ネットワークプログラミングにおけるバイトシーケンス変換(linux下)

#include <stdio.h>

int main(void)
{
        unsigned int i ,num=0xab127980;
        unsigned char * pc;

        printf("nums address is %p , and it's value is 0x%x

",&num,num);
        pc = (unsigned char *)&num;
        for(i = 0 ; i < 4 ; i++)
        {
                printf("%p:0x%x

",pc,(unsigned int)*pc);
                pc++;
        }

        unsigned short port;
        port = 0x6789;
        printf("port number in host byteorder is 0x%x
",port);
        printf("port number in network byteorder is 0x%x
",htons(port));
}

[root@rac2 ~]# ./byteorder 
nums address is 0xbfe78be0 , and it's value is 0xab127980

0xbfe78be0:0x80

0xbfe78be1:0x79

0xbfe78be2:0x12

0xbfe78be3:0xab

port number in host byteorder is 0x6789
port number in network byteorder is 0x8967