diff --git a/宠物交易系统.cpp b/宠物交易系统.cpp
new file mode 100644
index 0000000..bd0aa20
--- /dev/null
+++ b/宠物交易系统.cpp
@@ -0,0 +1,422 @@
+#include<iostream>
+#include<cstring>
+#include<vector>
+#include<fstream>
+#include"list"
+using namespace std;
+class Data// ÈÕÆÚÀà
+{
+public:
+    void set_time( );
+    void show_time( );
+private:
+    bool is_time(int, int, int);
+    int year;
+    int month;
+    int day;
+};
+void Data::set_time( )
+{
+	char c1,c2;
+    cout<<"ÇëÊäÈëÈÕÆÚ(¸ñʽÄê-ÔÂ-ÈÕ)"<<endl;
+    while(1)
+    {
+		cin>>year>>c1>>month>>c2>>day;
+        if(c1!='-'||c2!='-')
+            cout<<"¸ñʽ²»ÕýÈ·£¬ÇëÖØÐÂÊäÈë"<<endl;
+        else
+            break;
+    }
+}
+void Data::show_time( )
+{
+	cout<<year<<"-"<<month<<"-"<<day<<endl;
+}
+class Pet
+{
+public:
+  PetAnimals(){}
+  PetAnimals( string Number, string Name, string Age, string Weight, string Type,
+             string Price, string People )
+{
+	Cnumber=Number;//³èÎï±àºÅ£º00£¬01£¬02 ...
+    Cname=Name;//³èÎïÃû³Æ:±´±´
+    Cage=Age;//³èÎïÄêÁ䣺20£¬14
+    Cweight=Weight;//³èÎïÖØÁ¿£¨½ï£©£º20£¬45
+    Ctype=Type;//³èÎïÖÖÀࣺcat or dog...
+
+    Cprice=Price;//³èÎï¼Û¸ñ£º20...
+    Cpeople=People;//³èÎïÖ÷ÈË£ºÐ¡Ã÷¡­
+ }
+	string Cnumber;
+	string Cname;
+	string Cage;
+	string Cweight;
+	string Ctype;
+
+	string Cprice;
+	string Cpeople;
+ };
+class guest
+{
+	public:
+		string Cnumber;
+		string Cname;
+		string Cage;
+		string Cweight;
+		string Ctype;
+
+		string Cprice;
+		string Cpeople;
+};
+class PetAnimals:public Pet
+{
+	public:
+		void Insert();//Ìí¼Ó³èÎïÐÅÏ¢
+		bool Look();//²éÕÒ³èÎïÐÅÏ¢
+		bool Change();//Ð޸ijèÎïÐÅÏ¢
+		void Show();//ÏÔʾ»òä¯ÀÀËùÓгèÎïÐÅÏ¢
+		bool Delete();//ɾ³ý³èÎïÐÅÏ¢
+		void Read();//¶ÁÈ¡³èÎïÐÅÏ¢Îļþ
+		void Write();//д³ö³èÎïÐÅÏ¢Îļþ
+};
+list<PetAnimals>PetList;//ʹÓÃË«ÏòÁ´±í
+//Ìí¼Ó³èÎïÐÅÏ¢
+void PetAnimals::Insert()
+{
+    PetAnimals Pet;
+    char ch;
+    int symbol=0;//ÅжϳèÎïÐÅÏ¢ÊÇ·ñ´æÔÚ
+    list<PetAnimals>::iterator first,last;
+    first=PetList.begin();//begin()Ö¸Á´±í¿ªÊ¼´¦
+    last=PetList.end();//end()Ö¸Á´±í½áβ´¦
+do{
+    cout<<"¡¾ÇëÊäÈë³èÎïÏà¹ØÐÅÏ¢£¡¡¿"<<endl;
+    cout<<"񅧏:";
+    cin>>Pet.Cnumber;
+    cout<<"Ãû³Æ:";
+    cin>>Pet.Cname;
+    cout<<"ÄêÁä:";
+    cin>>Pet.Cage;
+    cout<<"ÖØÁ¿:";
+    cin>>Pet.Cweight;
+    cout<<"ÖÖÀà:";
+    cin>>Pet.Ctype;
+    cout<<"¼Û¸ñ:";
+    cin>>Pet.Cprice;
+    cout<<"Ö÷ÈË:";
+    cin>>Pet.Cpeople;
+    for( ; first != last ; ++first )
+    {
+       if((Pet.Cname==(*first).Cname)&&(Pet.Cprice==(*first).Cprice)
+          &&(Pet.Ctype==(*first).Ctype))//¼ÙÉè³èÎï¿ÉÒÔÖØÃû
+         {
