IP地址类

问题及代码：

/*
 *copyright(c) 2014,烟台大学计算机学院
 *All rights reserved
 *文件名称：test.cpp
 *作者：杨昊
 *版本：v6.0
 *时间；2016年4月10日

 *
 *问题描述：Ip地址类

 *输入描述：无
 *程序输出：
*/

#include<iostream>
 using namespace std;
 class IP
 {
 private:
     union
     {
         struct
         {
             unsigned char seg0;
             unsigned char seg1;
             unsigned char seg2;
             unsigned char seg3;
         };
         unsigned int address;
     };
 public:
     IP(int =0,int=0,int=0,int=0);
     void showIP();
    bool sameSubnet(const IP &ip, const IP &mark);
     char whatKind();
 };
 IP::IP(int a,int b,int c,int d)
 {
     seg0=a;
     seg1=b;
     seg2=c;
     seg3=d;
 }


 //
bool IP::sameSubnet(const IP &ip, const IP &mark)
 {

     unsigned int i1, i2;
     i1=address&mark.address;
     i2=ip.address&mark.address;
     return (i1==i2);
 }


 ///////////////////////////
    void IP:: showIP()
    {
        int a=seg0;
        int b=seg1;
         int c=seg2;
         int d=seg3;
         cout<<a<<"."<<b<<"."<<c<<"."<<d<<endl;
    }


 char  IP ::whatKind()
     {
         if(seg0<128)
             return 'A';
         else if(seg0<192)
             return 'B';
          else if(seg0<224)
             return 'C';
         else if(seg0<240)
             return 'D';
         else
             return 'E';
     }
 int main()
 {


     IP ip1(202,194,116,97),ip2(202,194,119,102),mark(255,255,248,0);
     cout<<"ip1:";
     ip1.showIP();
     cout<<"ip2:";
     ip2.showIP();
      if(ip1.sameSubnet(ip2,mark))
          cout<<"两个IP在同一子网"<<endl;
     else
            cout<<"两个IP不在同一子网"<<endl;
     cout<<"ip1属于"<<ip1.whatKind()<<"类网络"<<endl;
 }