#include
#include
#include
using?namespace?std;
int?iderror=0;
char?ch=0;
char?c;
int?s[100]={0};
int?n[100]={0};//記錄行?
int?i=0j=0h=1;//h表示行?
string?w=““;
string?word=““;
ifstream?infile（“c:\\users\\jda\\desktop\\a.txt“ios::in）;
int?judge（char?d）
{int?flag=0;
?if（d>=48&&d<=57）//數字?
?flag=1;
?else?if（（d>=65&&d<=90）||（d>=97&&d<=122））//字母?
?flag=2;
?else?if（d==‘?‘||d==‘\n‘）
?flag=3;
?else?flag=4;
?return?flag;
}
void?digit（）
{
?word=word+ch;
?c=infile.get（）;
?if（judge（c）==1）?{ch=c;digit（）;}
?else?if（judge（c）==2）?cout<<“error!“<???????else?
???????{id=2;i++;s[i]=id;n[i]=h;
???????word=““;
???????w=w+c;
???????void?scan（）;scan（）;
???????}
???????}
?void?letter（）
?{?
?word=word+ch;
?c=infile.get（）;
?if（judge（c）==1||judge（c）==2）
?{ch=c;letter（）;}
?else?{if（word==“if“?||?word==“else“?||?word==“then“?||?word==“begin“?||?word==“end“?||?word==“while“||word==“do“||word==“program“||word==“var“||word==“integer“||word==“char“||word==“boolean“||word==“real“||word==“and“||word==“or“||word==“not“）
????????{if（word==“if“）id=11;
?????????else?if（word==“else“）id=12;
?????????else?if（word==“then“）id=13;
?????????else?if（word==“while“）id=14;
?????????else?if（word==“do“）id=15;
?????????else?if（word==“begin“）id=16;
?????????else?if（word==“end“）id=17;
?????????else?if（word==“program“）id=18;
?????????else?if（word==“var“）id=19;
?????????else?if（word==“integer“）id=20;
?????????else?if（word==“char“）id=21;
?????????else?if（word==“boolean“）id=22;
?????????else?if（word==“real“）id=23;
?????????else?if（word==“and“）id=43;
?????????else?if（word==“or“）id=44;
?????????else?if（word==“not“）id=45;
?????????word=““;i++;s[i]=id;n[i]=h;
?????????w=w+c;
?????????void?scan（）;scan（）;???
???????}
??????else?{id=1;word=““;i++;s[i]=id;n[i]=h;
??????w=w+c;void?scan（）;scan（）;
??????}
??????}
}?
void?yuns（）
{
word=word+ch;
c=infile.get（）;
if（c==‘=‘）
{word=word+c;
if（word==“>=“）id=34;
else?if（word==“:=“）id=32;
word=““;i++;s[i]=id;n[i]=h;void?scan（）;scan（）;}
else{if（word==“>“）id=29;
?????else?if（word==“:“）id=41;
?????word=““;i++;s[i]=id;n[i]=h;
?????w=w+c;void?scan（）;scan（）;
?????}
}
void?yuns1（）
{word=word+ch;
c=infile.get（）;
if（c==‘=‘||c==‘>‘）
{word=word+c;
if（word==“<=“）id=33;
else?if（word==“<>“）id=30;
word=““;i++;s[i]=id;n[i]=h;void?scan（）;scan（）;}
else{id=28;word=““;i++;s[i]=id;n[i]=h;
?????w=w+c;void?scan（）;scan（）;}
}
void?scan（）
{if（w!=““）
?{ch=c;w=““;}
?else
?ch=infile.get（）;
??while（ch==‘?‘||ch==‘\n‘）?
??{if（ch==‘\n‘）h++;
???ch=infile.get（）;}
???????????if（judge（ch）==1）//數字?
???????????digit（）;
???????????else?if（judge（ch）==2）?//字母?
?????????????????letter（）;
?????????????????else?if（ch==‘+‘||ch==‘-‘||ch==‘*‘||ch==‘/‘||ch==‘=‘）
????????????????{?switch（ch）
??????????????????{case?‘+‘:id=24;break;
???????????????????case?‘-‘:id=25;break;
???????????????????case?‘*‘:id=26;break;
???????????????????case?‘=‘:id=31;break;
???????????????????case?‘/‘

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????9750??2009-11-21?21:33??語法分析.cpp

?????文件????1301504??2009-12-13?10:14??語法分析.doc

-----------?---------??----------?-----??----

??????????????1311254????????????????????2