通过IP地址前缀码判断ip地址类型

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

char assert_ip(unsigned long ip)
{
if(!(ip>>31^0x0))
return 'A';
if(!(ip>>30^0x2))
return 'B';
if(!(ip>>29^0x6))
return 'C';
if(!(ip>>28^0xe))
return 'D';
if(!(ip>>27^0xf))
return 'E';
}

int main(int argc,char **argv)
{
unsigned long ip = inet_addr(argv[1]);
printf("%x\n",ip);
printf("%c\n",assert_ip(htonl(ip)));

return 0;
}