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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 <iostream>
#include <string>
using namespace std;

class CLIENT {
private:
    static string ServerName;  //Keep the Name of the Sever
    static int ClientNum;     //Keep the sum of the client
public:
    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 server
void 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