IP地址转换整型（算法练习）

// ipTrans.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <windows.h>
typedef union
{
  unsigned char data[4];
  unsigned int ip;
}IP;
unsigned int TransIP(char *pstrIp)
{
  IP ipstr = {0};
  unsigned char temdata[3] = {0};
  int i = 0, k = 0, point = 0, t = 0;
  while(pstrIp[i] != '\0'){
    if(pstrIp[i] != '.')
    {             
       if(point > 0)
       {
         ipstr.data[k++] = (temdata[0] - '0')*100 + (temdata[1] - '0')*10 +(temdata[2] - '0');
         point = 0;
         t = 0;
       }
       temdata[t++] = pstrIp[i];      
    }
    else
    {
      point++;
    }
    i++;
  }
  ipstr.data[k] = (temdata[0] - '0')*100 + (temdata[1] - '0')*10 +(temdata[2] - '0');
  return ipstr.ip;
}
int _tmain(int argc, _TCHAR* argv[])
{
  char *ipstr = "169.168.1.1";
  unsigned int ip = TransIP(ipstr);
  printf("%s转换为整数为%u", ipstr,ip);
  system("pause");
  return 0;
}