!=6))
{
printf("无效的little C程序\n");
kk=1;