On Fri, 5 Apr 2002, Mike Mansheim wrote:

> Because I'm not a C expert, but this got me to look at it (even though
> I only have a Herbert Schildt book to look at).  I didn't see a way to
> access the other members of the union other than using an array, which
> makes the dot references cumbersome.  So I used #defines to make those
> look better, and ended up with:

<snip>

Try this:

#include <stdio.h>

union lo_hi {
  unsigned int i;
  struct {
    unsigned char l;
    unsigned char h;
  } b;
};

typedef union lo_hi lo_hi;

#define LO_BYTE(x) ( ((lo_hi)(x)).b.l)
#define HI_BYTE(x) ( ((lo_hi)(x)).b.h)

unsigned int  evt_length;


int
main(int argc, char **argv)
{


  evt_length = 0x1234;

  printf(" int 0x%02x, low byte 0x%02x, high byte  0x%02x\n",
         evt_length,
         LO_BYTE(evt_length),
         HI_BYTE(evt_length));

  return 0;
}


Scott

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