C++양 방향 링크 간단 한 주소록 실현

#include<iostream>
#include<fstream>
#include <stdlib.h>
#include<string>
using namespace std;


typedef struct Directory   
{
 string Name;
 string Mobile;    
 string Wechatnumber;  
 string STREET;    
 string CITY;    
 string EIP;     
 string STATE;    

 struct Directory* next;  
 struct Directory* prev;  
}Directory;

//      
Directory p0 = {"0","0","0","0","0","0","0",NULL,NULL};
Directory pn = {"0","0","0","0","0","0","0",NULL,NULL};

//     ，     
Directory *head = &p0;

//    
void enter(Directory*);
void display_list();
void printf_a();
void display_menu(Directory*);
int key_ramove(string);
void display_listfiile();
Directory* find_load(string);
Directory* load();

int main()
{
 cout<<"========================================"<<endl;
 cout<<"=             ="<<endl;
 cout<<"=          ="<<endl;
 cout<<"=          ="<<endl;
 cout<<"= 1.   2.   3.   4.      ="<<endl;
 cout<<"========================================"<<endl;

 int i = 0;        //      ，    
 string key;        //       ，        

 p0.next = &pn;       //           ，       
 pn.prev = &p0;

 while(1)
 {
  cin>>i;        //  i，         
  switch(i){       //  ，i   ，   case 
  case 1:
   load();       //         
   cout<<endl;
   cout<<"    ！！！"<<endl;
   printf_a();     
   break;
  case 2:
   cout<<"     ：";
   cin>>key;
   key_ramove(key);    //    ，          
   printf_a();      
   break;
  case 3:
   cout<<"     ：";
   cin>>key;
   display_menu(find_load(key)); //          ，find_load(key)          
   printf_a();      /
   break;
  case 4:
   display_list();     //         
   printf_a();     
   break;
  case 5:
   display_listfiile();   //           "address.txt"  
   break;
  default:
   break;
  }
 }
 return 0;
}
/**************************************************
*     ：void
*     ：      
***************************************************/
void printf_a()
{
 cout<<"----------------------------------------"<<endl;
 cout<<"- 1.   2.   3.   4.      -"<<endl;
 cout<<"- 5.  txt        -"<<endl;
 cout<<"----------------------------------------"<<endl;
}
/**************************************************
*     ：Directory*
*     ：      ，   
***************************************************/
Directory* load()
{
 Directory *p = new Directory;   //          
 enter(p);        

 p->next = head->next;     //p                 
 head->next = p;       //             p
 p->prev = head;       //p                
 p->next->prev = p;
 head = p;        //     p


 return p;        
}
/**************************************************
*     ：void
*     ：      
*     ：       10 
***************************************************/
Directory* find_load(string key_name)  
{
 Directory *p;
 p = &pn;
 for(p; p->prev != NULL ;p = p->prev)
 {
  if(p->Name == key_name )
  {
   return p;
  }
 }
 return NULL;
}
/**************************************************
*     ：void
*     ：      
*     ：      15 
***************************************************/
int key_ramove(string key_name)
{
 Directory *p;       //          
 p = &pn;        
 for(p; p->prev != NULL;p = p->prev) 
 {
  if(p->Name == key_name )   
  {
   head = pn.prev;     
   p->prev->next = p->next;  //p          p    
   p->next->prev = p->prev;  //p          p    
   free(p);      //  p   
   return 0;      //   ，    
  }
 }
 cout<<"    ！！！！"<<endl;
 return 0;
}
/**************************************************
*     ：void
*     ：      
*     ：Directtory（        ）   ， 5 
***************************************************/
void enter(Directory *P )
{
 char jubge;      //       
 string name, mobile;

 cout<<"    ：";
 cin>>name;
 P->Name = name;     //         ，         

 cout<<"    ：";
 cin>>mobile;
 P->Mobile = mobile;    //         ，         

 cout<<"      ？（Y/N）"<<endl;
 cin>>jubge;

 if(jubge == 'y' || jubge == 'Y')
 {
  string wechatnumber;  //  
  string street;    //  
  string city;    //  
  string eip;     //  
  string state;    //  
  cout<<"  ：";
  cin>>wechatnumber;
  P->Wechatnumber = wechatnumber;

  cout<<"  ：";
  cin>>street;
  P->STREET = street;

  cout<<"  ：";
  cin>>city;
  P->CITY = city;

  cout<<"  ：";
  cin>>state;
  P->STATE = state;
 }else{       //    y        
  P->Wechatnumber = "NULL";

  P->STREET = "NULL";

  P->CITY = "NULL";

  P->STATE = "china";
 }
}
/**************************************************
*     ：void
*     ：     （     ，  ）
***************************************************/
void display_list()
{
 Directory *p; //          
 p = head;  //  p     head       
 int i = 1;  //    
 cout<<endl;
 cout<<"*******************************************"<<endl;
 cout<<"              "<<endl;
 cout<<"------------------------------------------"<<endl;
 while(p->prev != NULL)            //  ，  p     prev    NULL
 {
  cout<<" "<<i<<":  "<<p->Name<<endl;       //  p         
  cout<<"------------------------------------------"<<endl;
  p = p->prev;             //         
  i++;
 }
 cout<<"*******************************************"<<endl;
 cout<<endl;
}
void display_listfiile()
{
 Directory *p;         //          
 p = &pn;          //  p     head       
 int i = 1;          //    
 ofstream fout("address.txt");     //  address.txt  ，      

 while(p->prev != NULL)       //  ，  p     prev    NULL
 {
  fout << i <<":" << p->Name <<endl;   //           address.txt  
  fout <<" " << p->Mobile <<endl;
  fout <<" " << p->Wechatnumber <<endl;
  fout <<" " << p->STREET <<endl;
  fout <<" " << p->CITY <<endl;
  fout <<" " << p->STATE <<endl;
  fout <<endl;
  p = p->prev;        //         
  i++;
 }
 fout.close();         //     
}
/**************************************************
*      Directory
*     ：      
***************************************************/
void display_menu(Directory *P)
{
 if(P == NULL) //      P  ，        
 {
  cout<<"    ！！ "<<endl;
 }else{
 cout<<"* * * * * * * * * * * * * * * * * * * * "<<endl;
 cout<<"*   : "<<P->Name<<endl;
 cout<<"*   : "<<P->Mobile<<endl;
 cout<<"*   : "<<P->Wechatnumber<<endl;
 cout<<"*   : "<<P->STREET<<endl;
 cout<<"*   : "<<P->CITY<<endl;
 cout<<"*   :"<<P->STATE<<endl;
 cout<<"* * * * * * * * * * * * * * * * * * * * "<<endl;
 }
}