An IP address is 32-bit long. IP addresses are classified into A, B, C, D, and E classes, as shown in the figure below.
Please determine the class of an input IP address and obtain the corresponding IP address information according to the input 32-bit IP address.
For IP addresses of A, B, and C classes, the network number and host number are required. For class D addresses, the multicast address is required. Class E addresses are reserved for future use and do not require the network number, host number, or multicast address.
#include <stdio.h>
#include <bitset>
using std::bitset;
/*IP地址类别*/
typedef enum
{
IP_ADDR_TYPE_A, /* A类IP地址*/
IP_ADDR_TYPE_B, /* B类IP地址*/
IP_ADDR_TYPE_C, /* C类IP地址*/
IP_ADDR_TYPE_D, /* D类IP地址*/
IP_ADDR_TYPE_E /* E类IP地址*/
}IP_ADDR_TYPE;
typedef struct
{
int nNetworkNo; /* 网络号*/
int nHostNo; /* 主机号*/
}IpComposeStru;
typedef struct
{
int nType; /*IP地址类型*/
union
{
IpComposeStru stCompose; /*IP地址子信息*/
int nMultiBoardNo; /*多播组号*/
}IpSubsetInfo;
}IpAddressInfoStru;
/***************************************************************************
Description
IP地址长32bit,可分为A/B/C/D/E 5类地址。不同五类地址格式定义见题目描述中的附图。
请根据输入的32bit IP地址,判断IP地址的类别,并获得对应的IP地址信息。
其中A/B/C类地址,需要获得网络号和主机号。D类地址需要获得多播组号。E类地址不涉及。
Prototype
int GetIpAddressInfo(unsigned int unIpAddr, IpAddressInfoStru* pAddrInfo)
Input Param
unsigned int unIpAddr: Ip 地址
Output Param
IpAddressInfoStru* pAddrInfo: IP地址信息的结果。IpAddressInfoStru参加定义
其中:nType 为地址类别,请按枚举IP_ADDR_TYPE返回。
stCompose 为网络号和主机号的结构定义。在A/B/C类地址的时候需要返回。
nMultiBoardNo 为多播组号。在D类地址的时候需要返回。
Return Value
int
-1: 失败
0: 成功
****************************************************************************/
int GetIpAddressInfo(unsigned int unIpAddr, IpAddressInfoStru* pAddrInfo)
{
/*在这里实现功能*/
if (pAddrInfo == NULL)
{
return -1;
}
bitset<32> bitIpAddr = 0;
bitIpAddr = unIpAddr;
if (!bitIpAddr.test(31))
{
pAddrInfo->nType = IP_ADDR_TYPE_A;
bitset<7> bitNetworkNo;
for (int i = 0; i < 7; i++)
{
bitNetworkNo[i] = bitIpAddr[24 + i];
}
bitset<24> bitHostNo;
for (int i = 0; i < 24; i++)
{
bitHostNo[i] = bitIpAddr[i];
}
pAddrInfo->IpSubsetInfo.stCompose.nNetworkNo = bitNetworkNo.to_ulong();
pAddrInfo->IpSubsetInfo.stCompose.nHostNo = bitHostNo.to_ulong();
return 0;
}
else if (!bitIpAddr.test(30))
{
pAddrInfo->nType = IP_ADDR_TYPE_B;
bitset<14> bitNetworkNo;
for (int i = 0; i < 14; i++)
{
bitNetworkNo[i] = bitIpAddr[16 + i];
}
bitset<16> bitHostNo;
for (int i = 0; i < 16; i++)
{
bitHostNo[i] = bitIpAddr[i];
}
pAddrInfo->IpSubsetInfo.stCompose.nNetworkNo = bitNetworkNo.to_ulong();
pAddrInfo->IpSubsetInfo.stCompose.nHostNo = bitHostNo.to_ulong();
return 0;
}
else if (!bitIpAddr.test(29))
{
pAddrInfo->nType = IP_ADDR_TYPE_C;
bitset<21> bitNetworkNo;
for (int i = 0; i < 21; i++)
{
bitNetworkNo[i] = bitIpAddr[8 + i];
}
bitset<8> bitHostNo;
for (int i = 0; i < 8; i++)
{
bitHostNo[i] = bitIpAddr[i];
}
pAddrInfo->IpSubsetInfo.stCompose.nNetworkNo = bitNetworkNo.to_ulong();
pAddrInfo->IpSubsetInfo.stCompose.nHostNo = bitHostNo.to_ulong();
return 0;
}
else if (!bitIpAddr.test(28))
{
pAddrInfo->nType = IP_ADDR_TYPE_D;
bitset<28> bitMultiBoardNo;
for (int i = 0; i < 28; i++)
{
bitMultiBoardNo[i] = bitIpAddr[i];
}
pAddrInfo->IpSubsetInfo.nMultiBoardNo = bitMultiBoardNo.to_ulong();
return 0;
}
else if (!bitIpAddr.test(27))
{
pAddrInfo->nType = IP_ADDR_TYPE_E;
return 0;
}
}
原文地址:http://blog.csdn.net/usstmes318/article/details/37562063