htonl大小端输出

#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
  struct in_addr inaddr;
  unsigned int addr;
   if(argc!=2)
    {
      fprintf(stderr,"usage:%s <hex number>\n",argv[0]);
      exit(0);
    }
  sscanf(argv[1],"%x",&addr);
  int i;
  for(i=0;i<4;++i)
    printf("addr=%x,value=%u\n",((unsigned char*)&addr)+i,((unsigned char*)&addr)[i]);
  inaddr.s_addr=htonl(addr);
  for(i=0;i<4;++i)
    printf("addr=%x,value=%u\n",((unsigned char*)&inaddr.s_addr)+i,((unsigned char*)&inaddr.s_addr)[i]);
  printf("%s\n",inet_ntoa(inaddr));
 
  exit(0);
}