#include<iostream>              #include<string> #include<vector> using namespace std; struct phone_book{     string name;     int number;      }; vector<phone_book>phone_books;      bool accept() {         cout<<"Do you want to proceed(y or n)?\n";         char answer=0;         cin>>answer;         switch(answer){         case'y':return true;         case'n':return false;         default:             cout<<"I'll take that for a no.\n";             return false;         } } void Creat_data(){         string str;         int num;         for(;;)         {         cout<<"输入，用回车符间隔：姓名 号码\n";         cout<<"姓名:\t";  cin>>str;         cout<<"号码:\t";  cin>>num;         phone_book pb;         pb.name=str;         pb.number=num;                                                 phone_books.push_back(pb);         if(!accept())break;         }     }     void Print_books(){                  for(int i=0;i<phone_books.size();i++)             cout<<phone_books[i].name<<'\t'<<phone_books[i].number<<endl;     }     int& Search(){         string str;                  cout<<"姓名:\t";         cin>>str;         for(int i=0;i<phone_books.size();i++)             if(phone_books[i].name==str) return phone_books[i].number;                          /*phone_book pb;             pb.name=str;             pb.number=0;                              phone_books.push_back(pb);             return phone_books[order].number;*/ }    int ShowMainMenu(){            //显示菜单栏     int c;     cout<<"请选择：首次使用，建议先选择1\n";     cout<<"1:Enter data\n2:print data\n3:search data\n0:quit"<<endl;     cin>>c;cin.get();     return c; } void main(){     for(;;){              int choice;         choice=ShowMainMenu();         switch(choice){         case 1:Creat_data();break;         case 2:Print_books();break;         case 3:for(;;){               cout<<Search()<<endl;                if(!accept())break;                }break;         case 0:exit(1);         }     }          return; } 很简单的一个电话卡程序，准备在看完The C++ programming languge后再添加 一个处理异常的函数及输入输出文件（目前我的编译器无法处理流的重载运算符），然后就是添加删除数据诸如之类完善功能的接口；当然作为实验，也会进行名字空间域的处理，另外看看标准库有没关于这方面的有用的程序；

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