#include <stdio.h>
#include <string.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("輸入源程式,以#号結束\n");
do{
scanf("%c",&ch);
prog[p++]=ch;
}while(ch!='#');
p=0;
scaner();
switch(syn)
{case 11:printf("( %-10d%5d )\n",sum,syn);
break;
case -1:printf("you have input a wrong string\n");
getchar();
default: printf("( %-10s%5d )\n",token,syn);
}
}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--;
case '>':token[m++]=ch;
if(ch=='=')
{ syn=24;
token[m++]=ch;
{ syn=23;
p--;
case '+': token[m++]=ch;
if(ch=='+')
{ syn=17;
{ syn=13;
case '-':token[m++]=ch;
if(ch=='-')
{ syn=29;
{ syn=14;
case '!':ch=prog[p++];
{ syn=21;
token[m++]=ch;
}
{ syn=31;
p--;
}
case '=':token[m++]=ch;
{ syn=25;
{ syn=18;
case '*': syn=15;
token[m++]=ch;
break;
case '/': syn=16;
case '(': syn=27;
case ')': syn=28;
case '{': syn=5;
case '}': syn=6;
case ';': syn=26;
token[m++]=ch;
case '\"': syn=30;
case '#': syn=0;
case ':':syn=17;
default: syn=-1;
token[m++]='\0';
return 0;
