#include <sys/socket.h>

#include <stdio.h>

#include <netdb.h>

int main(int argc, char **argv)

{

    char   *ptr, **pptr;

    struct hostent *hptr;

    char   str[];

    ptr = argv[];

    hptr = gethostbyname(ptr);

    if(NULL == hptr)

    {

        printf(" gethostbyname error\n");

        return ;

    }

    printf("hostname:%s\n", hptr->h_name);

    for(pptr = hptr->h_aliases; *pptr != NULL; pptr++)

        printf(" pptr:%s\n",*pptr);

    switch(hptr->h_addrtype)

    {

        case AF_INET:

        case AF_INET6:

            pptr=hptr->h_addr_list;

            for(; *pptr!=NULL; pptr++)

            {

                inet_ntop(hptr->h_addrtype, *pptr, str, sizeof(str));

                printf("address: %s\n", str);

            }

        break;

    }

    return ;

}