实现客户机（CLIENT）类。定义字符型静态数据成员SeverName，保存其服务器名称；整型静态数据成员ClientNum，记录已定义的客户数量；定义静态函数ChangeSeverName()改变服务器名称。在头文件client.h中定义类，在文件client.cpp中实现，在文件test.cpp中测试这个类，观察相应的成员变量取值的变化情况。

• 代码如下:
• client.h

/**This file contains code for C++ 3rd experiment*By LZH  *//**Warnning:A static variable in a class belongs to a class and does not belong to an Object!*You cannot initialize a variable when an object is defined!*Cannot initialize with constructors! *Also, use the class name instead of the object.*/#ifndef CLIENT_H// we're here only if CLIENT_H has not yet been defined #define CLIENT_H// Definition of Sales_item class and related functions goes here#include 
     
      #include 
      
       using namespace std;class CLIENT {private:    static string ServerName;  //Keep the Name of the Sever    static int ClientNum;     //Keep the sum of the clientpublic:    CLIENT();    ~CLIENT();    static void ChangeSeverName();    void show();};#endif
      
     

• client.cpp

#include"client.h"CLIENT::CLIENT() {    cout<<"This is the Dafault Constructor!!";    ClientNum++;}void CLIENT:: ChangeSeverName(){    cout << "Please enter the name of new server:";    cin >> ServerName;}   //Change the Name of the servervoid CLIENT::show(){    cout << "The Server's name:" << ServerName << endl;    cout << "The number of the Clients:" << ClientNum << endl;}CLIENT::~CLIENT() {}int CLIENT::ClientNum = 0;string CLIENT::ServerName = "#@$#@$";

• test.cpp

#include"client.h"int main() {    CLIENT asp;    asp.show();    asp.ChangeSeverName();    asp.show();    return 0;}

• 测试截图