C++实现链表版本通讯录

#include <iostream>
#include <string>
using namespace std;
class Address;
 
class Contact{
private:
 string name;
 string sex;
 string tel;
 string QQ;
 string address;
 string addition;
 Contact *next;
public:
 Contact();
 friend class Address; 
 
};
Contact::Contact()
{
 next = NULL;
}
class Address{
public:
 Address();
 ~Address();
 int show();
 void insert();
 void delete_per();
 void display();
 void search();
 void update(); 
private:
 Contact *head;
};
Address::Address()
{
 head = new Contact;
 if(head == NULL)
 {
 cout<<"fail create"<<endl;
 }
}
Address::~Address()
{
 delete head;
}
int Address::show()  //主菜单函数
{
 int choice = 0 ;
 cout<<"tttt**************************"<<endl;
 cout<<"tttt* 通讯录c++简易版本 *"<<endl;
 cout<<"tttt**************************"<<endl;
 cout<<"tttt* 1、添加 2、删除  *"<<endl;
 cout<<"tttt**************************"<<endl;
 cout<<"tttt* 3、查看 4、搜索  *"<<endl;
 cout<<"tttt**************************"<<endl;
 cout<<"tttt* 5、更新 6、退出  *"<<endl;
 cout<<"tttt**************************"<<endl;
 cout<<"tttt请输入选择：";
 cin>>choice;
 while(!(choice >= 1&&choice <= 6))
 {
 while(getchar()!='n');
 cout<<"输入有误，请重新输入！";
 cin>>choice;
 }
 return choice;
 
}
void Address::insert() //添加联系人
{
 Contact *p = head;
 char relay = 0;
 while(p->next != NULL)
 {
 p = p->next;
 }
 Contact *person = new Contact;
 cout<<"请输入姓名：";
 cin>>person->name;
 cout<<"请输入性别：";
 cin>>person->sex;
 cout<<"请输入电话：";
 cin>>person->tel;
 cout<<"请输入QQ：";
 cin>>person->QQ;
 cout<<"请输入住址：";
 cin>>person->address;
 cout<<"请输入备注：";
 cin>>person->addition;
 p->next = person;
 person->next = NULL;
 cout<<"n添加成功，是否继续添加？（y/n）";
 cin>>relay;
 while(!(relay == 'y'||relay == 'Y'||relay == 'N'||relay == 'n'))
 {
 cout<<"输入错误，请重新输入（y/n）：";
 cin>>relay;
 }
 if(relay == 'y'||relay == 'y')
 {
 system("clear");
 insert();
 }
}
void Address::delete_per() //删除联系人
{
 string m_name;
 Contact *p = head;
 Contact *pre = head;
 int flag = 0;
 cout<<"请输入你要删除的联系人姓名！";
 cin>>m_name;
 while(p->next != NULL)
 {
 pre = p;
 p = p->next;
 if(p->name == m_name)
 {
 pre->next = p->next;
 delete p;
 p = NULL;
 flag = 1;
 break;
 }
 }
 if(flag == 1)
 {
 cout<<"删除成功！"<<endl;
 }
 else
 {
 cout<<"您删除的联系人不存在，删除失败！"<<endl;
 }
}
 
void Address::display() //查看联系人 
{
 Contact *p = head;
 while(p->next != NULL)
 {
 p = p->next;
 cout<<endl<<"======================================="<<endl;
 cout<<"姓名："<<p->name<<endl;
 cout<<"性别："<<p->sex<<endl;
 cout<<"电话："<<p->tel<<endl;
 cout<<"QQ："<<p->QQ<<endl;
 cout<<"地址："<<p->address<<endl;
 cout<<"备注："<<p->addition<<endl; 
 }
 
}
void Address::search() //搜索联系人
{
 string m_name;
 Contact *p = head;
 int flag = 0;
 cout<<"请输入你要搜索的联系人姓名:";
 cin>>m_name;
 while(p->next != NULL)
 {
 p = p->next;
 if(p->name == m_name)
 {
 cout<<endl<<"======================================="<<endl;
 cout<<"姓名："<<p->name<<endl;
 cout<<"性别："<<p->sex<<endl;
 cout<<"电话："<<p->tel<<endl;
 cout<<"QQ："<<p->QQ<<endl;
 cout<<"地址："<<p->address<<endl;
 cout<<"备注："<<p->addition<<endl; 
 flag = 1;
 }
 }
 if(flag == 1)
 {
 cout<<"n查询成功！"<<endl;
 }
 else
 {
 cout<<"您查询的联系人不存在，删除失败！"<<endl;
 }
}
void Address::update() //修改联系人
{
 Contact *p = head;
 string m_name;
 int flag = 0;
 
 cout<<"请输入你要更新的姓名：";
 cin>>m_name;
 while(p->next != NULL)
 {
 p = p->next;
 if(p->name == m_name)
 {
 cout<<"请更新性别：";
 cin>>p->sex;
 cout<<"请更新电话：";
 cin>>p->tel;
 cout<<"请更新QQ：";
 cin>>p->QQ;
 cout<<"请更新住址：";
 cin>>p->address;
 cout<<"请更新备注：";
 cin>>p->addition;
 flag = 1;
 break;
 }
 }
 if(flag == 1)
 {
 cout<<"n更新成功"<<endl;
 }
 else
 {
 cout<<"查无此人，更新失败！"<<endl;
 }
}
 
int main()
{
 Address *person = new Address;
 int choice = 0;
 while(1)
 {
 system("clear");
 choice = person->show();
 switch(choice)
 {
 case 1:
 {
 system("clear");
 person->insert();
 break;
 }
 case 2:
 {
 system("clear");
 person->delete_per();
 break;
 }
 case 3:
 {
 system("clear");
 person->display();
 break;
 }
 case 4:
 {
 system("clear");
 person->search();
 break;
 }
 case 5:
 {
 system("clear");
 person->update();
 break;
 }
 case 6:
 {
 exit(0);
 }
 }
 cout<<"nn按任意键返回.....";
 getchar();
 getchar();
 }
 return 0;
}