#include <stdio.h>#include <string.h>#include <stdlib.h>char prog[80],token[8],ch;int syn,p,m,n,sum;char *rwtab[6]={"begin","if","then","while","do","end"}; scaner();main(){p=0; printf("\n please input a string(end with ‘#‘):/n"); do{    scanf("%c",&ch);    prog[p++]=ch;    }while(ch!=‘#‘); p=0; do{    scaner();    switch(syn)     {case 11:printf("( %-10d%5d )\n",sum,syn);          break;      case -1:printf("you have input a wrong string\n");          getchar();          exit(0);      default: printf("( %-10s%5d )\n",token,syn);          break;      }    }while(syn!=0);    getchar(); }  scaner() {  sum=0;    for(m=0;m<8;m++)token[m++]=NULL;    ch=prog[p++];    m=0;    while((ch==‘ ‘)||(ch==‘\n‘))ch=prog[p++];    if(((ch<=‘z‘)&&(ch>=‘a‘))||((ch<=‘Z‘)&&(ch>=‘A‘)))      { while(((ch<=‘z‘)&&(ch>=‘a‘))||((ch<=‘Z‘)&&(ch>=‘A‘))||((ch>=‘0‘)&&(ch<=‘9‘)))      {token[m++]=ch;       ch=prog[p++];      }      p--;      syn=10;      for(n=0;n<6;n++)    if(strcmp(token,rwtab[n])==0)       { syn=n+1;         break;       }      }    else if((ch>=‘0‘)&&(ch<=‘9‘))      { while((ch>=‘0‘)&&(ch<=‘9‘))    { sum=sum*10+ch-‘0‘;      ch=prog[p++];    }    p--;    syn=11;      }    else switch(ch)    { case ‘<‘:token[m++]=ch;          ch=prog[p++];           if(ch==‘=‘)            {  syn=22;               token[m++]=ch;            }          else            {  syn=20;               p--;            }          break;     case ‘>‘:token[m++]=ch;          ch=prog[p++];          if(ch==‘=‘)            { syn=24;              token[m++]=ch;            }          else            { syn=23;              p--;            }          break;     case ‘+‘: token[m++]=ch;          ch=prog[p++];          if(ch==‘+‘)            { syn=17;              token[m++]=ch;            }          else            { syn=13;              p--;            }          break;      case ‘-‘:token[m++]=ch;          ch=prog[p++];          if(ch==‘-‘)            { syn=29;              token[m++]=ch;            }          else            { syn=14;              p--;            }          break;      case ‘!‘:ch=prog[p++];          if(ch==‘=‘)           { syn=21;             token[m++]=ch;           }          else          { syn=31;             p--;          }          break;      case ‘=‘:token[m++]=ch;          ch=prog[p++];          if(ch==‘=‘)            { syn=25;              token[m++]=ch;            }          else            { syn=18;              p--;            }          break;     case ‘*‘: syn=15;           token[m++]=ch;           break;     case ‘/‘: syn=16;           token[m++]=ch;           break;     case ‘(‘: syn=27;           token[m++]=ch;           break;     case ‘)‘: syn=28;           token[m++]=ch;           break;     case ‘{‘: syn=5;           token[m++]=ch;           break;     case ‘}‘: syn=6;           token[m++]=ch;           break;     case ‘;‘: syn=26;          token[m++]=ch;          break;     case ‘\"‘: syn=30;           token[m++]=ch;           break;     case ‘#‘: syn=0;           token[m++]=ch;           break;     case ‘:‘:syn=17;           token[m++]=ch;           break;    default: syn=-1;         break;       }    token[m++]=‘\0‘;    }