// 字符c的16進制值是0x63，字符o的16進制值是0x6f，
 // 字符n的16進制值是0x6e
 int what = 'conn';
 printf("The address of what is 0x%x /n", &what);
 printf("what 0x%x /n", what);
 if (what == 0x636f6e6e) {
  printf("what is 0x636f6e6e /n");
 }
 char *p = "conn";
 printf("p points to [%s] /n", p);
 while (*p != 0) {
     printf("%x", *p);
     p++;
 }