Go4Expert - Help with gethostbyname

Here's a simple program that uses gethostbyname

Code:

#include<stdio.h>

#include<stdlib.h>

#include<sys/socket.h>

#include<sys/types.h>

#include<netinet/in.h>

#include<error.h>

#include<strings.h>

#include<unistd.h>

#include<arpa/inet.h>

#include<netdb.h>         //struct hostent



int main()



{

char s[INET_ADDRSTRLEN];    //Buffer to store the ip

char **ptr;                  

char str[100];       //Name of host on which lookup has to be performed

struct hostent *hptr;                   

printf("Enter the string :");//Enter the name of host

gets(str);

printf("\n");

if((hptr=gethostbyname(str))==NULL) //Get host information

{

printf("Error in host name :");      //Error message 

exit(1);

}

printf("host officail name %s",hptr->h_name); //Print host officail name

printf("\n\n\n");

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

{

printf("Aliases : %s\n",*ptr); //Print Alias name of the host

}

printf("\n");

for(ptr=hptr->h_addr_list;*ptr!=NULL;ptr++)  //Print all ip address use by host

{

printf("Adress list %s\n",inet_ntop(AF_INET,ptr,s,sizeof(s)));

}







}

Here's the output
----------------------------------------------
./a.out
Enter the string :yahoo.com

host officail name yahoo.com

Adress list 8.65.120.8
Adress list 16.65.120.8
Adress list 24.65.120.8
Adress list 32.65.120.8
Adress list 40.65.120.8
--------------------------------------------------------------------
./a.out
Enter the string :www.yahoo.com

host officail name any-fp.wa1.b.yahoo.com

Aliases : www.yahoo.com
Aliases : fp.wg1.b.yahoo.com

Adress list 96.145.50.8
Adress list 104.145.50.8
-------------------------------------------------------------------------------
I just want to know why the result differ when i give yahoo.com and www.yahoo.com.Also every time I run it even though giving the same site as input i get a list of different IP address list.Why is so.
thanx