Date: Tue, 13 Jan 98 16:42:02 PST
From: Noam Rotem <nrotem AT johnbryce DOT co DOT il>
Subject: Bit fields in djgpp
To: djgpp AT delorie DOT com
Message-ID: <Chameleon.980113164922.nrotem@netvision.netvision>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
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Hello,

When I use bit fields within a struct, initialize them and 
print the values, I get undefined non zero values.

For example:

struct
  {
  int x : 1;
  int y : 1;
  int z : 1;
  }Test={0,0,0};

main()
  {
  ....
  Test.x=1;
  printf("%d",Test.x);
  ...
  }

I usually get -1 as an output, or other non zero values.

I can live with non zero undefined values, but I would like 
to know the reason for the results I get. Should I declare 
bit fields as unsigned? char? something else? Should I use 
other format then "%d" for printing it?

---------------------------------------------
Noam Rotem
John Bryce Training Centre
Tel Aviv, Israel.
03-7535803
=============================================
1. Take upon yourself an impossible mission.
2. Accomplish the mission.
3. Go back to step 1.

It's the only sane answer to modern life.

---
13/01/98
16:42:02