+            symbol=1;// Èç¹û´æÔڴ˳èÎï
+            cout<<endl<<"¸Ã³èÎïÒѾ­´æÔÚ!"<<endl;
+            cout<<"񅧏:"<<(*first).Cnumber<<endl;
+            cout<<"Ãû³Æ:"<<(*first).Cname<<endl;
+            cout<<"ÄêÁä:"<<(*first).Cage<<endl;
+            cout<<"ÖØÁ¿:"<<(*first).Cweight<<endl;
+            cout<<"ÖÖÀà:"<<(*first).Ctype<<endl;
+
+            cout<<"¼Û¸ñ:"<<(*first).Cprice<<endl;
+            cout<<"Ö÷ÈË:"<<(*first).Cpeople;
+            }
+      }
+    if(symbol==0)//Èç¹û²»´æÔڴ˳èÎï
+    {
+        PetList.insert(PetList.end(),Pet);
+      }
+    cout<<endl<<"¼ÌÐøÌí¼Ó³èÎïÐÅÏ¢[Y»òN]?";
+    cin>>ch;
+    }
+while(ch=='Y'||ch=='y');
+ }
+
+//²éÕÒ³èÎïÐÅÏ¢
+bool PetAnimals::Look()
+{
+    string name,price,type;
+    int symbol=0;
+    int option;
+    list <PetAnimals>::iterator first,last;
+ do
+  {
+     cout<<"\t¡¾ÇëÊäÈëÄã²éÕҵķ½Ê½¡¿£¡"<<endl;
+     cout<<"\t1.°´Ãû³Æ²éÕÒ"<<endl;
+     cout<<"\t2.°´¼Û¸ñ²éÕÒ"<<endl;
+     cout<<"\t3.°´ÖÖÀà²éÕÒ"<<endl;
+     cout<<"\t4.Í˳ö£¡"<<endl;
+     cin>>option;
+    switch(option)
+      {
+         case 1: cout<<"ÇëÊäÈëÃû³Æ£º";
+         cin>>name;break;
+         case 2: cout<<"ÇëÊäÈë¼Û¸ñ£º";
+         cin>>price;break;
+         case 3: cout<<"ÇëÊäÈëÖÖÀࣺ";
+         cin>>type;break;
+         case 4:break;
+       }
+		first=PetList.begin();
+		last=PetList.end();
+	for(;first!=last;++first)
+       {
+          if((name==(*first).Cname)&&(option==1))
+			{
+				symbol=1;
+				cout<<"³èÎïÃû³ÆΪ"+(*first).Cname+"³èÎïÐÅÏ¢ÈçÏ£º"<<endl;
+				cout<<"񅧏:"+(*first).Cnumber<<endl;
+				cout<<"Ãû³Æ:"+(*first).Cname<<endl;
+				cout<<"ÄêÁä:"+(*first).Cage<<endl;
+				cout<<"ÖØÁ¿:"+(*first).Cweight<<endl;
+				cout<<"ÖÖÀà:"+(*first).Ctype<<endl;
+
+				cout<<"¼Û¸ñ:"+(*first).Cprice<<endl;
+				cout<<"Ö÷ÈË:"+(*first).Cpeople<<endl;
+			}
+		  if((price==(*first).Cprice)&&(option==2))
+			{
+				symbol=1;
+				cout<<"³èÎï¼Û¸ñΪ"+(*first).Cprice+"³èÎïÐÅÏ¢ÈçÏ£º"<<endl;
+				cout<<"񅧏:"+(*first).Cnumber<<endl;
+				cout<<"Ãû³Æ:"+(*first).Cname<<endl;
+				cout<<"ÄêÁä:"+(*first).Cage<<endl;
+				cout<<"ÖØÁ¿:"+(*first).Cweight<<endl;
+				cout<<"ÖÖÀà:"+(*first).Ctype<<endl;
+
+				cout<<"¼Û¸ñ:"+(*first).Cprice<<endl;
+				cout<<"Ö÷ÈË:"+(*first).Cpeople<<endl;
+			}
+		  if((type==(*first).Ctype)&&(option==3))
+			{
+				symbol=1;
+				cout<<"³èÎïÖÖÀàΪ"+(*first).Ctype+"³èÎïÐÅÏ¢ÈçÏ£º"<<endl;
+				cout<<"񅧏:"+(*first).Cnumber<<endl;
+				cout<<"Ãû³Æ:"+(*first).Cname<<endl;
+				cout<<"ÄêÁä:"+(*first).Cage<<endl;
+				cout<<"ÖØÁ¿:"+(*first).Cweight<<endl;
+				cout<<"ÖÖÀà:"+(*first).Ctype<<endl;
+
