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real world example of union in c

what can be the real world example of unions used in c
Oct 13 '06 #1
1 6932
Banfa
9,065 Expert Mod 8TB
The structure used to hold socket addresses (used on at least Windows and Linux)

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  1. struct   in_addr {
  2.     union   {
  3.         struct{
  4.             unsigned  char   s_b1,
  5.                              s_b2,
  6.                              s_b3,
  7.                              s_b4;
  8.         }  S_un_b;
  9.         struct  {
  10.             unsigned  short  s_w1,
  11.                              s_w2;
  12.         }  S_un_w;
  13.         unsigned long  S_addr;
  14.     } S_un;
  15. };
  16.  
  17. struct sockaddr_in{
  18.     short            sin_family;
  19.     unsigned short   sin_port;
  20.     struct   in_addr sin_addr;
  21.     char             sin_zero[8];
  22. };
  23.  
Oct 13 '06 #2

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