语法分析

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

char prog[80],token[6];
char ch;
int syn,p,m,n,sum,kk=0;
char * rwtab[6]={"begin","if","then","while","do","end"};
main()
{
 p=0;
 printf("
please intput string:");
do
{
 ch=getchar();
 prog[p++]=ch;
}while(ch!='#');
p=0;
scaner();
lrparser();
getch();
}

/*词法扫描程序：*/
scaner()
{
 for(n=0;n<8;n++)
  token[n]=NULL;
  m=0;
  ch=prog[p++];
  while(ch==' ')ch=prog[p++];
  if((ch<='z'&&ch>='a')||(ch<='Z'&&ch>='A'))
  {
   while((ch<='z'&&ch>='a')||(ch<='Z'&&ch>='A')||(ch<='9'&&ch>='0'))
   {
    token[m++]=ch;
    ch=prog[p++];
    }
   token[m++]='