#include?
#include?
#include?
#include?
#include?
using?namespace?std;

const?int?MAX_SIZE?=?1000000;

set?reserved_words;

void?init_reserved_words（）?{
??reserved_words.insert（“Const“）;
??reserved_words.insert（“Var“）;
??reserved_words.insert（“if“）;
??reserved_words.insert（“then“）;
??reserved_words.insert（“else“）;
??reserved_words.insert（“while“）;
??reserved_words.insert（“do“）;
??reserved_words.insert（“begin“）;
??reserved_words.insert（“end“）;
}

bool?isdigit（char?c）?{?return?c?>=?‘0‘?&&?c?<=?‘9‘;?}

bool?isalpha（char?c）?{?return?（c?>=?‘a‘?&&?c?<=?‘z‘）?||?（c?>=?‘A‘?&&?c?<=?‘Z‘）;?}

void?lexical_analysis（int?flag）?{
??freopen（“file_out.txt“?“w“?stdout）;
??char?s[MAX_SIZE];
??char?tmp[105];
??int?len?tmp_len?pos?cnt?=?0;
??while（gets（s））?{
????len?=?strlen（s）;
????cnt++;
????pos?=?0;
????while?（pos?????if?（flag）?printf（“%3d:“?cnt）;
????if?（flag）?{
??????if?（pos?==?len）
????????puts（““）;
??????else
????????printf（“?%s\n“?s?+?pos）;
????}
????while?（pos???????while?（pos???????if?（pos?==?len）?break;
??????tmp_len?=?0;
??????if?（flag）?printf（“????%3d:?“?cnt）;
??????if?（isdigit（s[pos]））?{
????????while?（pos???????????tmp[tmp_len++]?=?s[pos++];

????????tmp[tmp_len]?=?‘\0‘;
????????if?（flag）?printf（“Number?:?%s\n“?tmp）;
????????else?printf（“%d?%s\n“?cnt?tmp）;
??????}
??????else?if?（isalpha（s[pos]））?{
????????while?（pos???????????tmp[tmp_len++]?=?s[pos++];
????????tmp[tmp_len]?=?‘\0‘;
????????if?（flag）?{
??????????if?（reserved_words.count（tmp））
????????????printf（“Reserved?words?:?%s\n“?tmp）;
??????????else
????????????printf（“Identifier?:?%s\n“?tmp）;
????????}
????????else?{
??????????if?（reserved_words.count（tmp））
????????????printf（“%d?%s\n“?cnt?tmp）;
??????????else
????????????printf（“%d?%s\n“?cnt?tmp）;
????????}
??????}
??????else?{
????????while（pos???????????tmp[tmp_len++]?=?s[pos++];

????????tmp[tmp_len]?=?‘\0‘;
????????if?（flag）
??????????printf（“%s\n“?tmp）;
????????else
??????????printf（“%d?%s\n“?cnt?tmp）;
??????}
????}
??}
}

int?main（）?{
??freopen（“file_in.txt“?“r“?stdin）;
??init_reserved_words（）;
??lexical_analysis（0）;
??return?0;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-06-21?14:28??詞法分析\
?????文件??????????56??2017-12-14?20:23??詞法分析\file_in.txt
?????文件?????????152??2018-01-09?14:57??詞法分析\file_out.txt
?????文件?????????648??2018-01-09?14:56??詞法分析\file_show.txt
?????文件????????2448??2017-12-15?13:05??詞法分析\詞法分析.cpp
?????文件?????1899811??2018-01-09?14:57??詞法分析\詞法分析.exe
?????文件???????14519??2018-06-21?14:28??詞法分析\詞法分析_謝俊峰.docx
?????文件????????2975??2018-01-09?14:56??詞法分析\詞法分析展示.cpp
?????文件?????1899811??2018-01-09?14:56??詞法分析\詞法分析展示.exe