+				cout<<"¼Û¸ñ:"+(*first).Cprice<<endl;
+				cout<<"Ö÷ÈË:"+(*first).Cpeople<<endl;
+			}
+		}
+ }
+while(option!=4);
+if((first==last)&&(symbol==0))
+  {
+	cout<<"ûÓиóèÎïÐÅÏ¢!";
+	 return false;}
+	else
+	 return true;
+	}
+
+//Ð޸ijèÎï×ÊÁÏ
+bool PetAnimals::Change()
+{
+	PetAnimals pet;
+	string name,price,type;
+	int symbol=0;
+	cout<<"ÇëÊäÈëÃû³Æ:";
+	cin>>name;
+	cout<<"ÇëÊäÈë¼Û¸ñ:";
+	cin>>price;
+	cout<<"ÇëÊäÈëÖÖÀà:";
+	cin>>type;
+	list <PetAnimals>::iterator first,last;
+	first=PetList.begin();
+	last=PetList.end();
+	for(;first!=last;++first)
+	{
+		if((name==(*first).Cname)&&(price==(*first).Cprice)&&(type==(*first).Ctype))
+		{
+			symbol=1;
+			cout<<endl<<"¸Ã³èÎïÐÅÏ¢ÕÒµ½£¬ÆäÐÞ¸ÄÇ°µÄ³èÎïÐÅϢΪ:"<<endl;
+			cout<<"񅧏:"+(*first).Cnumber<<endl;
+			cout<<"Ãû³Æ:"+(*first).Cname<<endl;
+			cout<<"ÄêÁä:"+(*first).Cage<<endl;
+			cout<<"ÖØÁ¿:"+(*first).Cweight<<endl;
+			cout<<"ÖÖÀà:"+(*first).Ctype<<endl;
+
+			cout<<"¼Û¸ñ:"+(*first).Cprice<<endl;
+			cout<<"Ö÷ÈË:"+(*first).Cpeople<<endl;
+			break;
+		}
+	}
+   if(symbol)
+	{
+		cout<<endl<<"Ð޸ĺóµÄ³èÎïÐÅϢΪ:"<<endl;
+		cout<<"ÄêÁä:";
+		cin>>pet.Cage;
+		cout<<"ÖØÁ¿:";
+		cin>>pet.Cweight;
+
+		cout<<"Ö÷ÈË:";
+		cin>>pet.Cpeople;
+		pet.Cname=name;
+		pet.Cprice=price;
+		pet.Ctype=type;
+		for(;first!=last;++first)
+		 {
+			if((name==(*first).Cname)&&(price==(*first).Cprice)&&(type==(*first).Ctype))
+			  {
+			    (*first)=pet;
+			  }
+		 }
+			return true;
+	}
+			else
+			 {
+			  cout<<"ûÓиóèÎïÐÅÏ¢!";
+			return false;
+			 }
+}
+
+//ÏÔʾËùÓгèÎïÐÅÏ¢
+void PetAnimals::Show()
+{
+	list <PetAnimals>::iterator first,last,it;
+	first=PetList.begin();
+	last=PetList.end();
+	for(;first!=last;++first)
+	{
+		cout<<"******************ÄúµÄ³èÎïÐÅÏ¢**********************"<<endl;
+		cout<<"񅧏:"<<(*first).Cnumber<<endl;
+		cout<<"Ãû³Æ:"<<(*first).Cname<<endl;
+		cout<<"ÄêÁä:"<<(*first).Cage<<endl;
+		cout<<"ÖØÁ¿:"<<(*first).Cweight<<endl;
+		cout<<"ÖÖÀà:"<<(*first).Ctype<<endl;
+
+		cout<<"¼Û¸ñ:"<<(*first).Cprice<<endl;
+		cout<<"Ö÷ÈË:"<<(*first).Cpeople<<endl;
+		cout<<"****************************************"<<endl;
+	}
+}
+
+//±£´æ³èÎïÐÅÏ¢
+void PetAnimals::Write()
+{
+	char file[256];
+	string FileName;
+	cout<<"ÇëÊäÈëÎļþÃû:(¿ÉÒÔ¼ÓÀ©Õ¹Ãû!Èç.txt)";
+	//ÈôÊäÈëÍêÕû·¾¶ÔòÔÚÄãÊäÈëµÄ·¾¶Ï¶ÁÈ¡Îļþ,·ñÔòµ½³ÌÐòËùÔÚλÖõÄÎļþ¼ÐÖжÁÈ¡
+	cin>>FileName;
+	if(FileName.find (".")>FileName.length())
+	 {
+	    FileName=FileName+".txt";
+	 }
+	//°ÑStringÐ͵Ä×Ö·û´®×ª»»³Échar*Ð͵Ä×Ö·û´®
+	strcpy(file,FileName.c_str());
+	ofstream fout(file);
+	if(!fout)
+	 {
+	    cout<<"¡ïÎļþдÈëʧ°Ü!Çë¼ì²éÄúµÄÎļþÃû!"<<endl;
+ 	    return;
+	 }
+    else
