通过IP地址前缀码判断ip地址类型

#include 
#include 
#include 
#include 
#include 

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;
}