#include <stdio.h>#include <string.h>char c[80],t[8],ch;int s,p,m,n,sum;char *w[6]={"begin","if","then","while","do","end"};void scaner();main(){ p=0; printf("请输入一段字符(以‘#‘结束)"); do{    scanf("%c",&ch);    c[p++]=ch;           }while(ch!=‘#‘); p=0; do{    scaner();    switch(s)     {      case 11:printf("< %-10d%5d>\n",sum,s);          break;      case -1:printf("你输入了错误的单词符号\n");          getch();          exit(0);      default: printf("<%-10s%5d >\n",t,s);          break;      }    }while(s!=0);    getch(); }void scaner() {  	sum=0;    for(m=0;m<8;m++)        t[m++]=NULL;    ch=c[p++];    m=0;    while((ch==‘ ‘)||(ch==‘\n‘))    ch=c[p++];    if(((ch<=‘z‘)&&(ch>=‘a‘))||((ch<=‘Z‘)&&(ch>=‘A‘)))      {       while(((ch<=‘z‘)&&(ch>=‘a‘))||((ch<=‘Z‘)&&(ch>=‘A‘))||((ch>=‘0‘)&&(ch<=‘9‘)))      {		  t[m++]=ch;          ch=c[p++];      }      p--;      s=10;      for(n=0;n<6;n++)    if(strcmp(t,w[n])==0)       { 		s=n+1;         break;       }      }    else if((ch>=‘0‘)&&(ch<=‘9‘))      { 		while((ch>=‘0‘)&&(ch<=‘9‘))		{ sum=sum*10+ch-‘0‘;          ch=c[p++];		}    p--;    s=11;      }    else switch(ch)    {      case ‘<‘:t[m++]=ch;          ch=c[p++];		   if(ch==‘>‘)            {  s=22;               t[m++]=ch;            }          else            { 			  s=20;               p--;		  }		   if(ch==‘=‘)            {  s=21;               t[m++]=ch;            }			           break;     case ‘>‘:t[m++]=ch;          ch=c[p++];          if(ch==‘=‘)            { s=24;              t[m++]=ch;            }          else            { s=23;              p--;            }          break;     case ‘+‘: s=13;             t[m++]=ch;             break;     case ‘-‘:            s=14;            t[m++]=ch;            break;     case ‘!‘:ch=c[p++];          if(ch==‘=‘)           { s=30;             t[m++]=ch;           }          else          { s=31;             p--;          }          break;     case ‘=‘:            s=25;            t[m++]=ch;            break;     case ‘*‘: s=15;           t[m++]=ch;         		   break;     case ‘/‘: s=16;           t[m++]=ch;           break;     case ‘(‘: s=27;           t[m++]=ch;           break;     case ‘)‘: s=28;           t[m++]=ch;           break;     case ‘{‘: s=5;           t[m++]=ch;           break;     case ‘}‘: s=6;           t[m++]=ch;           break;     case ‘;‘: s=26;          t[m++]=ch;          break;     case ‘\"‘: s=32;           t[m++]=ch;           break;     case ‘#‘: s=0;           t[m++]=ch;           break;     case ‘:‘:t[m++]=ch;          ch=c[p++];           if(ch==‘=‘)            {  s=18;               t[m++]=ch;            }		   else          { s=17;             p--;		  }           break;    default: s=-1;         break;       }	   t[m++]=‘\0‘;  }