+	 {
+		list <PetAnimals>::iterator first,last;
+		first=PetList.begin();
+		last=PetList.end();
+		for(;first!=last;++first)
+		 {
+		    fout<<endl<<"±àºÅ:"<<(*first).Cnumber<<endl<<"Ãû³Æ:"<<(*first).Cname<<endl
+		           <<"ÄêÁä:"<<(*first).Cage<<endl<<"ÖØÁ¿:"<<(*first).Cweight<<endl
+		           <<"ÖÖÀà:"<<(*first).Ctype<<endl
+		           <<"¼Û¸ñ:"<<(*first).Cprice<<endl<<"Ö÷ÈË:"<<(*first).Cpeople<<endl;
+		 }
+		cout<<"¡ïÎļþ±£´æ³É¹¦!"<<endl;
+	 }
+	fout.close ();//¹Ø±Õ´ò¿ªµÄÎļþ
+}
+
+//¶ÁÈ¡³èÎïÐÅÏ¢
+void PetAnimals::Read()
+{
+	char file[256];
+	string FileName;
+	cout<<"¡ïÇëÊäÈëÎļþÃû:(¿ÉÒÔ¼ÓÀ©Õ¹Ãû!Èç.txt)";
+	cin>>FileName;
+	if(FileName.find (".")>FileName.length())
+	 {
+	    FileName=FileName+".txt";
+	 }
+		strcpy(file,FileName.c_str());
+		ifstream fin(file);
+		int index;
+	if(!fin)
+	 {
+		cout<<"ÎļþдÈëʧ°Ü!Çë¼ì²éÄúµÄÎļþÃû£¡"<<endl;
+		return ;
+	  }
+	else
+	{
+		PetList.clear ();
+		while(!fin.eof())//ÅжÏÊÇ·ñ´¦ÓÚ½áβ
+		{
+			PetAnimals pet;
+			string str;
+			fin>>str;
+			index=str.find(":");//Òª":"ºóµÄÄÚÈÝ
+			pet.Cnumber =str.substr(index+1);//Òª":"ºóµÄÊ£ÏÂ×Ö·û´®
+			fin>>str;
+			index=str.find (":");
+			pet.Cname =str.substr(index+1);
+			fin>>str;
+			index=str.find (":");
+			pet.Cage =str.substr(index+1);
+			fin>>str;
+			index=str.find (":");
+			pet.Cweight =str.substr(index+1);
+			fin>>str;
+			index=str.find (":");
+			pet.Ctype =str.substr(index+1);
+
+			fin>>str;
+			index=str.find (":");
+			pet.Cprice=str.substr(index+1);
+			fin>>str;
+			index=str.find (":");
+			pet.Cpeople =str.substr(index+1);
+			PetList.insert(PetList.end(),pet);
+
+		}
+
+	    cout<<"   Îļþ¶ÁÈ¡³É¹¦!             "<<endl;
+	}
+	fin.close();
+}
+int main()
+{
+	PetAnimals pet;
+	int option;
+do
+ {
+	cout<<endl<<"        ¡¾»¶Ó­½øÈë³èÎï½»Ò×ϵͳ£¡¡¿"<<endl;
+	cout<<" \t©°-------------------------©´"<<endl;
+	cout<<" \t©® 1.Ìí¼Ó³èÎïµÄÐÅÏ¢        ©®"<<endl;
+	cout<<" \t©® 2.²éÕÒ³èÎïµÄÐÅÏ¢        ©®"<<endl;
+	cout<<" \t©® 3.Ð޸ijèÎïµÄÐÅÏ¢        ©®"<<endl;
+	cout<<" \t©® 4.ÏÔʾ³èÎïµÄÐÅÏ¢        ©®"<<endl;
+
+	cout<<" \t©® 5.±£´æÎļþ              ©®"<<endl;
+	cout<<" \t©® 6.¶ÁÈ¡Îļþ              ©®"<<endl;
+	cout<<" \t©® 7.Í˳öϵͳ              ©®"<<endl;
+	cout<<" \t©¸-------------------------©¼\n"<<endl;
+	cin>>option;
+ switch(option)//Ñ¡Ôñ²»Í¬º¯Êý¹¦ÄÜ
+	{
+		case 1: { pet.Insert(); break; }
+		case 2: { pet.Look(); break; }
+		case 3: { pet.Change(); break; }
+		case 4: { pet.Show(); break; }
+
+		case 5: { pet.Write(); break; }
+		case 6: { pet.Read(); break; }
+		case 7: { break ; }
+	}
+ }
+ while(option != 8);
+ return 0;
+}